CN106941669B - Wireless communication method and P-CSCF device - Google Patents

Abstract

The application provides a wireless communication method and a P-CSCF device, the method comprises the steps that a P-CSCF device in an enterprise IMS network receives a INVITE message sent by a mobile terminal, the INVITE message contains an identification of a called second mobile terminal, the P-CSCF device routes a call to the second mobile terminal through an S-CSCF device in the enterprise IMS network under the condition that the identification of the second mobile terminal belongs to an internal identification in the enterprise IMS network, and the P-CSCF device routes the call to the second mobile terminal through the S-CSCF device in the operator IMS network under the condition that the identification of the second mobile terminal does not belong to the internal identification in the enterprise IMS network.

Description

Wireless communication method and P-CSCF device

technical field

The present application relates to the field of wireless communication, and more particularly, to a wireless communication method and a proxy call session control function (proxy call session control function, P-CSCF) device.

Background technique

A private branch exchange (private branch exchange, PBX) may also be referred to as a user-level exchange, and is generally used to complete telephone exchanges between enterprises and between the enterprise and the public telecommunication network. With the development of Internet Protocol (IP) technology, an IP PBX system is introduced on the basis of the traditional PBX system. The IP PBX system can integrate the voice communication into the company's data network, so as to establish a unified voice and data network within the enterprise.

The main advantage of the PBX/IP-PBX solution is that the intra-enterprise calls do not need to go through the public telecommunication network provided by the operator, that is, the operator does not perceive the intra-enterprise calls and does not charge any fees for such calls. However, the traditional PBX/IP-PBX system is designed for fixed terminals (such as landlines) within the enterprise, and can only meet the communication requirements of the fixed terminals within the enterprise. With the development of technology, the demand for using mobile terminals for voice communication in enterprises is becoming stronger and stronger, and the traditional PBX/IP-PBX system cannot support the voice communication requirements of mobile terminals.

SUMMARY OF THE INVENTION

The present application provides a wireless communication method and a P-CSCF device, which can implement functions similar to IP-PBX based on a wireless network.

A first aspect provides a wireless communication method, comprising: a first P-CSCF device in an enterprise IMS network receiving a first INVITE message sent by a first mobile terminal, where the first mobile terminal is the enterprise IMS network and operates The registered terminal of the enterprise IMS network, the first INVITE message contains the identifier of the called second mobile terminal; in the case that the identifier of the second mobile terminal belongs to the internal identifier in the enterprise IMS network, the first INVITE message contains the identifier of the called second mobile terminal. A P-CSCF device routes the call to the second mobile terminal through the serving call session control function S-CSCF device in the enterprise IMS network according to the first INVITE message; in the identification of the second mobile terminal In the case of not belonging to the internal identity in the enterprise IMS network, the first P-CSCF device routes the call to the first INVITE through the S-CSCF device of the operator's IMS network according to the first INVITE message. 2. Mobile terminals.

This technical solution modifies the function of the P-CSCF device (such as the first P-CSCF device above) applied to the enterprise IMS network, so that it has a "call proxy function". Specifically, if the P-CSCF device in the enterprise IMS network recognizes that the number of the called terminal (that is, the second mobile terminal) is the internal identification of the enterprise IMS network, the S-CSCF device in the enterprise IMS network routes the call to To the called terminal, the entire call process is carried out within the enterprise IMS network and will not pass through the operator's IMS network. In other words, the operator's IMS network is not aware of the call process within the enterprise IMS network, and thus will not charge corresponding fees. Further, if the number of the called terminal is IMPU, the S-CSCF device in the operator's IMS network routes the call to the called terminal, thereby realizing the mobile terminal in the enterprise IMS network and the mobile terminal in the operator's IMS network. For communication between terminals, of course, in this case, the operator's IMS network needs to be used, and the operator can charge corresponding fees according to certain rules. It can be seen from the above process that the call process between the mobile terminal inside the enterprise IMS network and between the enterprise IMS network and the operator IMS network is similar to the call process of the traditional IP-PBX system. Therefore, the embodiments of the present invention are equivalent to providing A wireless IP/PBX system based on IMS network is presented.

With reference to the first aspect, in some implementations of the first aspect, before the first P-CSCF device receives the first INVITE message sent by the first mobile terminal, the method further includes: the first P-CSCF device The CSCF device receives the first REGISTER message sent by the first mobile terminal; the first P-CSCF device registers the first mobile terminal with the operator's IMS network and the Enterprise IMS network.

This technical solution modifies the function of the P-CSCF device (such as the first P-CSCF device above) applied to the enterprise IMS network, so that it has a "proxy registration function". Specifically, after receiving the REGISTER message (also referred to as a registration message or a registration request) from the mobile terminal, the P-CSCF device in the enterprise IMS network not only registers the mobile terminal to the operator's IMS network, but also registers the mobile terminal to the operator's IMS network. To the enterprise IMS network, the mobile terminal can use the operator IMS network and the enterprise IMS network at the same time, and can roam between the enterprise IMS network and the operator IMS network.

With reference to the first aspect, in some implementations of the first aspect, the first REGISTER message is used to register with the operator's IMS network, and the first P-CSCF device, according to the first REGISTER message, Registering the first mobile terminal with the operator IMS network and the enterprise IMS network includes: the first P-CSCF device forwarding the first REGISTER message to the S- CSCF device; the first P-CSCF device receives a first response message sent by the operator's IMS network, where the first response message is used to indicate that the first mobile terminal is successfully registered in the operator's IMS network; The first P-CSCF device forwards the first response message to the first mobile terminal; after the first mobile terminal is successfully registered with the operator's IMS network, the first P-CSCF device sends the message to the first mobile terminal. The S-CSCF device of the enterprise IMS network sends a second REGISTER message; the first P-CSCF device receives a second response message sent by the S-CSCF device of the enterprise IMS network, and the second response message is used for Indicates that the first mobile terminal is successfully registered in the enterprise IMS network.

After the mobile terminal (ie the first mobile terminal) in the enterprise IMS network initiates the registration process of the operator's IMS network, the P-CSCF device (ie the first P-CSCF device) in the enterprise IMS network first registers the mobile terminal to the operator Then, the P-CSCF device triggers the "agent registration function", automatically initiates the registration process of the mobile terminal to the enterprise IMS network, and registers the mobile terminal to the enterprise IMS network. The registration process of the enterprise IMS network does not require the participation of the mobile terminal. , which simplifies the operation of the mobile terminal.

With reference to the first aspect, in some implementations of the first aspect, the IMPU carried in the second REGISTER message is the same as the IMPU carried in the first response message.

With reference to the first aspect, in some implementations of the first aspect, the IMPU carried in the first response message includes an IMPU in the SIP format, and the IMPI carried in the second REGISTER message includes the SIP format The remaining characters in the IMPU except the target character, the target character is sip:+.

The IMPI and IMPU corresponding to the second REGISTER message are directly generated based on the IMPU carried in the first response message. This implementation is simple, and there is no need to regenerate the IMPI and IMPU based on the IMSI.

With reference to the first aspect, in some implementations of the first aspect, the IMS network of the enterprise includes a first IMS network and a second IMS network, and the S-CSCF device of the enterprise IMS network is located in the first IMS network , the P-CSCF device of the first IMS network and the P-CSCF device of the second IMS network are both connected to the S-CSCF device in the first IMS network, and the first P-CSCF device is any P-CSCF device in the first IMS network and the second IMS network, and the first P-CSCF device and the first mobile terminal are located in the first IMS network and the second IMS network The same IMS network in the IMS network.

With reference to the first aspect, in some implementations of the first aspect, the first mobile terminal and the second mobile terminal are located in the same IMS network of the first IMS network and the second IMS network, The first P-CSCF device routes the call to the second mobile terminal through the S-CSCF device in the enterprise IMS network according to the first INVITE message, including: the first P-CSCF device to the second mobile terminal. The S-CSCF device in the enterprise IMS network forwards the first INVITE message; the first P-CSCF device receives the second INVITE message sent by the S-CSCF device of the enterprise IMS network, the second INVITE message The message contains the IMPU of the second mobile terminal; the first P-CSCF device routes the call to the second mobile terminal according to the IMPU of the second mobile terminal.

With reference to the first aspect, in some implementations of the first aspect, the first mobile terminal is located in the second IMS network, and the first P-CSCF device is the P-CSCF of the second IMS network device, the method further includes: receiving, by the first P-CSCF device, a third INVITE message sent by an S-CSCF device in the first IMS network, where the third INVITE message is in the first IMS network The INVITE message corresponding to the call initiated by the third mobile terminal, the third INVITE message contains the IMPU of the first mobile terminal; the first P-CSCF device according to the IMPU of the first mobile The call initiated by the third mobile terminal is routed to the first mobile terminal.

In a second aspect, a wireless communication method is provided, including: a first P-CSCF device receiving a first REGISTER message sent by a first mobile terminal, where the first P-CSCF device is a first P-CSCF device of an enterprise IMS network ; the first P-CSCF device registers the first mobile terminal with the operator IMS network and the enterprise IMS network according to the first REGISTER message.

This technical solution modifies the function of the P-CSCF device (such as the first P-CSCF device above) applied to the enterprise IMS network, so that it has a "proxy registration function". Specifically, after receiving the REGISTER message (also referred to as a registration message or a registration request) from the mobile terminal, the P-CSCF device in the enterprise IMS network not only registers the mobile terminal to the operator's IMS network, but also registers the mobile terminal to the operator's IMS network. To the enterprise IMS network, the mobile terminal can use the operator IMS network and the enterprise IMS network at the same time, and can roam between the enterprise IMS network and the operator IMS network.

With reference to the second aspect, in some implementations of the second aspect, the first REGISTER message is used to register in the operator's IMS network, and the first P-CSCF device, according to the first REGISTER message, The registration of the first mobile terminal to the operator IMS network and the enterprise IMS network includes: the first P-CSCF device forwarding the first REGISTER message to the S-CSCF device of the operator IMS network; the first P-CSCF device forwards the first REGISTER message to the S-CSCF device of the operator IMS network; - The CSCF device receives a first response message sent by the operator's IMS network, where the first response message is used to indicate that the first mobile terminal is successfully registered in the operator's IMS network; the first P-CSCF device forwarding the first response message to the first mobile terminal; after the first mobile terminal is successfully registered in the operator IMS network, the first P-CSCF device sends the S-CSCF device to the enterprise IMS network The CSCF device sends a second REGISTER message; the first P-CSCF device receives a second response message sent by the S-CSCF device of the enterprise IMS network, where the second response message is used to indicate that the first mobile terminal is in The enterprise IMS network is successfully registered.

After the mobile terminal (ie the first mobile terminal) in the enterprise IMS network initiates the registration process of the operator's IMS network, the P-CSCF device (ie the first P-CSCF device) in the enterprise IMS network first registers the mobile terminal to the operator Then, the P-CSCF device triggers the "agent registration function", automatically initiates the registration process of the mobile terminal to the enterprise IMS network, and registers the mobile terminal to the enterprise IMS network. The registration process of the enterprise IMS network does not require the participation of the mobile terminal. , which simplifies the operation of the mobile terminal.

With reference to the second aspect, in some implementations of the second aspect, the IMPU carried in the second REGISTER message is the same as the IMPU carried in the first response message.

With reference to the second aspect, in some implementations of the second aspect, the IMPU carried in the first response message includes an IMPU in the SIP format, and the IMPI carried in the second REGISTER message includes the SIP format The remaining characters in the IMPU except the target character, the target character is sip:+.

The IMPI and IMPU corresponding to the second REGISTER message are directly generated based on the IMPU carried in the first response message. This implementation is simple, and there is no need to regenerate the IMPI and IMPU based on the IMSI.

With reference to the second aspect, in some implementations of the second aspect, the IMS network of the enterprise includes a first IMS network and a second IMS network, and the S-CSCF device of the enterprise IMS network is located in the first IMS network , the P-CSCF device of the first IMS network and the P-CSCF device of the second IMS network are both connected to the S-CSCF device in the first IMS network, and the first P-CSCF device is any P-CSCF device in the first IMS network and the second IMS network, and the first P-CSCF device and the first mobile terminal belong to the first IMS network and the second IMS network The same IMS network in the IMS network.

In a third aspect, a P-CSCF device is provided, including modules for performing the methods described in the above aspects.

In a fourth aspect, a P-CSCF device is provided, including a memory and a processor, where the memory is used for storing instructions, and the processor is used for executing the instructions stored in the memory, so as to perform the methods described in the above aspects.

In a fifth aspect, a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, which, when executed on a computer, cause the computer to perform the methods described in the above aspects.

In a sixth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the methods of the above aspects.

In some implementation manners above, the mobile terminal is a UE, for example, a VoLTE terminal.

In some implementation manners above, the IMPI and IMPU carried in the second REGISTER message are generated based on the IMSI of the first mobile terminal.

In some of the above implementations, the first IMS network and the second IMS network are located in different countries.

Description of drawings

FIG. 1 is a schematic diagram of a network structure of an IMS network.

FIG. 2 is a schematic diagram of a networking manner of an enterprise IMS network provided by an embodiment of the present invention.

FIG. 3 is a schematic diagram of a networking manner of an enterprise IMS network provided by an embodiment of the present invention.

FIG. 4 is an exemplary diagram of an account opening model of a mobile terminal in an HSS of an operator's IMS network according to an embodiment of the present invention.

FIG. 5 is an exemplary diagram of an account opening model of a mobile terminal in an HSS of an enterprise IMS network according to an embodiment of the present invention.

FIG. 6 is a schematic flowchart of a wireless communication method provided by an embodiment of the present invention.

FIG. 7 is a schematic diagram of a detailed flow of step 620 in FIG. 6 .

FIG. 8 is a schematic diagram of a registration process provided by an embodiment of the present invention.

FIG. 9 is a schematic diagram of a registration process provided by another embodiment of the present invention.

FIG. 10 is a schematic diagram of a registration process provided by another embodiment of the present invention.

FIG. 11 is a schematic flowchart of a wireless communication method provided by an embodiment of the present invention.

FIG. 12 is a schematic diagram of a call flow provided by an embodiment of the present invention.

FIG. 13 is a schematic diagram of a call flow provided by another embodiment of the present invention.

FIG. 14 is a schematic diagram of a call flow provided by another embodiment of the present invention.

FIG. 15 is a schematic diagram of a call flow provided by another embodiment of the present invention.

FIG. 16 is a schematic diagram of a call flow provided by another embodiment of the present invention.

FIG. 17 is a schematic diagram of a call flow provided by another embodiment of the present invention.

FIG. 18 is a schematic structural diagram of a P-CSCF device provided by an embodiment of the present invention.

FIG. 19 is a schematic structural diagram of a P-CSCF device according to another embodiment of the present invention.

FIG. 20 is a schematic structural diagram of a P-CSCF device according to another embodiment of the present invention.

FIG. 21 is a schematic structural diagram of a P-CSCF device according to another embodiment of the present invention.

Detailed ways

The embodiment of the present invention proposes a mobile network voice communication technology suitable for an enterprise based on an IP multimedia subsystem (IP multimedia subsystem, IMS) network. For ease of understanding, the IMS network is first introduced in detail.

The IMS network is the standard of the next generation network defined by the 3rd Generation Partnership Project (3rd Partnership Generation Project, 3GPP). An IMS network is a network constructed on the basis of a session initiation protocol (Session Initiation Protocol, SIP). An IMS network may have one or more of the following capabilities: separation of multimedia service control functions and bearer functions, separation of calls and sessions, separation of applications and services, separation of services and networks, and integration of mobile network services and Internet services.

Figure 1 shows the main network elements in an IMS network. As shown in Figure 1, an IMS network can be roughly divided into a visited network (or called a visited domain) and a home network (or called a home domian), mainly including one or more of the following network elements : mobile terminal (for example, user equipment (UE)), session border controller (SBC), proxy call session control function (P-CSCF) device, query call session control Function (interrogating call session control function, I-CSCF) equipment, serving call session control function (serving call session control function, S-CSCF) equipment, home subscriber server (home subscriber server, HSS), and application server (application server, AS) . For ease of understanding, the functions of the above network elements are briefly introduced below.

The P-CSCF device is the interface point for the mobile terminal to connect to the IMS network, and is mainly used for functions such as SIP message forwarding of the mobile terminal and compression and decompression of SIP signaling messages. The P-CSCF equipment can be an independent network element, or can be integrated on the SBC. The SBC can provide functions such as network address translation (NAT) traversal, access control, and quality of service (QoS) control between the access network and the IMS core network.

The I-CSCF device is mainly used to implement the functions of routing and distributing the S-CSCF device. After receiving the service request sent by the mobile terminal, the I-CSCF device can route the service request to different S-CSCF devices.

The S-CSCF device is in the core control position in the IMS network. It is mainly responsible for the authentication and session control of the registration of the mobile terminal, and performs the call routing function between the calling terminal and the called terminal.

The AS can provide mobile terminals with services in the IMS, such as conference calling services.

The HSS is a network element in the home network for storing subscription information of the mobile terminal. The subscription information of the mobile terminal mainly includes the identity of the mobile terminal, the security context of the mobile terminal, the routing information of the mobile terminal, the service subscription information of the mobile terminal, and the like.

The IMS network can provide voice services based on the LTE network, and the voice services may also be called VoLTE (voice over LTE). VoLTE can carry voice services on LTE networks without falling back to 2G/3G networks. A mobile terminal using VoLTE can be called a VoLTE terminal, and the VoLTE terminal can access the IMS network through the LTE network, so as to realize the call function between the mobile terminals through the LTE network.

The concepts related to the IMS network are described in detail above. The IMS network is generally provided by an operator. This type of IMS network is referred to as an operator IMS network in this document. In order to implement the mobile terminal-based voice communication within the enterprise, the embodiment of the present invention first introduces the concept of the enterprise IMS network. An enterprise IMS network can be understood as an IMS network specially built for a certain enterprise, so that employees of the enterprise can use mobile terminals to perform voice communication through the enterprise IMS network.

The embodiment of the present invention does not specifically limit the application scenario of the enterprise IMS network. For example, the enterprise parks of some enterprises are far away from the urban area and are not covered by the operator's IMS network, such as enterprise parks such as mines, oil fields, logistics and warehousing. In order to meet the data and voice communication needs of employees in such enterprise campuses, enterprises can cooperate with local operators, lease part of the operators' wireless frequency bands, and deploy enterprise IMS networks in the enterprise campuses. Of course, an enterprise IMS network can also be deployed in a scenario covered by an operator's IMS network, so as to improve the convenience and security of communication between employees within the enterprise.

FIG. 2 is a schematic diagram of a networking manner of an enterprise IMS network provided by an embodiment of the present invention. As shown in FIG. 2 , an LTE network may be deployed in an enterprise campus, for example, an evolved node B (evolved node B, eNB) and an evolved packet core (evolved packet core, EPC) device and the like may be deployed. Further, the IMS network can be deployed on the basis of the LTE network, for example, network elements such as P-CSCF equipment, I/S-CSCF equipment, HSS, and AS can be deployed. The P-CSCF device in FIG. 2 is an independent network element. Alternatively, the P-CSCF device in FIG. 2 may also be an SBC supporting the P-CSCF function, and such an SBC may also be called an SBC/P-CSCF All-in-one device. After the enterprise IMS network is deployed, mobile terminals (VoLTE terminals) within the enterprise can perform voice communication based on the enterprise IMS network without going through the operator's IMS network. In other words, the operator's IMS network does not perceive the voice communication inside the enterprise IMS network and will not charge corresponding fees.

Further, the P-CSCF device of the enterprise IMS network can be connected to the I/S-CSCF device of the operator's IMS network (for example, it can be connected through an IP dedicated line), so as to realize the connection between the mobile terminal in the enterprise IMS network and the operator's IMS network. Intercommunication between mobile terminals. The communication between the enterprise IMS network and the operator's IMS network will be perceived by the operator's IMS network, and the operator can charge corresponding fees according to a predetermined policy.

Assuming that the enterprise IMS network shown in FIG. 2 is the IMS network of the enterprise headquarters, if the enterprise headquarters is located in country A, the operator IMS network shown in FIG. 2 may be the IMS network provided by the operator of country A. Further, in some embodiments, it is assumed that the enterprise also has an enterprise campus in country B, and an enterprise-level IMS network needs to be established in country B as well. Establish a transnational IMS network with the park in Country B. To ensure free communication within the enterprise, a P-CSCF device can be deployed on the IMS network of the campus in country B, and the P-CSCF device can be connected to the I/S-CSCF device in the campus in country A. In addition, in some embodiments, it is not necessary to deploy I/S-CSCF equipment, HSS, AS and other network elements in country B, and reuse the I/S-CSCF equipment, HSS, AS and other networks in the IMS network of the campus in country A. It is enough to save costs and facilitate the unified management of information such as contracting/registration of mobile terminals within the enterprise. Further, in some embodiments, the P-CSCF device of the IMS network in the campus of country B can be connected to the I/S-CSCF device of the IMS network of the operator in country B, so that the mobile terminal can connect to the IMS network of the campus of country B and the I/S-CSCF device of the operator in country B. roaming between the IMS networks of Chinese operators. It should be understood that the above is an example of an enterprise including two parks, and the two parks are located in two different countries, but the embodiment of the present invention is not limited to this. In fact, an enterprise can deploy three parks according to actual needs. Or more than 3 IMS networks, and these IMS networks can be located in the same country or in different countries. Further, it is assumed that an enterprise deploys multiple IMS networks in a country, and the multiple IMS networks may be connected to the IMS network of the same operator in the country, or may be connected to the IMS networks of different operators in the country.

It can be seen from the related descriptions in FIG. 2 and FIG. 3 that the embodiment of the present invention provides an IMS network-based communication mechanism for enterprise users. The functions implemented by this communication mechanism are similar to IP-PBX, except that the traditional IP - The PBX can only be aimed at fixed terminals, and the embodiments of the present invention can be aimed at mobile terminals in a wireless network. Therefore, the technical solutions provided in the embodiments of the present invention can be understood as a new wireless IP-PBX solution.

The possible networking modes of the enterprise IMS network are described in detail above with reference to FIG. 2 and FIG. 3 . Before using the enterprise IMS network and the operator IMS network, the employees of the enterprise need to open an account for the mobile terminal on the operator IMS network and the enterprise IMS network. After the account is opened, enterprise employees can perform IMS registration through the mobile terminal. The purpose of the IMS registration process is to store the binding relationship between the IP address of the mobile terminal and the IMPU of the mobile terminal in the IMS network, so that the IMS network can be based on the binding relationship. The relationship is located to the corresponding mobile terminal, thereby forwarding IMS traffic (eg, call traffic) to the mobile terminal. After successful registration, enterprise employees can use mobile terminals to perform voice communication within the enterprise IMS network and between the enterprise IMS network and the operator's IMS network.

The process of opening an account and registering is closely related to the identification (or identity identification) of the mobile terminal. For ease of understanding, the type of identification of the mobile terminal will be described first.

The identification of the mobile terminal includes an international mobile subscriber identification number (IMSI), a mobile subscriber ISDN/PSTN number (mobile subscriberinternational ISDN/PSTN number, MSISDN), an IP multimedia private identity (IMPI), and an IP multimedia private identity (IMPI). Public identity (IP multimedia public identity, IMPU), temporary IMPU (temporary IMPU, T-IMPU). The above ISDN stands for integrated service digital network, that is, international integrated services digital network, and PSTN stands for public switched telephone network, that is, public switched telephone network. The above identifier of the mobile terminal will be described below with reference to the description in Table 1.

Table I

As mentioned above, when an enterprise employee wishes to use the enterprise IMS network and wish to roam between the enterprise IMS network and the operator IMS network, the enterprise employee can open an account for the mobile terminal in the operator IMS network and the enterprise IMS network respectively.

FIG. 4 is an example of an account opening model of a mobile terminal in the HSS of the operator's IMS network. The account opening model records the T-IMPU, IMPI, IMPU in SIP format and IMPU in TEL format of the mobile terminal (VoLTE user). The mobile terminal can use the T-IMPU to initiate IMS registration, and carry the IMPI in the registration message for the IMS network to authenticate the mobile terminal. The authentication process may be performed in an authentication and key agreement (authentication and key agreement, AKA) manner. After the registration is completed, the mobile terminal can obtain Alias (alias) from the IMS network, that is, the IMPU in SIP format and the IMPU in TEL format, which can be used for IMS call flow and number display.

FIG. 5 is an example of an account opening model of a mobile terminal in an HSS of an enterprise IMS network. The account opening model records the IMPI of the mobile terminal, the IMPU in SIP format and the IMPU in TEL format. The IMPU of the mobile terminal in the enterprise IMS network account opening model is the same as the IMPU value of the mobile terminal in the operator's IMS network account opening model. The IMPI of the mobile terminal in the enterprise IMS network account opening model is the IMPU in the SIP format of the mobile terminal. sip:+" character. Certainly, the IMPI of the mobile terminal in the enterprise IMS network may also be the same as the IMPI of the mobile terminal in the operator's IMS network.

FIG. 6 is a schematic flowchart of a wireless communication method provided by an embodiment of the present invention. The method of Figure 6 is primarily concerned with the IMS registration process. The method of Figure 6 includes:

610. The first P-CSCF device receives the first REGISTER message sent by the first mobile terminal, where the first P-CSCF device is a P-CSCF device of the enterprise IMS network.

The mobile terminal herein may be, for example, user equipment (user equipment, UE). Further, in some embodiments, the mobile terminal herein may refer to a VoLTE terminal, that is, a terminal supporting VoLTE.

The first P-CSCF device in this document may be an independent device, or may be an SBC supporting the P-CSCF function, that is, an SBC/P-CSCF integrated device.

Before performing IMS registration, an account can be opened for the first mobile terminal in the operator IMS network and the enterprise IMS network, and the user subscription information of the first mobile terminal is stored in the HSS of the operator IMS network and the enterprise IMS network. In other words, before performing IMS registration, an account can be opened for the first mobile terminal in the operator IMS network and the enterprise IMS network, so that the first mobile terminal becomes a subscriber of the operator IMS network and the enterprise IMS network. For the specific account opening method, please refer to the above description.

In some embodiments, the first REGISTER message may be used to trigger a registration process of the first mobile terminal in the operator's IMS network.

620. The first P-CSCF device registers the first mobile terminal with the operator IMS network and the enterprise IMS network according to the first REGISTER message.

The embodiment of the present invention modifies the function of the P-CSCF device (such as the first P-CSCF device above) applied to the enterprise IMS network, so that it has a "proxy registration function". Specifically, after receiving the REGISTER message (also referred to as a registration message or a registration request) from the mobile terminal, the P-CSCF device in the enterprise IMS network not only registers the mobile terminal to the operator's IMS network, but also registers the mobile terminal to the operator's IMS network. To the enterprise IMS network, the mobile terminal can use the operator IMS network and the enterprise IMS network at the same time, and can roam between the enterprise IMS network and the operator IMS network.

Alternatively, in some embodiments, step 620 includes registering the first mobile terminal with the operator IMS network and the enterprise IMS network in response to the first REGISTER message.

This embodiment of the present invention does not specifically limit the implementation of step 620. For example, the first mobile terminal may be registered to the enterprise IMS network first, and then the first mobile terminal may be registered to the operator IMS network; for another example, the first mobile terminal may be simultaneously initiated. 1. Registration of the mobile terminal to the enterprise IMS network and the operator's IMS network; for another example, the first mobile terminal can be registered to the operator's IMS network according to the standard registration process. The mobile terminal registers with the enterprise IMS network, and this implementation is described in detail below with reference to FIG. 7 .

Optionally, in some embodiments, as shown in FIG. 7 , step 620 may include:

710. The first P-CSCF device forwards the first REGISTER message to the S-CSCF device of the operator's IMS network.

Specifically, the first REGISTER message may carry the IMPI and T-IMPU of the first mobile terminal in the operator's IMS network. For example, the T-IMPU of the first mobile terminal may be carried in the From/To header field of the first REGISTER message, and the IMPI of the first mobile terminal may be carried in the Authorization header field of the first REGISTER message. Both the IMPI and the T-IMPU can be generated based on the IMSI of the first mobile terminal. For example, the T-IMPU can be: sip:<IMSI>@ims.mnc<mnc>.mcc<mcc>.3gppnetwork.org; the IMPI can be : <IMSI>@ims.mnc<mnc>.mcc<mcc>.3gppnetwork.org.

720. The first P-CSCF device receives a first response message sent by the operator's IMS network, where the first response message is used to indicate that the first mobile terminal is successfully registered in the operator's IMS network.

The response message of the first REGISTER message may be, for example, a 200 OK message.

The response message of the first REGISTER message may include the IMPU of the first mobile terminal, including the IMPU in SIP format and the IMPU in TEL format. For example, the IMPU in SIP format is: sip:+<MSISDN>@ims.mnc<mnc>.mcc<mcc>.3gppnetwork.org; the IMPU in TEL format can be: tel:+<MSISDN>.

In some embodiments, between step 710 and step 720, an authentication process of the first mobile terminal by the operator's IMS network may also be performed. Specifically, after step 710, the first P-CSCF device may first forward the first REGISTER message to the S-CSCF device of the operator's IMS network; The CSCF device receives the 401 response message and forwards the 401 response message to the first mobile terminal. The 401 response message is used to instruct the operator IMS network to initiate an authentication challenge to the first mobile terminal; then, the first mobile terminal can perform authentication processing , and send a REGISTER message to the first P-CSCF device again, the REGISTER message may contain authentication response information; after receiving the REGISTER message, the first P-CSCF device forwards it to the S-CSCF device of the operator's IMS network ; The operator's IMS network completes the authentication and registration process of the first mobile terminal, and then executes the above step 720.

730. The first P-CSCF device forwards the first response message to the first mobile terminal to notify the operator of the first mobile terminal that the IMS network registration is successful.

740. After the first mobile terminal successfully registers with the operator's IMS network, the first P-CSCF device sends a second REGISTER message to the S-CSCF device of the enterprise IMS network.

Optionally, in some embodiments, the acquisition method of the IMPI and/or IMPU carried in the second REGISTER message may be similar to the acquisition method of the IMPI and/or IMPU carried in the first REGISTER message, that is, it may be based on the first movement Obtain the IMSI of the terminal.

Optionally, in other embodiments, the first P-CSCF device has obtained the IMPU of the first mobile terminal from the first response message, so the IMPU can be directly carried into the second REGISTER message. In addition, considering that the IMPI is similar to the IMPU in the SIP format, the IMPI in the second REGISTER message can also be obtained based on the IMPU in the SIP format. Specifically, the IMPI carried in the second REGISTER message includes the remaining characters except "sip:+" in the IMPU in the SIP format. For example, the IMPI carried in the second REGISTER message may be: <MSISDN>@ims.mnc<mnc>.mcc<mcc>.3gppnetwork.org. The embodiment of the present invention directly generates the IMPI and IMPU corresponding to the second REGISTER message based on the IMPU carried in the first response message. This implementation is simple and does not need to regenerate the IMPI and IMPU based on the IMSI.

750. The first P-CSCF device receives a second response message sent by the S-CSCF device of the enterprise IMS network, where the second response message is used to indicate that the first mobile terminal is successfully registered in the enterprise IMS network.

The response message of the second REGISTER message may be, for example, a 200 OK message.

In the embodiment of the present invention, after the mobile terminal (ie the first mobile terminal) in the enterprise IMS network initiates the registration process of the operator's IMS network, the P-CSCF device (ie the first P-CSCF device) in the enterprise IMS network first registers the The mobile terminal is registered with the operator's IMS network, and then the P-CSCF device triggers the "agent registration function", automatically initiates the registration process of the mobile terminal to the enterprise IMS network, and registers the mobile terminal in the enterprise IMS network. The registration process does not require the participation of the mobile terminal, which simplifies the operation of the mobile terminal.

Optionally, in some embodiments, the enterprise IMS network includes a first IMS network and a second IMS network, the S-CSCF device of the enterprise IMS network is located in the first IMS network, and the P-CSCF device of the first IMS network and the second IMS network are located. The P-CSCF devices in the two IMS networks are all connected to the S-CSCF devices in the first IMS network.

Specifically, referring to FIG. 3 , the first IMS network may correspond to the IMS network of the campus in country A in FIG. 3 , the second IMS network may correspond to the IMS network of the campus of country B in FIG. 3 , and the two IMS networks of the enterprise share the same The same I/S-CSCF device.

Further, the first P-CSCF device is any P-CSCF device in the first IMS network and the second IMS network, and the first P-CSCF device and the first mobile terminal belong to the first IMS network and the second IMS network in the same IMS network.

The IMS network to which the first mobile terminal belongs is the IMS network at the home of the first mobile terminal, that is, the IMS network selected when the first mobile terminal opens an account. The fact that the first P-CSCF device and the first mobile terminal belong to the same IMS network indicates that even if the first mobile terminal moves to the visited place, the registration process of the first mobile terminal will still be performed in the IMS network of its home place. Taking Figure 3 as an example, it is assumed that the first mobile terminal belongs to the IMS network of the campus of country A. If the first mobile terminal is currently located in the IMS network of the campus of country B (that is, the IMS network of the campus of country B is the IMS network of the visited place), and the first mobile terminal is located in the IMS network of the campus of country B, When the IMS network in the country park initiates the registration process, the mobility management entity (MME) in the country park area will select the home location for the first mobile terminal according to the roaming rules when the first mobile terminal is attached to the EPC. The packet data network gateway (P-GW) is used as a border gateway. Therefore, the first mobile terminal will attach to the home EPC, and then obtain the P-CSCF device of the home IMS network. After the first mobile terminal is attached to the EPC, it starts to initiate a registration process, and the subsequent registration process is the same as the registration process when the first mobile terminal is at the home location. In this way, even if the first mobile terminal roams to other IMS networks of the same enterprise, The same registration experience as in the home place can also be obtained. In other words, in the embodiment of the present invention, the IMS network of the visited place of the same enterprise is regarded as an extension of the IMS network of the home place.

The following takes the networking mode shown in FIG. 3 as an example, and with reference to FIGS. 8 to 10 , the registration process provided by the embodiment of the present invention is described in detail. FIG. 8 to FIG. 10 illustrate that the mobile terminal is a UE (for example, a VoLTE terminal), and the P-CSCF device is an SBC/P-CSCF integrated device. It should be noted that the examples in FIG. 8 to FIG. 10 are only for helping those skilled in the art to understand the embodiments of the present invention, and are not intended to limit the embodiments of the present invention to specific numerical values or specific scenarios exemplified. According to the examples shown in FIGS. 8 to 10 , those skilled in the art can obviously make various equivalent modifications or changes, and such modifications or changes also fall within the scope of the embodiments of the present invention.

FIG. 8 is a schematic diagram of a registration process provided by an embodiment of the present invention. In the embodiment of FIG. 8 , the UE belongs to the IMS network in the campus of country A, that is, the IMS network of the campus of country A is the home of the UE, and the UE is currently located in the IMS network of the campus of country A, and initiates a registration process in the IMS network of the campus of country A.

The method of Figure 8 includes:

802. The UE accesses the LTE network of the country A's campus, and sends a REGISTER message to the SBC/P-CSCF device in the IMS network of the country A's campus, so as to initiate the registration process of the operator's IMS network of the A country.

Specifically, the REGISTER message may carry the IMPI and T-IMPU of the UE. For example, the From/To header field of the REGISTER message may carry the T-IMPU of the UE, and the Authorization header field of the REGISTER message may carry the IMPI of the UE's IMS network of the operator in country A. Both the IMPI and the T-IMPU can be generated based on the IMSI of the UE. For example, the T-IMPU can be: sip:<IMSI>@ims.mnc<mnc>.mcc<mcc>.3gppnetwork.org; the IMPI can be: <IMSI> >@ims.mnc<mnc>.mcc<mcc>.3gppnetwork.org.

804. The SBC/P-CSCF device in the IMS network of the campus in country A forwards the REGISTER message to the I/S-CSCF device in the IMS network of the operator in country A.

806-808, the SBC/P-CSCF device in the campus IMS network of country A receives a 401 response message from the I/S-CSCF device of the operator's IMS network in country A, and forwards the 401 response message to the UE.

It should be noted that the 401 response message is used to indicate that the operator network of country A has initiated an authentication challenge to the UE.

810-812. After the UE performs the authentication process, it sends a REGISTER message to the SBC/P-CSCF device in the IMS network of the campus of country A again, and carries the authentication response information in the REGISTER message. The SBC in the IMS network of the campus of country A The /P-CSCF device forwards the REGISTER message to the I/S-CSCF device of the operator's IMS network in country A.

814. The country A operator's IMS network completes the authentication and registration process, and sends a 200 OK message to the SBC/P-CSCF device in the country A's campus IMS network through the I/S-CSCF device of the country A operator's IMS network.

The 200OK message can carry the IMPU in SIP format and the IMPU in TEL format of the UE. For example, the IMPU in SIP format and the IMPU in TEL format can take the following forms:

SIP format IMPU: sip:+<MSISDN>@ims.mnc<mnc>.mcc<mcc>.3gppnetwork.org;

TEL format IMPU: tel:+<MSISDN>.

816. The SBC/P-CSCF device in the IMS network of the campus in country A forwards the 200 OK message to the UE to notify the UE that the registration in the IMS network of the operator in country A is successful.

818. The SBC/P-CSCF device in the IMS network of the campus in country A triggers the proxy registration function, and sends a REGISTER message to the I/S-CSCF device in the IMS network in the campus in country A to start the registration process of the UE to the IMS network in the campus in country A .

The IMPU carried in the REGISTER message may be the same as the IMPU obtained in step 814; the IMPI carried in the REGISTER message may be the IMPU in the SIP format obtained in step 814 after removing "sip:+", and still use The IMPU in SIP format obtained in step 814 is sip:+<MSISDN>@ims.mnc<mnc>.mcc<mcc>.3gppnetwork.org as an example, the IMPI carried in step 818 can be <MSISDN>@ims. mnc<mnc>.mcc<mcc>.3gppnetwork.org.

820. The I/S-CSCF device in the IMS network of the campus in country A sends a 200 OK message to the SBC/P-CSCF device in the IMS network in the campus of country A.

The 200OK message indicates that the UE has successfully registered in the IMS network of the country A campus. After receiving the 200OK message, the SBC/P-CSCF device in the IMS network of the country A campus completes the proxy registration function, and registers the UE to the IMS network of the country A operator and the IMS network of the country A campus. Further, the SBC/P-CSCF device in the IMS network of the campus in country A can save the registration information of the UE, including the address of the S-CSCF device registered by the UE in the IMS network of the operator in the country A, the S-CSCF device registered in the IMS network of the campus in the country A. - CSCF device address, IMPU in SIP format and IMPU in TEL format, etc. The above information can be obtained from the 200 OK messages received in steps 814 and 820. Further, in some embodiments, after step 820, the SBC/P-CSCF device in the IMS network of the country A campus may no longer forward the 200OK message to the UE, thereby shielding the UE from the proxy registration process of the IMS network of the country A campus, The UE can determine that it has successfully registered according to the 200OK message received in step 816. In this way, the registration process of the UE is similar to the existing registration process, and the implementation of the UE does not need to be modified, and is compatible with the existing protocol.

FIG. 9 is a schematic diagram of a registration process provided by another embodiment of the present invention. In the embodiment of FIG. 9 , the UE belongs to the IMS network in the campus of country A, that is, the IMS network of the campus of country A is the home location of the UE, and the UE is currently located in the IMS network of the campus of country B, that is, the IMS network of the campus of country B is the visiting place of the UE, and the UE is in the The IMS network in the campus of Country B initiates the registration process. When the UE initiates the registration process on the IMS network in the campus of country B, the MME in the campus of country B will select the home packet data network gateway (P- data network gateway, P- GW) as a border gateway, therefore, the UE will attach to the home EPC, and then obtain the P-CSCF device of the home IMS network. After the UE attaches to the EPC, it starts to initiate the registration process. The subsequent registration process is the same as the registration process when the UE is in the home location (that is, it is the same as the process in Figure 8 and will not be described in detail here). In this way, even if the UE roams to the same location The IMS networks in other campuses of the enterprise can also obtain the same registration experience as in the home area. In other words, in this embodiment of the present invention, the IMS network in the visited area of the same enterprise is regarded as an extension of the home area IMS network.

FIG. 10 is a schematic diagram of a registration process provided by another embodiment of the present invention. In the embodiment of FIG. 10 , the UE belongs to the IMS network in the campus of country B, that is, the IMS network of the campus of country B is the home location of the UE, and the UE initiates a registration process in the IMS network of the campus of country B. The process in Figure 10 is similar to that in Figure 8, except that the proxy registration function of the UE is performed by the SBC/P-CSCF device in the IMS network of the campus of country B, because the IMS network of the campus of country B does not deploy the I/S-CSCF device , when the SBC/P-CSCF device in the IMS network of the campus in country B performs the proxy registration function, it needs to communicate with the I/S-CSCF device in the IMS network in the campus of the country A.

The IMS registration process according to the embodiment of the present invention is described in detail above with reference to FIGS. 6 to 10 , and the call flow according to the embodiment of the present invention is described in detail below with reference to FIGS. 11 to 17 .

FIG. 11 is a schematic flowchart of a wireless communication method provided by an embodiment of the present invention. The method of FIG. 11 focuses on the call flow of the mobile terminal. The method of Figure 11 includes:

1110. The first P-CSCF device in the IMS network receives the first INVITE message sent by the first mobile terminal, where the first mobile terminal is a registered terminal of the enterprise IMS network and the operator IMS network, and the first INVITE message contains the called first INVITE message. 2. The identification of the mobile terminal.

The first mobile terminal is a registration terminal of the enterprise IMS network and the operator IMS network, but the embodiment of the present invention does not specifically limit the registration process of the first mobile terminal. For example, any of the embodiments in FIG. 6 to FIG. 10 may be used. Register as described in the registration method.

Optionally, in some embodiments, the identifier of the second mobile terminal may also be referred to as a user identifier of the second mobile terminal.

1120. In the case that the identifier of the second mobile terminal belongs to the internal identifier in the enterprise IMS network, the first P-CSCF device routes the call to the second mobile terminal through the S-CSCF device in the enterprise IMS network according to the first INVITE message. terminal.

This embodiment of the present invention does not specifically limit the manner in which the second mobile terminal acquires the internal identifier of the enterprise IMS network. For example, in the process of registering the second mobile terminal with the enterprise IMS network, the AS in the enterprise IMS network may be the second mobile terminal. The internal identification of the enterprise is allocated, and the internal identification is added to the 200 OK message, which is sent to the second mobile terminal through the I/S-CSCF device of the enterprise IMS network.

Further, the embodiment of the present invention does not specifically limit the format of the internal identifier of the enterprise IMS network, as long as the internal identifier can be distinguished from the IMPU provided by the operator's IMS network. Specifically, compared with the enterprise IMS network, the operator's IMS network generally needs to provide services for more mobile terminals. Therefore, the IMPU of the mobile terminal in the operator's IMS network is generally longer. To distinguish, the internal identification of the enterprise IMS network can be designed to be shorter. In this case, the IMPU of the mobile terminal in the operator's IMS network may be called a long number, and the internal identification of the mobile terminal in the enterprise IMS network may be called a short number.

1130. In the case that the identity of the second mobile terminal does not belong to the internal identity in the enterprise IMS network, the first P-CSCF device routes the call to the second mobile terminal through the S-CSCF device of the operator's IMS network according to the first INVITE message. mobile terminal.

It should be understood that if the identifier of the second mobile terminal belongs to the internal identifier in the enterprise IMS network, it indicates that the call between the first mobile terminal and the second mobile terminal belongs to the internal communication of the enterprise. Therefore, the first P-CSCF device will pass the enterprise IMS The S-CSCF device in the network routes the call to the second mobile terminal. Correspondingly, if the identity of the second mobile terminal does not belong to the internal identity in the enterprise IMS network, it indicates that the call between the first mobile terminal and the second mobile terminal does not belong to the internal communication of the enterprise (the participation of the operator's IMS network is required), so , the first P-CSCF device will route the call to the second mobile terminal through the S-CSCF device in the operator's IMS network.

The embodiment of the present invention modifies the function of the P-CSCF device (such as the first P-CSCF device above) applied to the enterprise IMS network, so that it has a "call proxy function". Specifically, if the P-CSCF device in the enterprise IMS network recognizes that the number of the called terminal (that is, the second mobile terminal) is the internal identification of the enterprise IMS network, the S-CSCF device in the enterprise IMS network routes the call to To the called terminal, the entire call process is carried out within the enterprise IMS network and will not pass through the operator's IMS network. In other words, the operator's IMS network is not aware of the call process within the enterprise IMS network, and thus will not charge corresponding fees. Further, if the number of the called terminal does not belong to the internal identification in the enterprise IMS network, the S-CSCF device in the operator's IMS network will route the call to the called terminal, thereby realizing the communication between the mobile terminal in the enterprise IMS network and the enterprise IMS network. For communication between mobile terminals in the operator's IMS network, of course, in this case, the operator's IMS network needs to be used, and the operator can charge corresponding fees according to certain rules. It can be seen from the above process that the call process between the mobile terminal inside the enterprise IMS network and between the enterprise IMS network and the operator IMS network is similar to the call process of the traditional IP-PBX system. Therefore, the embodiments of the present invention are equivalent to providing A wireless IP/PBX system based on IMS network is presented.

Optionally, in some embodiments, the IMS network of the enterprise includes a first IMS network and a second IMS network, the S-CSCF device of the enterprise IMS network is located in the first IMS network, the P-CSCF device of the first IMS network and the The P-CSCF devices of the second IMS network are all connected to the S-CSCF devices in the first IMS network, the first P-CSCF device is any P-CSCF device in the first IMS network and the second IMS network, and the first P-CSCF device A P-CSCF device and the first mobile terminal are located in the same IMS network in the first IMS network and the second IMS network.

Taking FIG. 3 as an example, the first IMS network may correspond to the IMS network of the campus of country A in FIG. 3 , the second IMS network may correspond to the IMS network of the campus of country B in FIG. 3 , and the S-CSCF equipment of the enterprise IMS network. The IMS network is located in the campus of country A, and the P-CSCF devices of the IMS network of the campus of country A and the P-CSCF devices of the IMS network of the campus of country B are both connected to the S-CSCF devices of the IMS network of the campus of country A.

The above-mentioned first P-CSCF device and the first mobile terminal are located in the same IMS network in the first IMS network and the second IMS network means: during the call process, no matter whether the first mobile terminal is located in the first IMS network or the second IMS network network, the first mobile terminal will initiate a call to the P-CSCF device of the IMS network where the first mobile terminal is currently located. In contrast, during the registration process, the first mobile terminal will initiate registration with the P-CSCF device in the home IMS network of the first mobile terminal. Still taking FIG. 3 as an example, assuming that the first mobile terminal is currently located in the IMS network of the park of country A, no matter whether the first mobile terminal belongs to the IMS network of the park of country A or the IMS network of the park of country B, the first mobile terminal will send the IMS network of the park of country A to the IMS network of the park of country A. The P-CSCF device in the network initiates a call; for the same reason, assuming that the first mobile terminal is currently located in the IMS network of the campus of country B, the first mobile terminal will not be in the IMS network of the campus of country A or the IMS network of the campus of country B. It will initiate a call to the P-CSCF device in the IMS network of the country B campus.

Optionally, in some embodiments, the first mobile terminal and the second mobile terminal are located in the same IMS network in the first IMS network and the second IMS network, and step 1120 may include: the first P-CSCF device reports to the enterprise IMS The S-CSCF device in the network forwards the first INVITE message; the first P-CSCF device receives the second INVITE message sent by the S-CSCF device of the enterprise IMS network, and the second INVITE message contains the IMPU of the second mobile terminal; the first P-CSCF device receives the second INVITE message sent by the S-CSCF device of the enterprise IMS network. - The CSCF device routes the call to the second mobile terminal according to the IMPU of the second mobile terminal.

Since the first mobile terminal and the second mobile terminal are located in the same IMS network, the first P-CSCF device will not only be responsible for forwarding the call initiated by the first mobile terminal to the S-CSCF device in the enterprise IMS network, but also responsible for forwarding the call initiated by the first mobile terminal to the S-CSCF device in the enterprise IMS network. The call initiated by the mobile terminal is routed to the second mobile terminal.

It should be noted that the second INVITE message contains the IMPU of the second mobile terminal, that is to say, in this embodiment of the present invention, the enterprise IMS network converts the identifier of the second mobile terminal contained in the first INVITE message from the The internal identity of the enterprise IMS network translates the IMPU so that the second INVITE message can be routed to the second mobile terminal in the existing manner.

Taking Figure 3 as an example, assuming that both the first mobile terminal and the second mobile terminal are located in the IMS network of the campus of country A, the P-CSCF device in the IMS network of the campus of country A will first receive the INVITE message sent by the first mobile terminal, and then After the INVITE message is forwarded to the I/S-CSCF device of the IMS network in the campus of Country A, the P-CSCF device in the IMS network of the campus of Country A will receive the INVITE message returned by the I/S-CSCF device of the IMS network of the campus of Country A , at this time, the P-CSCF device in the IMS network of the campus in country A needs to route the INVITE message to the second mobile terminal. Assuming that both the first mobile terminal and the second mobile terminal are located in the IMS network of the campus of country B, the P-CSCF device in the IMS network of the campus of country B will first receive the INVITE message sent by the first mobile terminal, and then forward the INVITE message to After the I/S-CSCF device of the IMS network in the campus of country A, the P-CSCF device in the IMS network of the campus of country B will receive the INVITE message returned by the I/S-CSCF device of the IMS network of the campus of country A. The P-CSCF device in the campus IMS network needs to route the INVITE message to the second mobile terminal.

Optionally, in some embodiments, the first mobile terminal is located in the second IMS network, the first P-CSCF device is a P-CSCF device of the second IMS network, and the method in FIG. 11 may further include: the first P-CSCF device The CSCF device receives the third INVITE message sent by the S-CSCF device in the first IMS network, the third INVITE message is the INVITE message corresponding to the call initiated by the third mobile terminal in the first IMS network, and the third INVITE message contains the first INVITE message. The IMPU of the mobile terminal; the first P-CSCF device routes the call initiated by the third mobile terminal to the first mobile terminal according to the IMPU of the first mobile terminal.

Taking FIG. 3 as an example, the first IMS network may correspond to the IMS network in the campus of country A in FIG. 3 , and the second IMS network may correspond to the IMS network in the campus of country B in FIG. 3 . In this embodiment, the first P-CSCF device is a P-CSCF device in the IMS network of the campus in country B. The third mobile terminal is located in the IMS network of the campus of country A, and the first mobile terminal is located in the IMS network of the campus of country B, that is, the mobile terminal in the IMS network of the campus of country A calls the mobile terminal in the IMS network of the campus of country B, and the whole call process is in country A. The campus IMS network is completed with the cooperation of the network elements in the campus IMS network of country B, without the participation of the network elements in the operator's IMS network. In this way, the operator will not perceive any of the multiple IMS networks of the enterprise. There will be no corresponding charges for the communication process between them.

The following takes the networking mode shown in FIG. 3 as an example, and in conjunction with FIG. 12 to FIG. 17 , the call flow provided by the embodiment of the present invention is described in detail. FIG. 12 to FIG. 17 take the mobile terminal as a UE (for example, a VoLTE terminal), and the P-CSCF device as an SBC/P-CSCF integrated device (SBC/P-CSCF device for short) as an example for illustration. In the embodiments of FIGS. 12 to 17 , for the convenience of description, the internal identifier provided by the enterprise IMS network is called a short number, and the IMPU of the UE is called a long number. It should be noted that the examples in FIG. 12 to FIG. 17 are only for helping those skilled in the art to understand the embodiments of the present invention, and are not intended to limit the embodiments of the present invention to specific numerical values or specific scenarios exemplified. According to the examples shown in FIGS. 12 to 17 , those skilled in the art can obviously make various equivalent modifications or changes, and such modifications or changes also fall within the scope of the embodiments of the present invention.

FIG. 12 is a schematic diagram of a call flow provided by an embodiment of the present invention. In the embodiment of FIG. 12 , both the calling UE and the called UE belong to the IMS network in the campus of country A, that is, the IMS network of the campus in country A is the home of the calling UE and the called UE, and the calling UE and the called UE currently All are located in the IMS network of the country A park.

The method of Figure 12 includes:

1202. The calling UE dials the short number of the called UE in the IMS network of the country A campus, and sends an INVITE message to the SBC/P-CSCF device in the IMS network of the country A campus.

Specifically, the short number of the called UE may be located in the Request-URI field of the INVITE message. The P-Asserted-Indentify field and the From field of the INVITE message can respectively carry the IMPU in TEL format and the IMPU in SIP format of the calling UE.

1204. The SBC/P-CSCF device of the IMS network in the campus of country A triggers the "call proxy function", determines that the called UE is an internal UE according to the short number of the called UE carried in the INVITE message, and forwards the INVITE message to S-CSCF equipment of the IMS network in the campus of country A.

Before forwarding the INVITE message to the S-CSCF device of the IMS network in the campus of Country A, the SBC/P-CSCF device of the IMS network of the campus of Country A can use the registration information of the calling UE and the P-Asserted-Indentify of the received INVITE message. field and From field to determine whether the calling UE is a registered user of the IMS network in the park of country A, and if the calling UE is a registered user of the IMS network of the park of country A, the INVITE message is forwarded to the S of the IMS network of the park of country A. - CSCF device; otherwise, the INVITE message may be rejected.

1206. The S-CSCF device in the IMS network of the campus of country A sends the INVITE message updated by the IMS network of the campus of country A to the SBC/P-CSCF device of the IMS network of the campus of country A.

Specifically, the IMS network in the campus of country A (specifically, the AS of the IMS network in the campus of country A) updates the INVITE message, and converts the short number of the called UE in the INVITE message into the long number of the UE (ie, the IMPU of the UE). Then, the updated INVITE message is sent to the SBC/P-CSCF device in the IMS network of the campus in Country A through the S-CSCF device.

1208-1232. The SBC/P-CSCF device in the IMS network of the campus in country A routes the call to the called UE according to the long number of the UE. After the called UE rings, it sends 180RINGING (that is, a ringing message), and the called UE picks up A 200OK message is sent after the phone, and the call between the calling UE and the called UE is established successfully.

Steps 1208 to 1232 are similar to those in the prior art. For details, reference may be made to an existing IMS call flow, which will not be described in detail here.

FIG. 13 is a schematic diagram of a call flow provided by another embodiment of the present invention. In the embodiment of FIG. 13 , the calling UE belongs to the IMS network of the campus of country A, and the calling UE calls the called UE of the IMS network of the campus of country B in the IMS network of the campus of country A. The process in Figure 13 is similar to the process in Figure 12, the main difference is that since the called UE is located in the IMS network of the campus of country B, the S-CSCF device of the IMS network of the campus of country A receives the INVITE message of the IMS network of the campus of country A after receiving the INVITE message. , the subsequent INVITE message needs to be forwarded to the SBC/P-CSCF device in the IMS network of the campus in country B, so that the call is routed to the called UE through the SBC/P-CSCF device in the IMS network in the campus of the country B.

FIG. 14 is a schematic diagram of a call flow provided by another embodiment of the present invention. In the embodiment of FIG. 14 , the calling UE belongs to the IMS network of the country A campus, and the calling UE calls the called UE in the IMS network of the operator of the country A in the IMS network of the country A campus. The process in Figure 14 is similar to the process in Figure 12, the main difference is that: the Request-URI in the INVITE message sent by the calling UE is the IMPU of the called UE, and the SBC/P-CSCF device in the IMS network of the country A park according to the Request-URI - The URI is the IMPU, which forwards the INVITE message to the S-CSCF device in the operator's IMS network in country A, and the SBC/P-CSCF device in the operator's IMS network in country A routes the call to the called UE.

FIG. 15 is a schematic diagram of a call flow provided by another embodiment of the present invention. In the embodiment of FIG. 15 , the calling UE belongs to the IMS network of the operator of country A, and the calling UE calls the called UE in the IMS network of the campus of country A in the IMS network of the operator of country A. The process in Figure 15 is similar to the process in Figure 12, the main difference is that the calling UE sends an INVITE message to the S-CSCF device in the operator's IMS network in country A through the SBC/P-CSCF device in the operator's IMS network in country A. , the S-CSCF device in the IMS network of the operator in country A will forward the INVITE message to the SBC/P-CSCF device in the IMS network of the country A campus, so that the call is routed to the SBC/P-CSCF device in the IMS network of the country A campus. The called UE.

FIG. 16 is a schematic diagram of a call flow provided by another embodiment of the present invention. In the embodiment of FIG. 16 , the calling UE belongs to the campus IMS network of country A, and the calling UE calls the called UE in the IMS network of the operator of country A under the IMS network of the operator of country A. The call flow in FIG. 16 is basically the same as the existing call flow between two UEs in the same operator, and will not be described in detail here.

FIG. 17 is a schematic diagram of a call flow provided by another embodiment of the present invention. In the embodiment of FIG. 17 , the calling UE belongs to the campus IMS network of country A, and the calling UE calls the called UE in the campus IMS network of country A under the campus IMS network of country B. The call flow in Figure 17 is similar to the call flow in Figure 13, the difference is that after receiving the INVITE message, the SBC/P-CSCF device in the IMS network of the campus in Country B needs to forward the INVITE message to the IMS network of the campus in Country A. The S-CSCF equipment processes, and finally the SBC/P-CSCF equipment in the IMS network of the country A campus routes the call to the called UE.

The apparatus embodiments of the present invention are described below. Since the apparatus embodiments can execute the above methods, reference may be made to the foregoing method embodiments for the parts that are not described in detail.

FIG. 18 is a schematic structural diagram of a P-CSCF device provided by an embodiment of the present invention. The P-CSCF device 1800 of Figure 18 is the first P-CSCF device in the enterprise IMS network. The first P-CSCF device includes: a first receiving module 1810 , a first routing module 1820 and a second routing module 1830 . The first P-CSCF device can be used to perform the method described in FIG. 11 , for example, the first receiving module 1810 can be used to perform step 1110 in FIG. 11 , the first routing module 1820 can be used to perform step 1120 in FIG. 11 , the second Routing module 1830 may be used to perform step 1130 in FIG. 11 . The functions of the first receiving module 1810, the first routing module 1820 and the second routing module 1830 will be described in detail below.

The first receiving module 1810 is configured to receive a first INVITE message sent by a first mobile terminal, where the first mobile terminal is a registered terminal of the enterprise IMS network and the operator IMS network, and the first INVITE message includes the The identity of the calling second mobile terminal.

The first routing module 1820 is configured to, in the case that the identifier of the second mobile terminal belongs to the internal identifier in the enterprise IMS network, according to the first INVITE message, pass the S- The CSCF device routes the call to the second mobile terminal.

The second routing module 1830 is configured to, in the case that the identifier of the second mobile terminal does not belong to the internal identifier in the enterprise IMS network, according to the first INVITE message, through the S of the operator's IMS network. - The CSCF device routes the call to the second mobile terminal.

The embodiment of the present invention modifies the function of the P-CSCF device (such as the first P-CSCF device above) applied to the enterprise IMS network, so that it has a "call proxy function". Specifically, if the P-CSCF device in the enterprise IMS network recognizes that the number of the called terminal (that is, the second mobile terminal) is the internal identification of the enterprise IMS network, the S-CSCF device in the enterprise IMS network routes the call to To the called terminal, the entire call process is carried out within the enterprise IMS network and will not pass through the operator's IMS network. In other words, the operator's IMS network is not aware of the call process within the enterprise IMS network, and thus will not charge corresponding fees. Further, if the number of the called terminal is IMPU, the S-CSCF device in the operator's IMS network routes the call to the called terminal, thereby realizing the mobile terminal in the enterprise IMS network and the mobile terminal in the operator's IMS network. For communication between terminals, of course, in this case, the operator's IMS network needs to be used, and the operator can charge corresponding fees according to certain rules. It can be seen from the above process that the call process between the mobile terminal inside the enterprise IMS network and between the enterprise IMS network and the operator IMS network is similar to the call process of the traditional IP-PBX system. Therefore, the embodiments of the present invention are equivalent to providing A wireless IP/PBX system based on IMS network is presented.

Optionally, in some embodiments, the first P-CSCF device further includes: a second receiving module for receiving the first REGISTER message sent by the first mobile terminal; a registration module for receiving the first REGISTER message according to the The first REGISTER message registers the first mobile terminal with the operator IMS network and the enterprise IMS network.

Optionally, in some embodiments, the first REGISTER message is used to register on the operator IMS network, and the registration module is specifically configured to forward the first REGISTER message to the operator IMS network the S-CSCF device; receive a first response message sent by the operator's IMS network, where the first response message is used to indicate that the first mobile terminal is successfully registered in the operator's IMS network; The response message is forwarded to the first mobile terminal; the first mobile terminal sends a second REGISTER message to the S-CSCF device of the enterprise IMS network after the operator's IMS network is successfully registered; receives the enterprise IMS A second response message sent by the S-CSCF device of the network, where the second response message is used to indicate that the first mobile terminal is successfully registered in the enterprise IMS network.

Optionally, in some embodiments, the IMPU carried in the second REGISTER message is the same as the IMPU carried in the first response message.

Optionally, in some embodiments, the IMPU carried in the first response message includes a session initiation protocol SIP formatted IMPU, and the IMPI carried in the second REGISTER message includes the removal target in the SIP formatted IMPU. The remaining characters other than characters, the target character is sip:+.

Optionally, in some embodiments, the IMS network of the enterprise includes a first IMS network and a second IMS network, the S-CSCF device of the enterprise IMS network is located in the first IMS network, and the first IMS network is located in the first IMS network. Both the P-CSCF device of the IMS network and the P-CSCF device of the second IMS network are connected to the S-CSCF device in the first IMS network, and the first P-CSCF device is the first IMS network and any P-CSCF device in the second IMS network, and the first P-CSCF device and the first mobile terminal are located in the same IMS in the first IMS network and the second IMS network network.

Optionally, in some embodiments, the first mobile terminal and the second mobile terminal are located in the same IMS network of the first IMS network and the second IMS network, and the first routing module 1820 is specifically configured to forward the first INVITE message to the S-CSCF device in the enterprise IMS network; and receive the second INVITE message sent by the S-CSCF device of the enterprise IMS network, where the second INVITE message includes the the IMPU of the second mobile terminal; and routing the call to the second mobile terminal according to the IMPU of the second mobile terminal.

Optionally, in some embodiments, the first mobile terminal is located in the second IMS network, the first P-CSCF device is a P-CSCF device of the second IMS network, the first The P-CSCF device further includes: a third receiving module, configured to receive a third INVITE message sent by the S-CSCF device in the first IMS network, where the third INVITE message is the third INVITE message in the first IMS network Three INVITE messages corresponding to calls initiated by the mobile terminal, where the third INVITE message includes the IMPU of the first mobile terminal; a third routing module, configured to route the third mobile terminal according to the IMPU of the first mobile terminal The call initiated by the terminal is routed to the first mobile terminal.

FIG. 19 is a schematic structural diagram of a P-CSCF device according to another embodiment of the present invention. The P-CSCF device 1900 of FIG. 19 is the first P-CSCF device of the enterprise IMS network. The first P-CSCF device includes: a first receiving module 1910 and a registration module 1920. The first P-CSCF device may be configured to perform the method in FIG. 6 , for example, the first receiving module 1910 may be configured to perform step 610 in FIG. 6 , and the registration module 1920 may be configured to perform step 620 in FIG. 6 . The functions of the first receiving module 1910 and the registration module 1920 are described in detail below.

The first receiving module 1910 is configured to receive the first REGISTER message sent by the first mobile terminal, where the first P-CSCF device is the first P-CSCF device of the enterprise IMS network.

The registration module 1920 is configured to register the first mobile terminal with the operator IMS network and the enterprise IMS network according to the first REGISTER message.

The embodiment of the present invention modifies the function of the P-CSCF device (such as the first P-CSCF device above) applied to the enterprise IMS network, so that it has a "proxy registration function". Specifically, after receiving the REGISTER message (also referred to as a registration message or a registration request) from the mobile terminal, the P-CSCF device in the enterprise IMS network not only registers the mobile terminal to the operator's IMS network, but also registers the mobile terminal to the operator's IMS network. To the enterprise IMS network, the mobile terminal can use the operator IMS network and the enterprise IMS network at the same time, and can roam between the enterprise IMS network and the operator IMS network.

Optionally, in some embodiments, the first REGISTER message is used to register in the operator's IMS network, and the registration module 1920 is specifically configured to forward the first REGISTER message to the S- CSCF device; receive a first response message sent by the operator's IMS network, where the first response message is used to indicate that the first mobile terminal is successfully registered in the operator's IMS network; forward the first response message to the first mobile terminal; the first mobile terminal sends a second REGISTER message to the S-CSCF device of the enterprise IMS network after the operator's IMS network is successfully registered; receives the S-CSCF of the enterprise IMS network - A second response message sent by the CSCF device, where the second response message is used to indicate that the first mobile terminal is successfully registered in the enterprise IMS network.

Optionally, in some embodiments, the IMPU carried in the second REGISTER message is the same as the IMPU carried in the first response message.

Optionally, in some embodiments, the IMPU carried in the first response message includes a session initiation protocol SIP formatted IMPU, and the IMPI carried in the second REGISTER message includes the removal target in the SIP formatted IMPU. The remaining characters other than characters, the target character is sip:+.

Optionally, in some embodiments, the IMS network of the enterprise includes a first IMS network and a second IMS network, the S-CSCF device of the enterprise IMS network is located in the first IMS network, and the first IMS network is located in the first IMS network. Both the P-CSCF device of the IMS network and the P-CSCF device of the second IMS network are connected to the S-CSCF device in the first IMS network, and the first P-CSCF device is the first IMS network and any P-CSCF device in the second IMS network, and the first P-CSCF device and the first mobile terminal belong to the same IMS in the first IMS network and the second IMS network network.

FIG. 20 is a schematic structural diagram of a P-CSCF device according to another embodiment of the present invention. The P-CSCF device 2000 of FIG. 20 is the first P-CSCF device in the enterprise IMS network. The first P-CSCF device includes a memory 2010 and a processor 2020 . The memory 2010 is used for storing instructions, and the processor 2020 is used for executing the instructions stored in the memory 2010, so as to perform various steps or operations in the method corresponding to FIG. 11 .

Specifically, the processor 2020 is configured to perform the following operations:

receiving a first INVITE message sent by a first mobile terminal, where the first mobile terminal is a registered terminal of the enterprise IMS network and the operator's IMS network, and the first INVITE message includes the identifier of the called second mobile terminal;

In the case that the identity of the second mobile terminal belongs to the internal identity in the enterprise IMS network, according to the first INVITE message, the call is routed to the first INVITE through the S-CSCF device in the enterprise IMS network 2. mobile terminal;

In the case that the identity of the second mobile terminal does not belong to the internal identity in the enterprise IMS network, according to the first INVITE message, the S-CSCF device of the operator's IMS network routes the call to the the second mobile terminal.

The embodiment of the present invention modifies the function of the P-CSCF device (such as the first P-CSCF device above) applied to the enterprise IMS network, so that it has a "call proxy function". Specifically, if the P-CSCF device in the enterprise IMS network recognizes that the number of the called terminal (that is, the second mobile terminal) is the internal identification of the enterprise IMS network, the S-CSCF device in the enterprise IMS network routes the call to To the called terminal, the entire call process is carried out within the enterprise IMS network and will not pass through the operator's IMS network. In other words, the operator's IMS network is not aware of the call process within the enterprise IMS network, and thus will not charge corresponding fees. Further, if the number of the called terminal is IMPU, the S-CSCF device in the operator's IMS network routes the call to the called terminal, thereby realizing the mobile terminal in the enterprise IMS network and the mobile terminal in the operator's IMS network. For communication between terminals, of course, in this case, the operator's IMS network needs to be used, and the operator can charge corresponding fees according to certain rules. It can be seen from the above process that the call process between the mobile terminal inside the enterprise IMS network and between the enterprise IMS network and the operator IMS network is similar to the call process of the traditional IP-PBX system. Therefore, the embodiments of the present invention are equivalent to providing A wireless IP/PBX system based on IMS network is presented.

Optionally, in some embodiments, the processor 2020 is further configured to perform the following operations: receive a first REGISTER message sent by the first mobile terminal; The terminal registers with the operator IMS network and the enterprise IMS network.

Optionally, in some embodiments, the first REGISTER message is used to register with the operator's IMS network, and the first mobile terminal is registered with the operator according to the first REGISTER message and the enterprise IMS network, including: forwarding the first REGISTER message to the S-CSCF device of the operator IMS network; receiving a first response message sent by the operator IMS network, the first REGISTER message A response message is used to indicate that the first mobile terminal is successfully registered in the operator's IMS network; the first response message is forwarded to the first mobile terminal; the first mobile terminal is in the operator's IMS network After successful network registration, send a second REGISTER message to the S-CSCF device of the enterprise IMS network; receive a second response message sent by the S-CSCF device of the enterprise IMS network, where the second response message is used to indicate the The first mobile terminal is successfully registered in the enterprise IMS network.

Optionally, in some embodiments, the IMPU carried in the second REGISTER message is the same as the IMPU carried in the first response message.

Optionally, in some embodiments, the IMPU carried in the first response message includes an IMPU in the SIP format, and the IMPI carried in the second REGISTER message includes the IMPU in the SIP format except the target character. The remaining characters of , the target character is sip:+.

Optionally, in some embodiments, the IMS network of the enterprise includes a first IMS network and a second IMS network, the S-CSCF device of the enterprise IMS network is located in the first IMS network, and the first IMS network is located in the first IMS network. Both the P-CSCF device of the IMS network and the P-CSCF device of the second IMS network are connected to the S-CSCF device in the first IMS network, and the first P-CSCF device is the first IMS network and any P-CSCF device in the second IMS network, and the first P-CSCF device and the first mobile terminal are located in the same IMS in the first IMS network and the second IMS network network.

Optionally, in some embodiments, the first mobile terminal and the second mobile terminal are located in the same IMS network of the first IMS network and the second IMS network, and the An INVITE message, routing the call to the second mobile terminal through the S-CSCF device in the enterprise IMS network, comprising: forwarding the first INVITE message to the S-CSCF device in the enterprise IMS network; receiving The second INVITE message sent by the S-CSCF device of the enterprise IMS network, the second INVITE message contains the IMPU of the second mobile terminal; according to the IMPU of the second mobile terminal, the call is routed to the first 2. Mobile terminals.

Optionally, in some embodiments, the first mobile terminal is located in the second IMS network, the first P-CSCF device is a P-CSCF device of the second IMS network, and the processor 2020 is further configured to perform the following operations: receive a third INVITE message sent by the S-CSCF device in the first IMS network, where the third INVITE message is a call initiated by a third mobile terminal in the first IMS network The corresponding INVITE message, the third INVITE message includes the IMPU of the first mobile terminal; according to the IMPU of the first mobile terminal, the call initiated by the third mobile terminal is routed to the first mobile terminal.

FIG. 21 is a schematic structural diagram of a P-CSCF device according to another embodiment of the present invention. The P-CSCF device 2100 of FIG. 21 is the first P-CSCF device of the enterprise IMS network. The first P-CSCF device includes a memory 2110 and a processor 2120. The memory 2110 is used for storing instructions, and the processor 2120 is used for executing the instructions stored in the memory 2110, so as to perform each step or operation in the method corresponding to FIG. 6 .

Specifically, the processor 2120 is configured to perform the following operations:

receiving the first REGISTER message sent by the first mobile terminal, where the first P-CSCF device is the first P-CSCF device of the enterprise IMS network;

According to the first REGISTER message, the first mobile terminal is registered with the operator IMS network and the enterprise IMS network.

The embodiment of the present invention modifies the function of the P-CSCF device (such as the first P-CSCF device above) applied to the enterprise IMS network, so that it has a "proxy registration function". Specifically, after receiving the REGISTER message (also referred to as a registration message or a registration request) from the mobile terminal, the P-CSCF device in the enterprise IMS network not only registers the mobile terminal to the operator's IMS network, but also registers the mobile terminal to the operator's IMS network. To the enterprise IMS network, the mobile terminal can use the operator IMS network and the enterprise IMS network at the same time, and can roam between the enterprise IMS network and the operator IMS network.

Optionally, in some embodiments, the first REGISTER message is used to register with the operator's IMS network, and the first mobile terminal is registered with the operator's IMS network and according to the first REGISTER message. The enterprise IMS network includes: forwarding the first REGISTER message to the S-CSCF device of the operator's IMS network; receiving a first response message sent by the operator's IMS network, where the first response message is used to indicate The first mobile terminal is successfully registered in the operator's IMS network; the first response message is forwarded to the first mobile terminal; after the first mobile terminal is successfully registered in the operator's IMS network, the The S-CSCF device of the enterprise IMS network sends a second REGISTER message; receives a second response message sent by the S-CSCF device of the enterprise IMS network, where the second response message is used to indicate that the first mobile terminal is in The enterprise IMS network is successfully registered.

Optionally, in some embodiments, the IMPU carried in the second REGISTER message is the same as the IMPU carried in the first response message.

Optionally, in some embodiments, the IMPU carried in the first response message includes a session initiation protocol SIP formatted IMPU, and the IMPI carried in the second REGISTER message includes the removal target in the SIP formatted IMPU. The remaining characters other than characters, the target character is sip:+.

Optionally, in some embodiments, the IMS network of the enterprise includes a first IMS network and a second IMS network, the S-CSCF device of the enterprise IMS network is located in the first IMS network, and the first IMS network is located in the first IMS network. Both the P-CSCF device of the IMS network and the P-CSCF device of the second IMS network are connected to the S-CSCF device in the first IMS network, and the first P-CSCF device is the first IMS network and any P-CSCF device in the second IMS network, and the first P-CSCF device and the first mobile terminal belong to the same IMS in the first IMS network and the second IMS network network.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media. The usable media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, digital video disc (DVD)), or semiconductor media (eg, solid state disk (SSD)), etc. .

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (22)

1. A wireless communication method, comprising: The first proxy call session control function P-CSCF device in the Enterprise Internet Protocol Multimedia Subsystem IMS network receives the first INVITE message sent by the first mobile terminal, where the first mobile terminal is the enterprise IMS network and the operator IMS network the registered terminal, the first INVITE message contains the identifier of the called second mobile terminal; In the case that the identifier of the second mobile terminal belongs to the internal identifier in the enterprise IMS network, the first P-CSCF device passes the service call session in the enterprise IMS network according to the first INVITE message the control function S-CSCF device routes the call to the second mobile terminal; In the case that the identity of the second mobile terminal does not belong to the internal identity in the enterprise IMS network, the first P-CSCF device, according to the first INVITE message, passes the S- The CSCF device routes the call to the second mobile terminal. 2. The method according to claim 1, wherein before the first P-CSCF device receives the first INVITE message sent by the first mobile terminal, the method further comprises: The first P-CSCF device receives the first REGISTER message sent by the first mobile terminal; The first P-CSCF device registers the first mobile terminal with the operator IMS network and the enterprise IMS network according to the first REGISTER message. 3. The method of claim 2, wherein the first REGISTER message is used to register in the operator's IMS network, The first P-CSCF device registers the first mobile terminal with the operator IMS network and the enterprise IMS network according to the first REGISTER message, including: the first P-CSCF device forwards the first REGISTER message to the S-CSCF device of the operator's IMS network; receiving, by the first P-CSCF device, a first response message sent by the operator's IMS network, where the first response message is used to indicate that the first mobile terminal is successfully registered in the operator's IMS network; the first P-CSCF device forwards the first response message to the first mobile terminal; After the first mobile terminal is successfully registered in the operator's IMS network, the first P-CSCF device sends a second REGISTER message to the S-CSCF device of the enterprise IMS network; The first P-CSCF device receives a second response message sent by the S-CSCF device of the enterprise IMS network, where the second response message is used to indicate that the first mobile terminal is successfully registered in the enterprise IMS network. 4. The method according to claim 3, wherein the Internet Protocol Multimedia Subsystem public identifier IMPU carried in the second REGISTER message is the same as the IMPU carried in the first response message. 5. The method according to claim 3 or 4, wherein the IMPU carried in the first response message comprises an IMPU in a session initiation protocol SIP format, and the IMPI carried in the second REGISTER message comprises the SIP The remaining characters in the IMPU of the format except the target character, the target character is sip:+. 6. The method of claim 1, wherein the IMS network of the enterprise comprises a first IMS network and a second IMS network, and an S-CSCF device of the enterprise IMS network is located in the first IMS network , the P-CSCF device of the first IMS network and the P-CSCF device of the second IMS network are both connected to the S-CSCF device in the first IMS network, and the first P-CSCF device is the any P-CSCF device in the first IMS network and the second IMS network, and the first P-CSCF device and the first mobile terminal are located in the first IMS network and the second IMS The same IMS network in the network. 7. The method of claim 6, wherein the first mobile terminal and the second mobile terminal are located in the same IMS network of the first IMS network and the second IMS network, The first P-CSCF device routes the call to the second mobile terminal through the S-CSCF device in the enterprise IMS network according to the first INVITE message, including: the first P-CSCF device forwards the first INVITE message to the S-CSCF device in the enterprise IMS network; receiving, by the first P-CSCF device, a second INVITE message sent by the S-CSCF device of the enterprise IMS network, where the second INVITE message includes the IMPU of the second mobile terminal; The first P-CSCF device routes the call to the second mobile terminal according to the IMPU of the second mobile terminal. 8. The method of claim 6, wherein the first mobile terminal is located in the second IMS network, and the first P-CSCF device is a P-CSCF device of the second IMS network , the method also includes: The first P-CSCF device receives a third INVITE message sent by an S-CSCF device in the first IMS network, where the third INVITE message is a call initiated by a third mobile terminal in the first IMS network a corresponding INVITE message, wherein the third INVITE message includes the IMPU of the first mobile terminal; The first P-CSCF device routes the call initiated by the third mobile terminal to the first mobile terminal according to the IMPU of the first mobile terminal. 9. A wireless communication method, comprising: The first proxy call session control function P-CSCF device receives the first REGISTER message sent by the first mobile terminal, where the first P-CSCF device is the first P-CSCF device of the Enterprise Internet Protocol Multimedia Subsystem IMS network; The first P-CSCF device registers the first mobile terminal with the operator IMS network and the enterprise IMS network according to the first REGISTER message; The first P-CSCF device forwards the first REGISTER message to the S-CSCF device of the operator's IMS network; receiving, by the first P-CSCF device, a first response message sent by the operator's IMS network, where the first response message is used to indicate that the first mobile terminal is successfully registered in the operator's IMS network; the first P-CSCF device forwards the first response message to the first mobile terminal; After the first mobile terminal is successfully registered in the operator's IMS network, the first P-CSCF device sends a second REGISTER message to the S-CSCF device of the enterprise IMS network; The first P-CSCF device receives a second response message sent by the S-CSCF device of the enterprise IMS network, where the second response message is used to indicate that the first mobile terminal is successfully registered in the enterprise IMS network; The Internet Protocol Multimedia Subsystem public identifier IMPU carried in the second REGISTER message is the same as the IMPU carried in the first response message. 10. The method according to claim 9, wherein the IMPU carried in the first response message comprises an IMPU in Session Initiation Protocol (SIP) format, and the IMPI carried in the second REGISTER message comprises an IMPU in the SIP format. The remaining characters in the IMPU except the target character, the target character is sip:+. The method according to claim 9 or 10, wherein the IMS network of the enterprise comprises a first IMS network and a second IMS network, and an S-CSCF device of the enterprise IMS network is located in the first IMS In the network, the P-CSCF device of the first IMS network and the P-CSCF device of the second IMS network are both connected to the S-CSCF device in the first IMS network, and the first P-CSCF device It is any P-CSCF device in the first IMS network and the second IMS network, and the first P-CSCF device and the first mobile terminal belong to the first IMS network and the second IMS network. The same IMS network in two IMS networks. 12. A proxy call session control function P-CSCF device, wherein the P-CSCF device is the first P-CSCF device in the Enterprise Internet Protocol Multimedia Subsystem IMS network, The first P-CSCF device includes: A first receiving module, configured to receive a first INVITE message sent by a first mobile terminal, where the first mobile terminal is a registered terminal of the enterprise IMS network and the operator IMS network, and the first INVITE message includes the called the identity of the second mobile terminal; a first routing module, configured to control a service call session in the enterprise IMS network through the service call session control in the enterprise IMS network according to the first INVITE message when the identifier of the second mobile terminal belongs to the internal identifier in the enterprise IMS network the function S-CSCF device routes the call to the second mobile terminal; A second routing module, configured to pass the S-CSCF of the operator's IMS network according to the first INVITE message when the identifier of the second mobile terminal does not belong to the internal identifier in the enterprise IMS network The device routes the call to the second mobile terminal. 13. The P-CSCF device of claim 12, wherein the first P-CSCF device further comprises: A second receiving module, configured to receive the first REGISTER message sent by the first mobile terminal; A registration module, configured to register the first mobile terminal with the operator IMS network and the enterprise IMS network according to the first REGISTER message. 14. The P-CSCF device according to claim 13, wherein the first REGISTER message is used to register in the operator's IMS network, The registration module is specifically configured to forward the first REGISTER message to the S-CSCF device of the operator's IMS network; receive a first response message sent by the operator's IMS network, where the first response message is used for Instructing the first mobile terminal to successfully register with the operator's IMS network; forwarding the first response message to the first mobile terminal; after the first mobile terminal is successfully registered with the operator's IMS network, sending a second REGISTER message to the S-CSCF device of the enterprise IMS network; receiving a second response message sent by the S-CSCF device of the enterprise IMS network, where the second response message is used to indicate the first mobile terminal Successful registration in the enterprise IMS network. 15. The P-CSCF device according to claim 14, wherein the Internet Protocol Multimedia Subsystem public identifier IMPU carried in the second REGISTER message is the same as the IMPU carried in the first response message. 16. The P-CSCF device according to claim 14 or 15, wherein the IMPU carried in the first response message comprises an IMPU in a session initiation protocol SIP format, and the IMPI carried in the second REGISTER message comprises The remaining characters in the IMPU in the SIP format except the target character, the target character is sip:+. 17. The P-CSCF device according to claim 12, wherein the IMS network of the enterprise comprises a first IMS network and a second IMS network, and the S-CSCF device of the enterprise IMS network is located in the first IMS network In the IMS network, both the P-CSCF device of the first IMS network and the P-CSCF device of the second IMS network are connected to the S-CSCF device of the first IMS network, and the first P-CSCF device The device is any P-CSCF device in the first IMS network and the second IMS network, and the first P-CSCF device and the first mobile terminal are located in the first IMS network and the first IMS network The same IMS network in the second IMS network. 18. The P-CSCF device according to claim 17, wherein the first mobile terminal and the second mobile terminal are located in the same IMS network in the first IMS network and the second IMS network middle, The first routing module is specifically configured to forward the first INVITE message to the S-CSCF device in the enterprise IMS network; receive the second INVITE message sent by the S-CSCF device of the enterprise IMS network, the first INVITE message The second INVITE message contains the IMPU of the second mobile terminal; according to the IMPU of the second mobile terminal, the call is routed to the second mobile terminal. 19. The P-CSCF device according to claim 17, wherein the first mobile terminal is located in the second IMS network, and the first P-CSCF device is a P-CSCF device of the second IMS network -CSCF equipment, the first P-CSCF equipment further includes: A third receiving module, configured to receive a third INVITE message sent by an S-CSCF device in the first IMS network, where the third INVITE message corresponds to a call initiated by a third mobile terminal in the first IMS network the INVITE message, the third INVITE message contains the IMPU of the first mobile terminal; A third routing module, configured to route the call initiated by the third mobile terminal to the first mobile terminal according to the IMPU of the first mobile terminal. 20. A proxy call session control function P-CSCF device, wherein the P-CSCF device is the first P-CSCF device of the Enterprise Internet Protocol Multimedia Subsystem IMS network, The first P-CSCF device includes: a first receiving module, configured to receive the first REGISTER message sent by the first mobile terminal, where the first P-CSCF device is the first P-CSCF device of the Enterprise Internet Protocol Multimedia Subsystem IMS network; a registration module, configured to register the first mobile terminal with the operator IMS network and the enterprise IMS network according to the first REGISTER message; The registration module is specifically configured to forward the first REGISTER message to the S-CSCF device of the operator's IMS network; receive a first response message sent by the operator's IMS network, where the first response message is used to indicate the The first mobile terminal is successfully registered in the operator's IMS network; the first response message is forwarded to the first mobile terminal; after the first mobile terminal is successfully registered in the operator's IMS network, the The S-CSCF device of the enterprise IMS network sends a second REGISTER message; and receives a second response message sent by the S-CSCF device of the enterprise IMS network, where the second response message is used to indicate that the first mobile terminal is in the The enterprise IMS network registration is successful; The Internet Protocol Multimedia Subsystem public identifier IMPU carried in the second REGISTER message is the same as the IMPU carried in the first response message. 21. The P-CSCF device according to claim 20, wherein the IMPU carried in the first response message comprises an IMPU in SIP format, and the IMPI carried in the second REGISTER message comprises the The remaining characters in the IMPU in the SIP format except the target character, where the target character is sip:+. 22. The P-CSCF device according to claim 20 or 21, wherein the IMS network of the enterprise comprises a first IMS network and a second IMS network, and the S-CSCF device of the enterprise IMS network is located in the In the first IMS network, both the P-CSCF device of the first IMS network and the P-CSCF device of the second IMS network are connected to the S-CSCF device of the first IMS network, and the first P-CSCF device is connected to the S-CSCF device of the first IMS network. - The CSCF device is any P-CSCF device in the first IMS network and the second IMS network, and the first P-CSCF device and the first mobile terminal belong to the first IMS network and the same IMS network in the second IMS network.

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