WO2007059711A1 - A method, apparatus and system for transmitting the digital subscriber signaling - Google Patents

Abstract

A method, apparatus and system for transmitting the digital subscriber signaling, in which the said method is applied to the packet core network using SIP as the call control signaling, comprises: the subscriber adaptation node of SIP is used for providing the SIP signaling adaptation function which the ISDN terminal accesses the packet network using SIP as the core network call control signaling; the control unit of the ISDN service is used for providing the ISDN service control function, which includes the following steps: between the control unit for the ISDN service and the subscriber adaptation node of SIP, using the SIP message encapsulating the digital subscriber signaling information, it completes the information interaction corresponding to ISDN to implement the ISDN service and to achieve the purpose of inheriting the ISDN service in the packet network.

Description

 06 003186 A method, device and system for transmitting digital subscriber signaling

 This application claims priority to Chinese Patent Application No. 200510101939.8, entitled "A System and Method for Transmitting Digital User Signaling", filed on November 28, 2005, the entire contents of which is incorporated by reference. In this application. Technical field

 The present invention relates to the field of communications technologies, and in particular, to an ISDN service implementation of a packet core network, and in particular, to a method, apparatus, and system for transmitting digital subscriber signaling. Background technique

 The ISDN (Integral Service Digital Network) network provides an end-to-end digital connection based on the provision of a digital telephone network to support a wide range of services, including voice services and non-voice services, to provide users with a A limited, standard user-network interface. Supports 2B + D, 30B + D, nB + D standard interfaces at the user access switching system. The B channel is a 64 kbit/s rate bearer channel, and the D channel is a 16 kbit/s or 64 kbit/s rate signaling path. The ISDN network supports various integrated services including voice, data, text, and images. It also supports call forwarding, ACC (Advice of Charge), and busy call completion (CCBS, Completion of Calls to Busy Subscribers). ) and a variety of supplementary services. In order to realize these services, a large number of message interactions are required between the ISDN terminal equipment (TE, Terminal equipment) and the network. The interaction process of these messages and messages is defined as digital subscriber signaling system No. 1 (DSS 1 , Digital subscriber signaling system No ) 1) DSS 1 signaling is divided into Layer 2 signaling and Layer 3 signaling, where Layer 2 signaling uses LAPD "D channel chain 3^1 intrusion procedure", mainly for Layer 3 messages between the ISDN terminal and the network. Reliable transmission, and Layer 3 signaling is the control signaling signaling for various basic and supplementary services provided by ISDN users.

PLMN (Public Land Mobile Network) is a network for accessing mobile terminals. It is generally composed of a radio access network and a mobile switching center. Users access the mobile switching center through the radio access network, which is generally known as a mobile network. Including GSM, WCDMA, CDMA, etc. ^ In the PLMN, the network also provides basic and supplementary services similar to the ISDN network, such as voice services, call hold, etc. In order to provide these services, the mobile terminal communicates with the mobile terminal. There are similar service request and service control information between the exchange centers. These information are defined in the wireless network as the CM (Connection Management) layer protocol, which is used to control the protocol providing the support network to provide services.

 Since the user adopts the wireless access mode, these messages cannot directly reach the mobile switching center. Therefore, the information must be handled by the radio access network such as the BSS (Base Station System) or the RNS (Radio Network Subsystem) to implement the CM application layer protocol in the mobile terminal. Transmission between mobile switching centers, as in the GSM system, the CM layer protocol messages are transmitted through the DTAP protocol in the A-interface BSSAP, and in the UMTS system, through the RANAP Direct Transfer method of the Iu interface.

 The CM application layer protocol can be divided into CC (call control) protocol, SS (supplementary service control), SMS (simple short message) protocol, etc. according to the provided service functions. The CC and SS application protocols are both message format and message. The content is based on the DSS1 Layer 3 message, but it is extended on the individual information unit. In addition to the special services provided by the wireless network, the services provided by the wireless network and the processes using the CC and SS application layers are basically the same as the ISDN. Through the CC protocol and the SS protocol, the network can complete the control process for various basic and supplementary services of PLMN users.

 At present, with the continuous maturity of packet technology, traditional telecommunication networks based on circuit switching are developing towards packet-switched broadband telecommunication networks. Many operators have prepared or have established packet telecommunication networks, although users use packet communication terminals to access packet telecommunication networks. The network is the trend of future development. However, in the process of building a packet telecommunication network, operators cannot expect all subscribers to change terminal equipment uniformly. Therefore, at least the current packet telecommunication network must support the connection of traditional ISDN terminals. In this way, the packet telecommunication network must follow the traditional ISDN/PSTN (Public Switched Telephone Network) service. In the current research of relevant standards organizations, such services are collectively referred to as ISDN/PSTN Emulation Service. The research of the simulation service is still limited only to how to inherit the PSTN service in the packet network. There is no substantial progress and specific solution for the inheritance of the ISDN service.

The use of Session Initiation Protocol (SIP) as the call control signaling for the packet telecommunications core network is one of the current technological trends, such as the International Telecommunication Union-Electricity The Standards Department (ITU-T) and the European Telecommunications Standards Institute (ETSI) have developed the Next Generation Network (NGN) standard. Therefore, when an ISDN terminal accesses a packet core network using SIP as call control signaling, To implement the ISDN emulation service and ensure that the original service experience of the user remains unchanged, it is necessary to consider how the SIP protocol delivers the relevant information carried by the digital subscriber signaling. However, in the prior art, there is no proposal on how to fully transmit the digital subscriber signaling. The information method is used to implement the ISDN emulation service, so the ISDN emulation service cannot be realized.

 The DSS1 signaling includes link layer and network layer signaling. Unless otherwise specified, the DSS1 signaling mentioned below refers to network layer signaling, that is, L3 (Layer 3) layer signaling. The usual L3 layer in the wireless network includes radio resources (RR, Radio Resource), mobility management (MM, Mobile Management), and connection management CM. Unless otherwise specified, the wireless network L3 layer signaling mentioned below refers to the wireless network. The CM part of the L3 layer DSS1 signaling is the control signaling issued by the ITU-T standard organization (Q.93X series, Q.95X series) for ISDN user-network interface, and the same protocol exists in organizations such as ETSI. For specific protocols, refer to the standards published by standards organizations such as ITU-T and ETSI. The L3 layer in the wireless network is defined in the 3GPP standard, such as 3GPP TS 24.007. The peer-to-peer protocol also exists in organizations such as 3GPP2. For details, refer to 3GPP. Standards issued by relevant organizations of 3GPP2.

 In the existing standard documents, the method of transmitting call information in DSS1 messages by means of message and parameter mapping when DSS1 and SIP are intercommunicated is given. The method also provides mappings of parameters such as calling number, called number, HLC, BC and other information in the DSS1 message, such as FROM, TO, SDP in the SIP message, and some DSS1 signaling information is transmitted through these mappings. Complete the basic call.

However, due to the limitations of the existing SIP messages and the header field, the existing mapping method can only transmit limited DSS1 signaling information. Due to the variety of ISDN services, the signaling information units and parameters that need to be used when implementing these services are numerous, such as ISDN supplementary service users and networks use FACILITY (facilities) messages to interact with 95 definitions. Most of the operations are not mapped in SIP. Therefore, it is impossible to meet the requirements for supporting ISDN emulation services by simply using the SIP mapping method. Full implementation of the mapping of these parameters requires a large number of extensions to the SIP protocol, which will have a greater impact on the SIP protocol itself, and these extensions Outside of ISDN user signaling support, it is not universal.

 As shown in FIG. 1 , the service flow of the conference in the idle state of the original ISDN network is described in the prior art. For details, refer to the Q.954.1 protocol, which is not described here. In Q.954.1, the service flow of one party is added in the idle state. For details, refer to the Q.954.1 protocol, which will not be described here.

 Therefore, the current DSS1 signaling information cannot be fully mapped in the SIP message, resulting in loss of service information, and smooth ISDN emulation services cannot be implemented in service inheritance. That is, the prior art only supports individual ISDN supplementary services such as basic call and calling number display when the ISDN terminal accesses the packet core network using SIP as call control signaling, and cannot support all ISDN supplementary services, which needs to be improved. development of.

Summary of the invention

 Embodiments of the present invention provide a method, apparatus, and system for transmitting digital subscriber signaling, using SIP to transmit digital subscriber signaling information to implement an ISDN service.

 The embodiment of the invention provides a method for transmitting digital user signaling, which is applied to a packet core network using a session initiation protocol as call control signaling, and includes the following steps:

 The ISDN service information exchange is performed between the ISDN service control unit and the session initiation protocol SIP user adaptation node by using a session initiation protocol SIP message encapsulated with digital user signaling information, and the ISDN service control unit uses the ISDN service information to perform Business control, thereby implementing ISDN services;

 The SIP user adaptation node is configured to provide a SIP protocol signaling adaptation function for accessing an ISDN terminal for a packet network that uses the SIP protocol as the core network call control signaling; and the ISDN service control unit is configured to provide ISDN service control. Features.

 More suitably, the method further comprises:

 The received digital user signaling message is encapsulated in a SIP message, or the information element contained in the digital user signaling message is encapsulated.

 The embodiment of the present invention further provides a device for transmitting digital user signaling, which is applied to a packet core network that uses a session initiation protocol SIP as call control signaling, and the device includes: a first interface, configured to connect to a packet core network ;

a second interface, configured to connect to the ISD terminal device signaling path; a message receiving unit, configured to receive a first digital user signaling message or a first session initiation protocol SIP message transmitted by the first interface and the second interface;

 a message processing unit, configured to be connected to the message receiving unit, for encapsulating or mapping the first digital user signaling message content from the message receiving unit in a second session initiation protocol SIP message, or for receiving the first received message Generating a second digital user signaling message in the session initiation protocol SIP message;

 The message sending unit is connected to the message processing unit, and configured to send the second session initiation protocol SIP message or the second digital user signaling message from the message processing unit to the first interface and the second interface.

 An embodiment of the present invention provides a system for transmitting digital subscriber signaling, including a packet core network and at least one ISDN terminal, where the packet core network includes an ISDN service control unit and a media resource control unit corresponding to different ISDN terminals.

 A session initiation protocol SIP user adaptation node is disposed between the ISDN terminal and the packet core network, and the ISDN terminal is connected to the ISDN service control unit by using a SIP user adaptation node; the ISDN service control unit is configured to provide ISDN service logic. Controlling, network resource control function, and signaling interaction with another ISDN service control unit to establish a connection with the other ISDN terminal;

 The session initiation protocol user adaptation node is configured to encapsulate the DSS1 signaling message into the SIP message body to provide a signaling adaptation between the signaling protocol DSS 1 and the SIP as a protocol conversion node.

 In the technical solution for transmitting digital user signaling provided by the embodiment of the present invention, a session initiation protocol message encapsulated with digital user signaling information is completed between a control unit and a session initiation protocol user adaptation node, which are between the ISDN service and the session initiation protocol. ISDN-related information exchange enables complete ISDN terminal and ISDN service control by carrying digital user signaling messages/information elements in the SIP message body when ISDN accesses the packet core network using SIP as call control signaling The digital subscriber signaling protocol information is transmitted between the units, thereby simply implementing the ISDN service and achieving the purpose of inheriting the ISDN service in the packet network. DRAWINGS

1 is a schematic diagram of a service flow of starting a conference operation in an idle state in the prior art; 2 is a schematic diagram of a prior art business process of adding one party;

 3 is a schematic diagram of a network logical structure of a system of the present invention;

 4 is a schematic flow chart of UUS1 and HOLD implementation in an ISDN service according to an embodiment of the present invention;

 FIG. 5 is a schematic flowchart of an implementation process of starting a conference in an idle state according to an embodiment of the present invention; FIG. 6 is a schematic diagram of an operation flow of adding a party in a conference according to an embodiment of the present invention; FIG. 7 is a UUS service of a WCDMA user according to an embodiment of the present invention; Schematic diagram of the implementation process. detailed description

 The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The system, method and device for transmitting digital subscriber signaling according to the present invention, the network logical structure diagram of the packet core network using the session initiation protocol SIP as the call control signaling is as shown in FIG. 3, and is disposed between the ISDN terminal and the packet core network. The SIP user adaptation node, the ISDN terminal is connected to the ISDN service control unit in the packet core network through the SIP user adaptation node, and the ISDN service control unit implements ISDN service control and network resource control, including basic services and supplementary services. The session initiation protocol user adaptation node provides signaling adaptation between the digital subscriber signaling protocol and the session initiation protocol by means of message mapping and/or encapsulation of digital user signaling messages into the message body of the session initiation protocol.

 The ISDN service control unit provides a logical control function of an ISDN service for an ISDN terminal user accessing a packet core network. The SIP user adaptation node is a signaling processing entity of an ISDN terminal accessing a packet domain with SIP as call control signaling, and has a SIP User Adaptation (SIP UA) function, which can shield the access layer user signaling as A protocol conversion node provides translation between the DSS1 protocol and the SIP protocol.

 It should be noted that Figure 3 shows the logical connection diagram. In the actual physical link, there may be other entities between the ISDN terminal and the SIP user adaptation node.

 The ISDN service control unit provides various service logic control functions such as call control and routing connection for the registered users of the access packet core network, and provides a logical control service control unit for the ISDN service for the ISDN terminal user.

As can be seen from Figure 3, to implement the ISDN service, it is necessary to pass the original ISDN through the SIP message between the ISDN service control unit and the SIP user adaptation node of the ISDN terminal. Digital user signaling information between the network interfaces of the user, the signaling information may be a complete DSS1 Layer 3 signaling message, such as a SETUP message, a HOLD message, a FACILITY message, etc., or may be a wireless interface signaling connection management layer message. In addition, since the prior art already supports mapping of information units such as the calling number and the SIP message parameter in the DSS1 signaling message, the complete DSS1 signaling message may not be transmitted, but only the service related to the service may be transmitted. The information unit, such as UUS (User-to-User Signalling) information unit, FACILITY information unit, DISPLAY information unit, and the like.

 The method for transmitting digital subscriber signaling of the present invention is to perform ISDN service information interaction between the control unit for the ISDN service and the session initiating protocol user adaptation node by using the session initiation protocol message encapsulated with the digital user signaling information, and the ISDN service. The control unit uses the ISDN service information to perform service control, thereby implementing the ISDN service. The session initiation protocol user adaptation node is configured to provide access ISDN for the packet network that uses the session initiation protocol as the core network call control signaling. The session initiation protocol signaling adaptation function of the terminal; the control unit for the ISDN service is used to provide an ISDN service control function and a network resource control function. The following takes the DSS1 message as an example to illustrate the specific process of the method of the present invention, including the following steps.

 First, the user-initiated protocol of the serving user session initiation protocol receives the digital user signaling message, encapsulates the relevant information in the message body of the session initiation protocol message, and sends the protocol initiation protocol message to the ISDN service control unit of the served user. After the SIP user adaptation node receives the DSS1 message from the ISDN terminal, the message receiving processing unit of the SIP user adaptation node selects the message processing unit and submits the received user signaling, and the message processing unit receives the received digital user. The content of the signaling is analyzed, and the appropriate SIP message is selected, and the content included in the digital user signaling is mapped to the SIP header field or the parameter according to the prior art, and the message body of the SIP message is paired according to the local or configuration policy. The information unit in the digital subscriber signaling message or the digital subscriber signaling information is encapsulated and then transmitted to the service control unit through the message transmission processing unit.

 To encapsulate the DSS1 signaling information in the SIP message body, a new media type (Media Type) needs to be defined for the SIP message body.

 a) The media type used to deliver DSS1 Layer 3 messages:

Media type name: application Media subtype name: DS SI -Message

 Required parameters: Version

 Optional parameters: charset

 Encoding scheme: codeset

 b). The type of media used to pass the DSS1 Layer 3 information element:

 Media type name: application

 Media subtype name: DSS1-IE

 Required parameters: Version

 Optional parameters: charset

 Encoding scheme: codeset

 The parameter "version" indicates DSS1 messages issued by different organizations, such as ITU-T, ETSK ANSI, etc. The parameter "charset" indicates the definition of a set of strings, suitable for text-based message encapsulation, such as Unicode.

 The parameter "codeset" indicates that for the encapsulation type of the DSS1 message, the DSS1 message or information element may be encapsulated in binary or text (us-ascii): by the codec indication field in the media type description achieve. When encapsulating in binary mode, the SIP message body encapsulates a binary DSS1 message or information element; when encapsulating in text mode, the encapsulating entity needs to parse the binary DSS1 message or information element and convert it into text mode. Encapsulated in the body of the message.

 Obviously, you can define up to four different media types for different packaging: Binary coded

DSS1 message encapsulation, text-encoded DSS1 message encapsulation, binary-encoded DSS1 information unit encapsulation, text-encoded DSS1 information unit encapsulation, in practical applications, one of the encapsulation media types is selected as needed. Of course, the encapsulation of the present invention is implemented by adding a new media type of a session initiation protocol message body, or extending an existing media type.

The method of the present invention adopts at least one encapsulation mode; when the method of the present invention adopts more than one encapsulation mode, the encapsulation manner is distinguished by setting different media types or setting different parameters of one media type. In practical applications, if the system requires more than one encapsulation mode, in addition to defining the media type of the above encapsulation mode, it may also be defined in the same media type, and the binary coding encapsulation/text coding encapsulation is distinguished by different parameters, and /or The DSS1 message encapsulation/DSS1 information unit encapsulation may define one or more media types in any combination according to requirements, wherein different encapsulation modes are distinguished by parameters.

 Secondly, the served user ISDN service control unit accepts the session initiation protocol message for service processing, and sends a session initiation protocol message encapsulated with digital user signaling information to the session initiation protocol user adaptation node or the remote network of the served user. After receiving the SIP message from the SIP user adaptation node, the ISDN service control unit analyzes the SIP and SIP message body content, performs corresponding ISDN service control processing, and sends the SIP message carrying the DSS1 related information to the served user or The SIP user of the remote user is adapted to the node or sent to the remote network, that is, the ISDN service control unit to which the remote user belongs.

 Then, the session initiation protocol user adaptation node of the service user or the remote user receives the session initiation protocol message from the ISDN service control unit, and translates the message into a digital user signaling message, and sends the message to the corresponding ISDN terminal. The SIP user adaptation node receives the SIP message from the ISDN service control unit, and the message receiving unit of the SIP user adaptation node selects an appropriate message processing unit to submit the message, and the message processing unit parses the received SIP message. If the digital user signaling message is encapsulated in the SIP message body, the digital user signaling message in the SIP message body is extracted and sent to the user terminal; for example, the digital message signaling information unit is encapsulated in the SIP message body, and the appropriate selection is based on the SIP message type. Digital user signaling message, mapping the SIP header field and parameters into information units in the digital user signaling message, and simultaneously appending the digital user signaling information unit in the SIP message body to the digital user signaling message, and then passing The message sending unit sends the message to the user terminal.

 According to the foregoing description of the method of the present invention, the interaction between the ISDN terminal and the ISDN service control unit of the DSS1 signaling can be completed, thereby implementing the original ISDN services. In the above steps of the present invention, the SIP user adaptation node may encapsulate the digital subscriber signaling message in the SIP message body, or may encapsulate one or more digital subscriber signaling information elements in the SIP message body.

The method of the invention carries a digital user signaling message through a SIP message, and the information unit can implement ISDN such as MCID, CFU, CFB, CFNR, CD, ECT, HOLD, TP, CCBS, CCNR, CO F, 3PTY, AOC, UUS, CUG, etc. These services are implemented by supplementing the delivery of messages and information units of the service. The present invention further provides an apparatus for transmitting digital user signaling, which is applied to a packet core network that uses access session initiation protocol as call control signaling, and the apparatus includes: a first interface, configured to connect to a packet core network; a second interface, configured to connect to an ISDN terminal, and a message receiving unit, configured to receive a first digital user signaling message or a first session initiation protocol message sent by the first interface and the second interface; a processing unit, configured to be connected to the message receiving unit, configured to encapsulate or map the first digital user signaling message content from the message receiving unit in a second session initiation protocol message, or to initiate from the received first session Generating a second digital user signaling message in the protocol message; the message sending unit is connected to the message processing unit, and configured to send the second session initiation protocol from the message processing unit to the first interface and the second interface Message, or second digital user signaling message.

 In the device of the present invention, the first interface is a session initiation protocol message interface that encapsulates digital user signaling information, and the second interface is a digital user signaling message interface. The digital subscriber signaling information of the first interface refers to a binary digital subscriber message or information unit or a digital subscriber signaling message or information element described in textual form. The digital subscriber signaling message interface is a digital number one user signaling network layer message interface or a wireless interface signaling connection management message interface.

 Two more general examples are given below to describe how to carry DSS1 information through SIP messages to provide ISDN services to ISDN terminal users accessing the packet core network using SIP as call control signaling.

 It should be noted that the flowchart illustrations and texts in the present invention are merely illustrative of the key techniques of the present invention, and do not represent a complete call and service control process, nor do they exhaust all possible branching processes; The digital subscriber signaling is a signaling process of the digital subscriber number one signaling network layer, and is also applicable to the wireless interface connection management layer.

 As shown in Figure 4, the implementation of the method of the present invention is illustrated by taking the implementation of the ISDN supplementary service UUS1 (User to User Signaling 1) and the call hold (HOLD) as an example. The process is explained as follows:

First, the ISDN user terminal sends a DSS1 SETUP message to the SIP user adaptation node. The calling number is 8880006 in the SETUP message, the called number is 8880008, the carrying capacity is SPEECH, the UUS1 information is carried, and the ISDN signaling received by the user adaptation node is first. Pathway DSS1 The content of the third layer message is as follows, wherein the data information of the UUS information unit of the DSS1 signaling added in the information body is embodied in an underlined form:

 08 01 01 05 04 03 80 90 a3 18 01 83 6c 09 41 a0 38 38 38 30 30 30 36 70 08 80 38 38 38 30 30 30 38 7E OA 04 38 38 38 38 38 38 38 38 38 38

 Secondly, the SIP user adaptation node takes the DSS1 according to the mapping method of the prior art.

The SETUP message is translated into a SIP INVITE message, which is added to the message body:

 Content-type: application/DSS 1 -IE; version- ITU-T; Encoding scheme 1 binary

 7E OA 04 38 38 38 38 38 38 38 38 38 38

 The content of the message body is a binary representation of the DSS1 UUS information element;

 Of course, the above content is also parsed into a textual description for encapsulation, for containing " _

OA 04 38 38 38 38 38 38 38 38 38 38" The DSS1 information element of the content, according to the definition of the DSS1 information unit structure, the binary stream 7E identifies the UUS information unit, 0A identifies the information unit length, 04 identifies the protocol identifier, and the rest is UUS data information, which can be converted into textual information by such parsing, is described below.

 Content-type: application/DSS 1 -IE; version- ITU-T; Encoding scheme = us-ascii

 UUS, pd=0f, dat=38 38 38 38 38 38 38 38 38 38

 The UUS identifies the information unit name, pd is the protocol identifier, and the dat is the UUS data information.

 The above underlined portion is the UUS information unit that adds DSS1 signaling in the information body.

 An example of the message is as follows:

 INVITE sip:8880008@ag2.example.com SIP/2.0

 Via: SIP/2.0/UDP acess.example.com

 From: sip:8880006@agl .example.com

 To: sip:8880008@ag2.example.com

 Call-ID: 12345678908888888888@example.com

CSeq: 1234 INVITE Contact: <sip:8880006@example.com>

 Content-Length: 385

 MIME- Version: 1.0

 Content-Type: application/SDP; charset=ISO- 10646 v=0

 o=audet 2890844526 2890842807 5 IN IP4 132.172.62.2 s=SDP example

 c=IN IP4 access.example.com

 t= 2873397496 2873404696

 m=audio RTP/AVT 8

 a= - b= 64kbit/s

 Content-type: application/DSS 1-IE; version: ITU-T; Encoding scheme = binary

 7E OA 04 38 38 38 38 38 38 38 38 38 38

 The ISDN service control unit receives the SIP message, analyzes the message and the in-vivo information, and determines whether the user has the UUS1 service authority according to the user subscription data. Because the UUS information unit transmits the information end-to-end, the message is transparently transmitted to the message. If the called user (that is, the remote user B of the service user A) belongs to the SIP user adaptation node, if the user has no service right, the ISDN service control unit deletes the UUS information encapsulated in the message body.

 Then, the destination SIP user adapts the node, analyzes the message content, translates the SIP INVITE message into a DSS1 SETUP message, identifies the SIP user adaptation node of the SIP message body content, analyzes the message content, and maps the INVITE message to DSS1 according to the existing method. The SETUP message identifies the SIP message body bearer information DSS1 information element, extracts and appends it to the SETUP message, and sends it to the ISDN terminal B to implement the UUS1 service.

After that, the called ISDN terminal sends a DSS1 CONNECT message to connect the call; the called SIP user adaptation node responds with a DSS1 CONNECT ACKNOWLEDGE message. The called SIP user adaptation node translates the DSS1 CONNECT message into a SIP 200 OK and sends it to the ISDN service control unit. The ISDN service control unit sends a SIPACK response. SIP 200 OK message; The ISDN service control unit sends a SIP 200 OK to the calling SIP user adaptation node, indicating that the session is established; the calling SIP user adaptation node uses the SIP ACK message for confirmation; the calling SIP user adaptation node will SIP 200 OK is translated into a DSS1 CONNECT message, which is sent to the calling ISDN terminal through the user access processing node. The calling ISDN terminal responds with the DSS1 CONNECT ACKNOWLEDGE message according to the DSS1 signaling procedure. At this point, the session has been established, see Figure 5 in Figure 4. Step -11.

 In the following, the calling ISDN terminal A of the method of the present invention sends a DSS1 HOLD message request to keep the call service; the example of the DSS1 message content is:

 08 01 01 24

 Since there is no corresponding mapping mode in the prior art, the SIP user adaptation node uses SIP.

The INFO message encapsulates the DSS1 HOLD message and sends it to the corresponding ISDN service control unit. The content added in the IKFO message body is as follows, which is a complete DSS1 HOLD message: Content-type: application/DSS 1 -Message; version= ITU- T; Encoding scheme = binary

 08 01 01 24

 The ISDN service control unit analyzes the SIP message and the message body content, determines that the ISDN HOLD service is requested by the calling party, and determines the HOLD service for the calling party according to the ISDN HOLD service normal service bearer DSS1 information, and returns according to the normal process of the ISDN HOLD service. The HOLD ACKNOWLEDGE message, the HOLD ACKNOWLEDGE message is encapsulated in the message body of the SIP 200 OK message, and the following is added to the message body:

 Content-type: application/ DSS1 -Message; version= ITU-T; Encoding scheme = binary

 08 01 81 28

 The SIP user adaptation node transparently transmits a DSS1 HOLD ACKNOWLEDGE message in the message body to the calling terminal according to the content in the SIP 200 OK message body, and the content is as follows:

 08 01 81 28

The ISDN service control unit sends a SIP INFO message carrying a DSS1 Notify message to the called SIP user adaptation node according to the HOLD service request, so as to indicate to the called party that the call is held, and the INFO message adds the following content: Content-type: application/ DS SI -Message; version= ITU-T;

Encoding scheme = binary

 08 01 01 6E 27 01 79

 When text description is used in text mode, the message body content is as follows:

 The above "6E" is the DSS1 NOTIFY message description, "27" is the DSS1 NOTIFY information unit description, "01" is the message length, and "79" is the notification descriptor, indicating the remote call hold. After the message is parsed, the SIP message body is determined. The content is:

 Content-type: application/ DSS1 -Message; version- ITU-T; Encoding scheme = us-ascii

 NOTIFY

NI, nd = 79

 Where NOTIFY identifies the message name, ΝΙ identifies the information element notify indicator, nd indicates that the notification description parameter in the information element is 79 (remote hold)

 After receiving the SIP message, the SIP user adaptation node extracts the SIP message body encapsulation information, and constructs a DSS1 NOTIFY message (indicating that the call is held) to the ISDN terminal, and the message content is as follows:

 08 01 01 6E 27 01 79

 The SIP user adaptation node uses the 200 OK message to confirm according to the protocol requirements. The ISDN service information unit controls the playback operation to the served user, and sends a SIP INVITE message to the called SIP user adaptation node, carrying the SDP to describe the media resource address. achieve.

 The called SIP user adaptation node responds to the INVITE message by using a 200 OK message according to the requirements of the SIP protocol, and redirects the voice path flow of the ISDN terminal B to the media resource, so that the called party listens to the call hold tone, and the call is already held. , complete the HOLD business.

 It can be seen from the above example of the method of the present invention that the UAS1 HOLD service and the service interworking of the ISDN are implemented by using the SSS1 signaling information in the SIP, and the existing mapping mode can be used to map and interact with the message, and there is no existing mapping. The message of the mode is directly encapsulated into different message bodies for transmission.

The following will compare the implementation of the "start conference" and "conference add one" operations of the conference call (CO F ) service in the original ISDN network, and give the method of the present invention using SIP as a call control. The implementation process of the service in the packet core network of the signaling is described. FIG. 5 and FIG. 6 are descriptions of the method of the present invention implemented in SIP as a packet core network for call control signaling.

 As shown in FIG. 5, in order to use the method of the present invention in a packet core network using SIP as call control signaling, an ISDN terminal starts a conference implementation process in an idle state, where the process includes: First, the served user ISDN terminal A follows Q.954.1 (required in 1.5.2.1) sends a DSS1 SETUP message with the start conference component, and requests to start the conference in idle state. The message content is as follows:

 08 01 01 05 04 03 80 90 a3 18 01 83 lc 0c 91 al 09 02 01 68 02 01 28 02 01 03 6c 09 41 aO 38 38 38 30 30 30 36

 Secondly, the SIP user adaptation node responds by using the DSS1 CALL PROCEEDING message; the SIP user adaptation node analyzes the content of the DSS1 message, encapsulates the DSS 1 SETUP message by using the SIP INVITE message, and sends it to the ISDN service control unit. The message example is as follows:

 INVITE sip:CONF@agl .example.com SIP/2.0

 Via: SIP/2.0/UDP acess.example.com

 From: sip:8880006@agl .example.com

 To: sip: CONF @ag 1. example . com

 Call-ID:

 Confl2345678908888888888@example.com

 CSeq: 1234 INVITE

 Contact: <sip:8880006@example.com>

 Content-Length: 462

 MIME- Version: 1.0

 Content-Type: application/SDP; charset=ISO-10646 o=audit 2890844526 2890842807 5 IN IP4

 132.172.62.2

 s=SDP example

 c=IN IP4 access.example.com

t= 2873397496 2873404696 m=audio RTP/AVT 8

 a= - b= 64kbit/s

 Content-type: application/DSS 1 -Message version: ITU-T; Encoding scheme = binary

 08 01 01 05 04 03 80 90 a3 18 01 83 lc 0c 91 al 09 02 01 68 02 01 28 02 01 03 6c 09 41 aO 38 38 38 30 30 30 36

 The ISDN service control unit carries a DSS1 CONNECT message with a "Start Conference" return result component in the SIP 200 OK message according to the "Start Conference" service logic, and adds the following content to the SIP 200 OK message:

 Content-type: application/DSS 1 -Message version= ITU-T; Encoding scheme = binary

 08 01 81 07 lc 10 91 a2 0c 02 01 60 30 08 02 01 28 30 03 02 01 01 The SIP user adaptation node uses SIP ACK for confirmation; the SIP user adaptation node is transparent according to the contents of the SIP 200 OK message body. The DSSl CONNECT message in the message body is transmitted to the calling ISDN terminal, and the contents are as follows:

 08 01 81 07 lc 10 91 a2 0c 02 01 60 30 08 02 01 28 30 03 02 01 01 The calling ISDN terminal responds with a DSSl CONNECT ACK message. FIG. 5 is a flowchart showing an implementation process in which an ISDN terminal starts a conference in an idle state in a packet core network using SIP as a call control signaling by using the method of the present invention, wherein the served user and the remote user in FIG. 5 are both ISDNs. terminal.

 The operation flow of adding one party in the conference in the method of the present invention is as shown in FIG. 6, which includes: the ISDN terminal (the served user) sends a DSS1 HOLD message, and the call reference (CR) in the message is used to start the conference using the CR; the SIP user adaptation node The SIP INFO message is used to carry the HOLD message of the DSS1 signaling, and the SIP INFO message uses the session number for starting the conference operation, and the following is added to the SIPINFO message body:

 Content-type: application/DSS 1 -Message; version= ITU-T; Encoding scheme = binary

08 01 01 24 The ISDN service parses the content of the SIP INFO message, determines the ISDN HOLD service, exchanges resources with the media control resource, and modifies the service user media stream to be unidirectional (such as establishing a two-way connection between the served user and the media resource media stream when starting the conference) At the same time, the HOLD ACK message of the DSS 1 signaling is encapsulated in the SIP 200 OK message, and the following is added to the SIP 200 OK message body:

 Content-type: application/ DSS 1 -Message; version= ITU-T; Encoding scheme = binary

 08 01 81 28

 The SIP user adaptation node parses the DSS1 message encapsulated in the SIP 200 OK message, extracts the DSS1 HOLD ACK message in the message body, and sends the message to the ISDN terminal; in steps 5 to 17 shown in FIG. The interworking process establishes a new session between the service user and the remote user. The existing process is not detailed here.

 The following description refers to the steps 18-44 shown in FIG. 6. The ISDN terminal (served user) sends a DSS1 HOLD message, where the call reference (CR) is a call reference used by the remote user to call; the SIP user The adaptation node uses the SIP INFO message to carry the HOLD message in the DSS1 signaling, and the SIP INFO message body adds the following content:

 Content-type: application/DSSl -Message; version= ITU-T; Encoding scheme = binary

 08 01 02 24

 The ISDN service control unit parses the content of the SIP INFO message body into an ISDN HOLD service request, and responds with a DSS1 HOLD ACK message according to the service flow requirement. The message is encapsulated in the content of the SIP INFO message, and responds by using the HOLD ACK message according to the HOLD service request. The message is encapsulated in a 200 OK message and sent to the SIP user adaptation node, and the power is added to the interface.

 Content-type: application/ DSS 1 -Message; version: ITU-T; Encoding scheme = binary

 08 01 82 28

The SIP user adaptation node determines that the SIP 200 OK message encapsulates the DSS 1 message, extracts the message body content and sends the message to the ISDN terminal; and the ISDN service control unit processes the HOLD service. The interworking logic sends a SIP INFO message carrying a DSS1 Notify message to the remote SIP user adaptation node. The remote SIP user adaptation node responds with a SIP 200 OK message.

 The remote SIP user adaptation node extracts the DSS1 Notify message in the SIP INFO message body and sends it to the remote user, and the service user sends a DSS 1 FACILITY message to apply for "meeting add party, operation, DSS1 message content:

 08 01 02 lc 91 al 09 02 01 68 07 01 29 02 01 01

 The SIP user adaptation node encapsulates the DSS 1 message by using a SIP INFO message, and sends the message to the ISD service control node. The INFO message adds the following content:

 Content-type: application/DSS 1 -Message; version= ITU-T; Encoding scheme = binary

 08 01 02 lc 91 al 09 02 01 68 07 01 29 02 01 01

 The ISDN service node returns to the DSS1 according to the conference call service flow requirement.

DISCONNECT message, the DISCONNECT message with the added party returns the result component, this message is encapsulated in the SIP 200 OK message, the message adds the following:

 Content-type: application/DSS 1 -Message; version= ITU-T; Encoding scheme = binary

 08 01 82 08 03 12 9e ff

 The SIP user adaptation node extracts the DISCONNECT message in the SIP 200 OK message body and sends it to the served user. The message content is as follows:

 08 01 82 08 03 12 9e ff

 The served user sends a DSS1 RELEASE message to release the local call cr2; the SIP user adaptation node responds with a DSS1 RELEASE COMPLETE message.

 The ISDN service control unit processes the service logic of the "party add one party" operation, and sends a SIP INFO message carrying the DSS 1 Notify message to the remote SIP user adaptation node to indicate the conference establishment. The content added in the INFO message is as follows:

 Content-type: application/DSS 1 -Message; version= ITU-T; Encoding scheme = binary

 08 01 01 6E 27 01 42

The SIP user adaptation node uses a SIP 200 OK message for confirmation; The distribution node extracts the DSS1 message in the SIP INFO message and sends it to the remote user.

 The ISDN service control unit sends a SIP Update message to modify the media stream to the media resource, and the ISDN service control unit interacts with the media resource control unit; the SIP user adaptation node uses the SIP 200 OK message to confirm. The ISDN terminal (by the service user) sends a DSS1 RETRIEVE message to reply to the hold call. The call reference (CR) in the message is the call reference used by the remote user to call. The message content is as follows:

 08 01 02 24

 The SIP user adaptation node of the present invention encapsulates DSS1 by using SIP INFO message

RETRIEVE message, the INFO message encapsulates the RETRIEVE message with the INFO message used by the conference new party session. The INFO message uses the same user session session number, and the message body adds the following content:

 Content-type: application/DSS 1 -Message; version: ITU-T; Encoding scheme = binary

 08 01 02 31

 The ISDN service control unit parses the SIP INK message bearer information, and responds to the call hold service request by using a DSS1 RETRIEVE ACK message, and the message is encapsulated in a SIP 200 OK message and sent to the SIP user adaptation node: SIP 200 OK message body Add the following:

Content-type: application/DSS 1 -Message; version= ITU-T; Encoding scheme = binary

 08 01 82 33

 The SIP user adaptation node determines that the DSS 1 message encapsulated in the SIP 200 OK message is extracted, and sends the message to the ISDN terminal; the ISDN service control unit analyzes the DSS1 RETRIEVE message, and determines that the conference initiator restores the conference call, according to The CONF service interworking logic sends a SIP INFO message carrying a DSS1 Notify message to the remote SIP user adaptation node, indicating that other parties join.

The SIP user adaptation node uses the SIP 200 OK message to confirm; the SIP user adaptation node extracts the DSS1 message in the SIP INFO message and sends the DSS1 NOTIFY message to the remote user. The ISDN service control unit sends a SIP Update message to the SIP user adaptation node, and modifies the media stream of the served user to the media resource; the SIP user adaptation section Click to confirm with the SIP 200 OK message.

 The joining of the participants of the subsequent meeting can be completed in the same process, and is not described here. Compared with the prior art, the method of the present invention can shield the user from the perception of the network difference, and completely realize the interaction of the service information, thereby implementing the ISDN service.

 As shown in Figure 7, the WCDMA user uses the supplementary service UUS1 ( User to User

The implementation of Signaling 1, inter-user signaling is used as an example to illustrate the implementation of the method of the present invention for the PLMN service. The WCDMA user accesses the SIP user adaptation node through the RNS (Radio Network Subsystem), since the RNS is transparent to the CC layer message. The method of transmission, therefore, the process of the terminal passing the RNS to the SIP user adaptation node is omitted in the figure, and the message is sent directly from the user terminal to the SIP user adaptation node, and the process premise, the user has completed the access process, the specific process It is not within the scope of the present invention and will not be described again. The process is explained as follows: First, the user terminal sends a CC layer SETUP message to the SIP user adaptation node, the called number in the SETUP message is 8880000, the bearer capability is SPEECH, carries the UUS1 information, and the user adapts the wireless CC layer message received by the node. The content is as follows, wherein the data information of the UUS information unit of the DSS1 signaling added in the information body is embodied in an underlined form:

 03 01 05 04 04 a0 5E 05 A1 88 88 00 08 7E OA 04 38 38 38 38 38 38 38 38 38 38

 Next, the SIP user adaptation node translates the CC layer SETUP message into a SIP INVITE message according to the mapping method of the prior art, and adds a message body:

 Content-type: application/DSSl-IE; version^ ITU-T; Encoding scheme

= binary

 7E OA 04 38 38 38 38 38 38 38 38 38 38

 The content of the message body is a binary representation of the DSS1 UUS information element;

Of course, the above content is also parsed into a textual description for encapsulation. For a DSS1 information element containing the content of "1 0A 04 38 38 38 38 38 38 38 38 38 38 38", the binary code stream 7E is identified according to the definition of the CC layer information unit structure. UUS information unit, 0A identifies the length of the information unit, 04 identifies the protocol identifier, and the rest is UUS data information. The information that can be converted into text by this parsing is described below. Content-type: application/DSS 1 -IE; version^ ITU-T; Encoding scheme = us-ascii

 UUS, pd=0f, dat=38 38 38 38 38 38 38 38 38 38

 The UUS identifies the information unit name, pd is the protocol identifier, and the dat is the UUS data information.

 The above underlined portion is a UUS information unit that adds CC layer signaling in the information body.

 An example of the message is as follows:

 INVITE sip:8880008@ RNS.example.com SIP/2.0

 Via: SIP/2.0/UDP acess.example.com

 From: sip:8880006@agl. example.com

 To: sip:8880008@RNS.example.com

 Call-ID: 12345678908888888888@example.com

 CSeq: 1234 INVITE

 Contact: <sip:8880006@example.com>

 Content-Length: 385

 MIME- Version: 1.0

 Content-Type: application/SDP; charset=ISO- 10646 v=0

 o=audet 2890844526 2890842807 5 IN IP4 132.172.62.2 s=SDP example

 c=IN IP4 access . example . com

 t= 2873397496 2873404696

 m=audio RTP/AVT 8

 a= - b= 12kbit/s

 Content-type: application/DSS 1 -IE; version= ITU-T; Encoding scheme = binary

7E OA 04 38 38 38 38 38 38 38 38 38 38 The service control unit receives the SIP message, analyzes the message and the in-vivo information, and determines whether the user has the UUS1 service authority according to the user subscription data. Because the UUS information unit transmits the information end-to-end, the message is transparently transmitted to the The SIP user adaptation node that is called the user (that is, the remote user B of the service user A) belongs to the SIP user adaptation node. If the user has no service authority, the service control unit deletes the UUS information encapsulated in the message body.

 Then, the destination SIP user adapts the node, analyzes the message content, translates the SIP INVITE message into a wireless CC layer SETUP message, identifies the SIP message body node of the SIP message body content, analyzes the message content, and maps the INVITE message to the existing method according to the existing method. The SETUP message of the radio CC layer identifies the SIP message body bearer information radio CC layer information element, extracts and appends it to the SETUP message, and sends it to the ISDN terminal B to implement the UUS1 service.

 In addition, it should be noted that, in the mobile communication network, the mobile terminal (Mobile Station) of the traditional circuit domain accesses the L2 (Layer 2) layer and the L3 layer (network layer) of the Um interface of the network from the user in the ISDN network. The porting interface of the network interface (UI) in the mobile communication network, the L2 data link layer of the Um interface is based on the modification of the D-channel link access protocol for ISDN, provided in the CM (connection management) sub-layer in the L3 layer. The supplementary service is also based on various ISDN supplementary services. The CM sublayer is terminated to the MSC (Mobile Switching Center) through the radio access network. If the radio access network is connected to the packet core network by adaptation at this time, it is obvious that the CM sub- The layer information is encapsulated into a SIP message, that is, the foregoing system and method for transmitting digital subscriber signaling, and is also applicable to a mobile terminal of a conventional circuit domain to a packet core network using SIP as call control signaling, in a SIP message body The complete CM unit or part of the CM unit is encapsulated in order to provide basic services and supplementary services for the mobile terminal through the packet core network. Further, since the CM sublayer further includes a call control unit, a supplementary service unit, and the like, the complete call control unit/supplement service unit may be encapsulated in the SIP message body, or part of the content of the call control unit/supplement service unit may be encapsulated.

 Therefore, the ISDN terminal in the present invention includes a mobile terminal of a traditional circuit domain; the ISDN service includes basic services of a mobile terminal in a conventional circuit domain, supplementary services, and the like; and the digital user signaling includes digital User One Signaling also includes CM sublayer signaling for the wireless interface.

The embodiment of the invention further provides a device for transmitting digital user signaling, which is applied to adopt an access The session initiation protocol is used as the packet core network of the call control signaling, and the device includes: a first interface, configured to connect to the packet core network;

 a second interface, configured to connect to an ISDN terminal device signaling path;

 a message receiving unit, configured to receive a first digital user signaling message or a first session initiation protocol SIP message transmitted by the first interface and the second interface;

 a message processing unit, coupled to the message receiving unit, for encapsulating or mapping the first digital user signaling message content from the message receiving unit in a second session initiation protocol message, or for receiving the first session from the first session Generating a second digital user signaling message in the initiation protocol SIP message;

 The message sending unit is connected to the message processing unit, and configured to send the second session initiation protocol message or the second digital user signaling message from the message processing unit to the first interface and the second interface.

 The first interface is a session initiation protocol message interface that encapsulates digital user signaling information, and the second interface is a digital user signaling message interface.

 The digital subscriber signaling information of the first interface refers to a binary digital subscriber message or information element or a digital subscriber signaling message or information element described in textual form.

 The digital subscriber signaling message interface is a digital number one user signaling network layer message interface or a wireless interface signaling connection management layer message interface.

 An embodiment of the present invention provides a system for transmitting digital subscriber signaling, including a packet core network and at least one ISDN terminal, where the packet core network includes an ISDN service control unit and a media resource control unit corresponding to different ISDN terminals.

 A session initiation protocol SIP user adaptation node is disposed between the ISDN terminal and the packet core network, and the ISDN terminal is connected to the ISDN service control unit by using a SIP user adaptation node; the ISDN service control unit is configured to provide an ISD service logic. Controlling, network resource control function, and signaling interaction with another ISDN service control unit to establish a connection with the other ISDN terminal;

The session initiation protocol user adaptation node is configured to encapsulate the DSS1 signaling message into the SIP message body to provide a signaling adaptation between the signaling protocol DSS1 and the SIP as a protocol conversion node. According to the present invention, when an ISDN terminal is connected to a packet core network using SIP as call control signaling, by carrying a complete digital subscriber signaling L3 layer message or a partial information element in the L3 message in the SIP message body, The digital subscriber signaling L3 layer protocol information is transmitted between the ISDN terminal and the ISDN service control unit, thereby implementing the ISDN service and achieving the purpose of inheriting the ISDN service in the packet network.

 In a specific embodiment of the present invention, fixed and mobile digital subscriber signaling L3 layer information may be described using the same media type of the SIP message body, and fixed and mobile numbers may also be described using different media types of the SIP message body. User signaling L3 layer information.

 It is to be understood that the above description of the specific embodiments is intended to be illustrative and not restrictive of the scope of the invention.

Claims

Rights request

 A method for transmitting digital subscriber signaling, applied to a packet core network using a session initiation protocol as call control signaling, comprising the steps of:

 The ISDN service information exchange is performed between the ISDN service control unit and the session initiation protocol SIP user adaptation node by using a session initiation protocol SIP message encapsulated with digital user signaling information, and the ISDN service control unit uses the ISDN service information to perform Business control, thereby implementing ISDN services;

 The SIP user adaptation node is configured to provide a SIP signaling adaptation function for accessing an ISDN terminal for a packet network that uses the SIP protocol as the core network call control signaling; and the ISDN service control unit is configured to provide an ISDN service control function. .

 2. The method according to claim 1, wherein the interworking of the ISDN service information specifically includes:

 The SIP user adaptation node of the service user receives the digital user signaling message, encapsulates the relevant information in the SIP message, and sends the SIP message to the ISDN service control unit of the served user;

 The serviced user ISDN service control unit accepts the SIP message for service processing, and sends the SIP message with the digital user signaling information to the SIP user adaptation node or the remote network of the served user;

 The SIP user adaptation node of the service user or the remote user receives the SIP message from the ISDN service control unit, translates it into a digital user signaling message, and sends it to the corresponding ISDN terminal.

 The method according to claim 2, wherein the encapsulating the related information in the SIP message specifically includes:

 The received digital user signaling message is encapsulated in a SIP message, or the information element contained in the digital user signaling message is encapsulated.

 The method according to claim 2, wherein the SIP user adaptation node translates the SIP message into a digital user signaling message, which specifically includes:

 The SIP user adaptation node parses the received digital user signaling message and describes the message or the information element in the message in a textual manner, thereby encapsulating the text description information.

5. The method according to claim 2, wherein the SIP user adaptation section After receiving the SIP message, the method further includes: identifying the content in the SIP message body: when determining that the content in the SIP message body is a binary digital user signaling message or an information element, extracting the message body content, and The assembled digital user signaling message is transmitted to the user ISDN terminal.

 The method according to claim 2, wherein after the SIP user adaptation node receives the SIP message, the method further includes: identifying the content in the SIP message body: when determining the SIP message The digital user signaling information in the text mode is parsed, and the digital user signaling information in the text mode is parsed, and the binary digital user signaling message is configured to be sent to the user ISDN terminal.

 The method according to any one of claims 2 to 6, wherein the encapsulation is implemented by adding a new media type of the SIP message body, or extending an existing media type.

 8. The method according to claim 7, wherein the encapsulation comprises a binary encapsulation and/or a text encapsulation, implemented by a codec indication field in a media type description.

 9. The method according to claim 8, wherein the method adopts at least one encapsulation method;

 When two encapsulation methods are used, the encapsulation mode can be distinguished by setting different media types or setting different parameters of a media type.

 10. The method according to claim 2, wherein the digital subscriber signaling is digital subscriber number one signaling or a wireless interface connection management layer signaling.

 A device for transmitting digital user signaling, which is applied to a packet core network that uses a session initiation protocol SIP as call control signaling, and the device includes: a first interface, configured to connect to a packet core network;

 a second interface, configured to connect to an ISDN terminal device signaling path;

 a message receiving unit, configured to receive a first digital user signaling message or a first session initiation protocol SIP message transmitted by the first interface and the second interface;

a message processing unit, configured to be connected to the message receiving unit, for encapsulating or mapping the first digital user signaling message content from the message receiving unit in a second session initiation protocol SIP message, or for receiving the first received message Generating a second digital user letter in the Session Initiation Protocol SIP message Order message

 The message sending unit is connected to the message processing unit, and configured to send the second session initiation protocol SIP message or the second digital user signaling message from the message processing unit to the first interface and the second interface.

 The device according to claim 11, wherein the first interface is a SIP message interface that encapsulates digital user signaling information, and the second interface is a digital user signaling message interface.

 13. The apparatus according to claim 11, wherein the digital user signaling information of the first interface refers to a binary digital user message or information unit or a digital user signaling message or information unit described in text mode.

 14. The apparatus according to claim 11, wherein the digital subscriber signaling message interface is a digital number one user signaling network layer message interface or a wireless interface signaling connection management layer message interface.

 15. A system for transmitting digital subscriber signaling, comprising a packet core network and at least one ISDN terminal, the packet core network comprising an ISDN service control unit and a media resource control unit corresponding to different ISDN terminals, wherein

 A session initiation protocol SIP user adaptation node is disposed between the ISDN terminal and the packet core network, and the ISDN terminal is connected to the ISDN service control unit by using a SIP user adaptation node; the ISDN service control unit is configured to provide ISDN service logic. Controlling, network resource control function, and signaling interaction with another ISDN service control unit to establish a connection with the other ISDN terminal;

 The session initiation protocol user adaptation node is configured to encapsulate the DSS1 signaling message into the SIP message body to provide a signaling adaptation between the signaling protocol DSS1 and the SIP as a protocol conversion node.