WO2009021430A1

WO2009021430A1 - A call connection method, equipment and system in ip multimedia subsystem

Info

Publication number: WO2009021430A1
Application number: PCT/CN2008/071818
Authority: WO
Inventors: Youzhu Shi; Qing Zhou
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-08-10
Filing date: 2008-07-30
Publication date: 2009-02-19

Abstract

The implementation of present invention discloses a method of call connection in IMS, includes: the entrance network element of called network receives the session request form calling network, and the session request includes the identification information of called user; when the entrance network element of called network judges that the identification information of called user is not integrity, the entrance network element of called network sends the response message to the calling network to indicate the identification information of called user is not integrity; the calling network updates the identification information of called user according to the response message, and sends the updated identification information of called user to the entrance network element of called network. The implementation of present invention also discloses an entry network element, a called network system, a call connection system and a method of informing failed call connection. The implementation of the invention informs the calling network the reason of failed call connection when the address form the calling network is not integrity and realizes sending geminate codes after the continuous process of the calling network.

Description

Call connection method, device and system in IP multimedia subsystem

The present invention relates to the field of IP Multimedia Subsystem (IMS) technology, and more particularly to a call connection method, apparatus and system in an IP Multimedia Subsystem.

Background technique

As packet technology continues to mature, traditional telecommunications networks based on circuit switching are evolving to packet-switched broadband telecommunications networks, while Session Initiation Protocol (SIP) is used as the packet telecommunications core network for call control signaling. One of the current technological trends. For example: in the International Telecommunication Union - Telecommunication Standardization Sector (ITU-T) and the European Telecommunications Standards Institute (ETSI) standards organizations such as Next Generation Network (NGN) In the course of the research, the IP Multimedia Subsystem (IMS) network architecture defined by the Third Generation Partnership Project (3GPP) standards organization was adopted as the core network of NGN.

IMS is an IP multimedia subsystem defined by the 3GPP standard. It is the target network of the third generation (3G) mobile communication network to realize packet voice and packet data and provide unified multimedia services and applications. The IMS uses the IP packet domain as the bearer channel for its control signaling and media transmission, and uses the SIP protocol as the call control signaling to realize the separation of service management, session control and bearer access. The SIP protocol is an application layer control protocol for establishing, changing, and terminating multimedia sessions or calls. These multimedia sessions include multimedia conferencing, distance learning, Internet telephony, etc., and its core is the Internet Engineering Task Force. IETF) Standard Organization Definition.

With the gradual maturity and commercialization of IMS technology, operators have considered the evolution of the traditional Public Switched Telephone Network (PSTN) network to the IMS network, enabling the traditional Plain Telephone Service (POTS) end users. also may To access the IMS network.

However, the dialing mode of the POTS terminal is over lap sending, that is, the user dials a single number, and the POTS terminal sends a one-digit number to the network; and the SIP protocol used by the IMS network supports the overall sending mode, that is, After the user is asked to dial all the numbers, all called numbers are sent to the network at one time. Therefore, when the POTS terminal accesses the IMS network, the IMS network is required to support overlapping transmission.

At present, there is no suitable technical solution in the prior art to solve the problem of supporting overlapping transmission codes in an IMS network. In addition, in the IMS network in the prior art, when the called user identification information address is incomplete due to overlapping transmission and other problems, and the call connection fails, the reason for the failure of the calling network call connection cannot be notified, and the call will be further caused. The connection failed.

Summary of the invention

The embodiment of the present invention proposes a call connection failure notification method in the IMS, which can notify the reason why the calling network call connection fails.

The embodiment of the invention also proposes a call connection method in the IMS, which can support overlapping code transmission in the IMS network.

The embodiment of the present invention further provides an ingress network element in the IMS, and the ingress network element can be used to support overlapping code transmission in the IMS network.

The embodiment of the invention also proposes a called network system in the IMS, and the called network system can support overlapping code transmission in the IMS network.

The embodiment of the invention also proposes a call connection system in the IMS, and the called network system can support overlapping code transmission in the IMS network.

The technical solution of the embodiment of the present invention is as follows:

An IP multimedia subsystem IMS call connection failure notification method, including:

The called network ingress network element receives the session request of the calling network, and includes the called user identification information in the session request;

When the called network ingress network element determines that the called user identification information is incomplete, the called network ingress network element sends a response cancellation indicating that the called user identification information is incomplete to the calling network. Information to notify the calling network that the call connection failed.

A call connection method in an IP multimedia subsystem, the method comprising:

And when the called network ingress network element determines that the called user identification information is incomplete, sending, to the calling network, a response message indicating that the called user identification information is incomplete;

And the calling network updates the called user identification information according to the response message, and sends the updated called user identification information to the called network ingress network element.

An ingress network element in the IMS, including a session request receiving unit and a called user identification information determining unit, where:

a session request receiving unit, configured to receive a session request of the calling network, where the called user identifier information is included in the session request;

The called user identification information determining unit is configured to, when determining that the called user identification information is incomplete, send a response message indicating that the called user identification information is incomplete to the calling network.

A called network system in an IMS, the system comprising an ingress network element and a routing information database, wherein:

An ingress network element, configured to receive a session request of the calling network, where the session request includes the called user identification information, and query the address information of the called user in the routing information database according to the called user identification information, when Sending a response message indicating that the called user identification information is incomplete to the calling network when the query fails;

The routing information database is used to store the address information of the called user.

A call connection system in an IMS, comprising:

a calling network, configured to send a session request to the called network ingress network element, where the session request includes the called user identification information;

The called network ingress network element is configured to send, to the calling network, a response message indicating that the called user identification information is incomplete when determining that the called user identification information is incomplete. A call connection system in an IMS, comprising a calling network and a called network, the calling network comprising an overlapping code sending terminal, a calling network access network element and a service-call session control function S-CSCF of the calling network; The called network includes the called network access network element; the S-CSCF of the calling network is connected with the called network access network element;

among them:

An overlapping code transmitting terminal, configured to send the called user identification information to the calling network access network element; the calling network accessing network element, configured to access the overlapping code sending terminal to the IMS network, and the called user The identification information is carried in the session request, and the session request is sent to the calling network.

S-CSCF;

An S-CSCF of the calling network, configured to route the session request to the called network access network element; the called network access network element, configured to: when determining that the called user identification information is incomplete, The S-CSCF of the calling network sends a response message indicating that the called user identification information is incomplete.

As can be seen from the foregoing technical solution, the called network ingress network element receives the calling network session request that includes the called user identification information; when the called network ingress network element determines that the called user identification information is incomplete, The called network ingress network element sends a response message indicating that the called user identification information is incomplete to the calling network. It can be seen that after applying the embodiment of the present invention, the reason for the failure of the calling network call connection can be notified, so that the solution of overlapping code transmission in the IMS network can be realized through subsequent processing of the calling network.

DRAWINGS

1 is a flow chart of a call connection method in an IMS system according to an embodiment of the present invention;

2 is a schematic structural diagram of an entry network element in an IMS system according to an embodiment of the present invention;

3 is a schematic structural diagram of a called network system in an IMS system according to an embodiment of the present invention; FIG. 4 is a schematic structural diagram of a call connection system of an IMS system according to an embodiment of the present invention; FIG. 5 is a call connection of an IMS system according to an embodiment of the present invention; FIG. 6 is a schematic flow chart of a call connection method of an IMS system according to an embodiment of the present invention. detailed description 1 is a flow chart of a call connection method in an IMS system according to an embodiment of the present invention. As shown in Figure 1, the method includes:

Step 101: The called network ingress network element receives a session request of the calling network, and includes the called user identification information in the session request.

Here, the called network ingress network element can be either an I-CSCF or an IBCF or an MGCF. The session request sent by the calling network may be any one of the following SIP messages: an initial session request INVITE, a subsequent request re-INVITE of the initial session request, a request request REFER, a message request MESSAGE, a subscription request SUBSCRIBE, or an information request INF0. Moreover, the format of the called user identification information can be either a TEL URI or a SIP URI.

The called subscriber identity information can be included in the following sections of the session request:

1) request a Reques t URI; or

2) header fields (such as To header field, Refer-To header field), etc.; or

3) The body of the message, for example in a message body that passes a specific MIME type.

Further, the session request may further include a called user identifier request request. The called user identifier request request indicates whether the request information of the called network to the called user identification information is returned, such as the minimum number length requirement, the maximum number length requirement, and the address type requirement, when the called user identification information is incomplete. (International, domestic), address format requirements (SIP URI, TEL URI), etc.

The called user identification request request may be a direct indication, or may be an indirect indication, such as carrying the terminal's capability information, supporting overlapping transmission, and the grounding indication request returns the called network to the called user identification information. Claim.

The called subscriber identity request request may be included in the following sections of the session request:

1) request a Reques t URI (such as a specific prefix in the URI to indicate); or

2) header fields (such as Contact, Supported, Required header fields, etc.); or

3) The message body, for example, in a message body that passes a specific MIME type.

Step 102: When the called network ingress network element determines that the called user identification information is incomplete, send a response message indicating that the called user identification information is incomplete to the calling network, to notify the calling network. The network call connection failed.

Here, the called user identification information address is incomplete, which means that the called network cannot obtain the address information of the called user according to the called user identification information, thereby implementing routing of the session request.

In order to determine whether the called user identification information is complete, the called network ingress network element may query the user subscription database to determine whether the called user identification information is a valid called user identifier.

Further, when the called user identification information is incomplete, the user subscription database may return the required information of the called user identification information to the ingress network element, such as a minimum number length requirement, a maximum number length requirement, and an address type requirement (international, domestic). The address format requirement (SIP URI, TEL URI), etc., the ingress network element then sends the requested information of the called network to the called user identification information to the calling network; further, in order to request the user to sign the database and return the called user The request information of the identification information, the called network ingress network element may carry the called identification information request indication in the query message;

Further, in order to determine whether the user subscription database is required to return the required information of the called user identification information, the called network ingress network element may be determined according to the session request or configuration information of the calling network;

When the called network ingress network element determines whether the user subscription database is required to return the requested information of the called user identification information according to the session request of the calling network, the called network ingress network element may be based on the called user in the calling network session request. The identification request is requested to perform the judgment.

When the called network ingress network element determines that the called user identification information is incomplete, the called network ingress network element sends a response message indicating that the called user identification information is incomplete to the calling network. The response message sent by the called network ingress network to the calling network may be either a response message for the session request message in step 101 or a new request message, such as an INFO message.

In order to indicate that the called subscriber identity information address is incomplete, the called network ingress network element may also be indicated by a special response message (eg, via an 484 (incomplete address) response message). The called network ingress network element may also carry corresponding indication information in the header field or the message body of the corresponding response message or the request message, such as indicating the called user identifier in the Reason header field of any one of the failure response message or the INFO request message. Incomplete information. Further, the response message sent by the called network ingress network element may further carry the required information of the called network to the called user identification information, such as a minimum number length requirement, a maximum number length requirement, and an address type requirement (international, domestic), Address format requirements (SIP URI, TEL URI), etc.

So far, the above steps 101 and 102 implement the call connection failure notification in the IMS, and the response message can inform the reason why the calling network call connection fails.

Preferably, the response message received by the calling network is subsequently processed, and the foregoing process may further include:

Step 103: The calling network updates the called user identification information according to the response message, and sends the updated called user identification information to the called network ingress network element.

After receiving the above response, the calling network may obtain updated called user identification information by waiting for the user to dial, receive the number, or convert the called user identification information.

If the response message carries the demand information of the called network to the called user identification information, the calling network may convert the called user identification information according to the demand information, or continue to wait for the user to dial and receive the number.

Then, the calling network sends a session request to the called network, and the updated called called user identification information is included in the session request;

The calling network may send a session request to the called network by the following method:

1) sending a new request in the current session, such as a re-INVITE request, an INFO request, etc., and including the updated called user identification information in the new request;

2) The current session can also be released, and then a new session request, such as an INVITE request, a REFER request, a MESSAGE request, a SUBSCRIBE request, etc., is included, and the updated called user identification information is included in the new session request;

The updated called user identification information included in the session request may be the complete information of the updated called user identification information; or may be the newly added information of the updated called user identification information, the ingress network of the called network. The element can obtain the complete called user identification information according to the newly added information.

Based on the foregoing analysis, an embodiment of the present invention further provides an ingress network element in an IMS system. FIG. 2 is a schematic structural diagram of an ingress network element 200 in an IMS system according to an embodiment of the present invention.

As shown in FIG. 1, the ingress network element 200 includes a session request receiving unit 201 and a called user identification information determining unit 202, where:

The session request receiving unit 201 is configured to receive a session request of the calling network, where the called user identifier information is included in the session request;

The called user identification information determining unit 202 is configured to, when determining that the called user identification information is incomplete, send a response message indicating that the called user identification information is incomplete to the calling network.

The called user identification information determining unit 202 can determine whether the called user identification information address is complete by querying the user subscription database.

Moreover, the called user identification information determining unit 202 may be further configured to carry the demand information of the called user identification information in the response message.

In addition, the called user request request may be further included in the session request. At this time, the ingress network element 200 may further include a called user identification information processing unit. The called user identification information processing unit is configured to initiate a query request to the routing information database, where the query request carries the called user identification request indication, and returns the user subscription database according to the called user identification request indication. The demand information called the user identification information is carried in the response message.

The embodiment of the invention also discloses a called network system in an IMS system.

FIG. 3 is a schematic structural diagram of a called network system in an IMS system according to an embodiment of the present invention.

As shown in FIG. 3, the called network system 300 includes an ingress network element 301 and a routing information database 302, where:

The ingress network element 301 is configured to receive a session request of the calling network, where the called user identifier information is included in the session request, and the address information of the called user is queried in the routing information database 302 according to the called user identification information. Sending, to the calling network, a response message indicating that the called user identification information is incomplete when the query fails;

The routing information database 302 is configured to save address information of the called user. Preferably, the routing information database 302 is a user subscription database. The routing information database 302 can be further used in the office The response message carries the demand information of the called user identification information.

In addition, the ingress network element 301 may send a query message carrying the called identification information request indication to the routing information database 302. After receiving the query message, the routing information database 302 queries the called user's address according to the called user identification information. The information, and the demand information of the called user identification information is returned to the ingress network element 301 according to the called identification information request indication.

The embodiment of the invention also discloses a call connection system in an IMS system.

4 is a schematic structural diagram of a call connection system of an IMS system according to an embodiment of the present invention.

As shown in FIG. 4, the call connection system 400 includes a calling network 401 and a called network ingress network element 402, where:

a calling network 401, configured to send a session request to the called network ingress network element 402, where the called user identifier information is included in the session request;

The called network ingress network element 402 is configured to send, to the calling network 401, a response message indicating that the called user identification information is incomplete when determining that the called user identification information is incomplete.

The calling network 401 is further configured to update the called user identification information according to the response message, and send the updated called user identification information to the called network ingress network element 402.

The calling network 401 may initiate a new request in the current session, and carry the updated called user identification information in the new request; or

The calling network 401 can also release the current session, and then initiate a new session request to the called network ingress network element 402, and carry the updated called user identification information in the new session request.

The updated called user identification information sent by the calling network 401 to the called network ingress network element 402 may include: sending the updated complete information of the called user identification information to the called network ingress network element 402; The network ingress network element 402 is called to send updated information of the called user identification information.

FIG. 5 is a schematic diagram showing an exemplary structure of a call connection system of an IMS system according to an embodiment of the present invention. As shown in FIG. 5, the system includes a calling network and a called network, and the calling network includes overlapping code ends. The terminal 501, the calling network access network element 502, and the service-call session control function (S-CSCF) 503 of the calling network; the called network includes the called network access network element 504; and the S-CSCF 503 of the calling network. Connected to the called network access network element 504.

The overlapping code transmitting terminal 501 is configured to send the called user identification information to the calling network access network element 502. The overlapping code transmitting terminal 501 is a terminal that supports overlapping code transmission, such as a POTS terminal.

The access network element 502 is configured to access the overlapping code transmitting terminal 501 to the IMS network, carry the called user identification information in the session request, and send the session request to the S-CSCF 503 of the calling network. The access network element 502 is a network element that accesses the overlapping code transmitting terminal 501 to the IMS network. For example, the access network element 502 can be an integrated access device (IAD), an access gateway (AG), an access gateway control function (AGCF), and the like. The interface between the access network element 502 and the overlapping code-issuing terminal 501 is an E1 interface, and the E1 interface includes but is not limited to the H.248 protocol, the SIP protocol, and the like. The E1 interface can be either a direct interface or an indirect interface. The indirect interface means that other network elements exist between the access network element 502 and the overlapping code transmitting terminal 501.

The S-CSCF 503 is configured to route the session request to the called network access network element 504. The S-CSCF 503 is an IMS network element located in the calling network, providing session control and routing functions, and the S-CSCF 503 is downward. The interface between the access network element 502 and the access network element 502 is an E2 interface, and the E2 interface can be an SIP protocol. The E2 interface can be either a direct interface or an indirect interface. The indirect interface means that other network elements exist between the S-CSCF 503 and the access network element 502.

The called network ingress network element 504 is configured to send, to the S-CSCF 503 of the calling network, a response message indicating that the called user identification information is incomplete when determining that the called user identification information is incomplete. The called network ingress network element 504 is the first network element that the call enters the called network, and may be, for example, an I-CSCF. The interface between the called network ingress network element 504 to the left and the S-CSCF 503 is an E3 interface, and the E3 interface may be a SIP protocol. The E3 interface here may be a direct interface or an indirect interface. The indirect interface refers to other network elements between the called network ingress network element 504 and the S-CSCF 503.

In addition, the called network further includes a user subscription database 506 for providing user subscription data. Storage and management functions, such as HSS (Home Subscriber Server, Home Subscriber Server). The interface between the user subscription database 506 to the left and the ingress network element 504 is an E4 interface, and the E4 interface is a Diame ter protocol. The E4 interface can be either a direct interface or an indirect interface. The indirect interface refers to other network elements between the user subscription database 506 and the ingress network element 504.

The called network may further include an S-CSCF 505 of the called network;

The S-CSCF 505 of the called network is an IMS network element located in the called network for providing session control and routing functions. The interface between the S-CSCF 505 and the ingress network element 504 is an E5 interface, and the E5 interface is an S IP protocol. The E5 interface can be either a direct interface or an indirect interface. The indirect interface refers to other network elements between the S-CSCF 505 and the ingress NE 504.

The calling network access network element 502 is further configured to receive the dialing and receiving number of the overlapping code sending terminal 501, and determine the called user identification information according to the demand information of the called network to the called user identification information. When the need is met, the session request is sent to the called network access network element 504 again through the S-CSCF 503;

The called network access network element 504 is configured to, when determining that the called user identification information is complete, routing the session request to the S-CSCF 505 of the called network;

The S-CSCF 505 of the called network is configured to route the session request to the user terminal 507 to effect the connection of the session request.

Based on the above structural diagram, FIG. 6 is a schematic flowchart diagram of a call connection method of an IMS system according to an embodiment of the present invention.

As shown in Figure 6, the method includes:

Step 1: The overlapping code-issuing terminal user (hereinafter referred to as the user) picks up the phone and dials, if the called user number that wants to call is 28423279;

Step 2: The user dials the first digit "2", and the AG receives the number;

Step 3: The user continues to dial;

Step 4: When the user dials the minimum number configured on the AG, the AG will initiate a session request. For example: Suppose the minimum number configured on the AG is 4, when the user dials "2842", the AG will initiate the conference. Request

Step 5: The AG initiates a session request to the S-CSCF of the calling network, and sends an INVITE request message to the S-CSCF of the calling network, where the Reques t URI of the INVITE request carries the called user identification information in the following format:

TEL URI : 2842;

The AG can also pass the above information in the SIP URI format, such as SIP URI: 2842o)telechina.com;

Here, the scenario in which the AG initiates an initial session request through the INVITE message is described. In fact, the AG can also initiate a message request through MESSAGE, or initiate a subscription request through SUBSCRIBE, or initiate a consultation request through REFER; carry the identification information of the called user in the Reques t URI; handle the processing of the called network with the INVITE request Handling class tests.

Further, since the AG supports overlapping code transmission, it can carry the called user identity request request in the INVITE message, and the format is as follows:

Supported: over lap;

The AG can also carry the called user identity request request through other header fields, or Reques t URI, or message body.

Step 6: The S-CSCF of the calling network forwards the above INVITE request to the ingress network element I-CSCF of the called network;

The S-CSCF of the calling network can also forward the above INVITE request to the ingress network element IBCF of the called network, the processing of the IBCF and the I-CSCF type test, which will not be described here.

Step 7: The ingress network element of the called network I-CSCF sends a called location query request to the user subscription database (such as HSS). For example, the ingress network element I-CSCF of the called network sends a called location query request to the HSS through a User Authorization Request (UAR) message of the Diameter protocol; the user authorization request message carries the called user identification information to query the called party. User's location information;

Further, because the received INVITE request includes the called user identity request request, the I-CSCF carries the called location query request to the user subscription database, and carries the Call the identification information request indication.

The I-CSCF can also determine whether to carry the called identification information request indication in the query message by means of local configuration (such as from a calling network or default).

The called network ingress network element may also determine, according to the session request or configuration information of the calling network, whether the user subscription database is required to return the required information of the called user identification information.

To carry the called identity information request indication in the UAR message, the following methods can be used: Expand the new AVP (attribute value pair), such as extending the following AVP:

Requi re - Va l id - Ca l led - Addres s - Indi ca t ion: Indicates whether the user is required to sign the database to return the requested information of the called user identification information; if the enumeration value 0 means no request, the enumeration value 1 indicates the requirement .

Here, the I-CSCF queries the called location information by accessing the user subscription database. In fact, the I-CSCF can also query the called location information by accessing the local database or by accessing other network entities.

Step 8: The HSS queries the local database (or other database) to query the location information of the called user according to the called user identification information. In this embodiment, the number of the called subscriber identity information carried by the calling network is 2842, and the called subscriber number is incomplete. Therefore, the HSS cannot obtain the address information of the called subscriber according to the called number.

Step 9: The HSS returns the query result to the I-CSCF, indicating that the called address is incomplete. For example, the HSS returns a query result to the I-CSCF through a User Authorization Response (UAA) response message of the Diameter protocol, where the user authorization response message carries an indication that the called address is incomplete.

In order to carry the indication that the called address is incomplete in the U A A response message, the following methods can be used:

A, using the existing parameters; such as the value of Resul t-Code (result value) AVP (the attribute value pair) according to the UAA message, if it is the parameter DIAMETER-UNREGISTERED-SERVICE (unregistered), it means the address is not complete;

B. Use the existing AVP and extend its value; such as extending an enumerated value of Resul t-Code (result value) AVP (attribute value pair): DIAMETER— UNCOMPLETE—ADDRESS (incomplete address), Indicates that the address is incomplete;

Further, the foregoing UAA response message may further carry the required information of the called user identification information, such as a minimum number length requirement, a maximum number length requirement, an address type requirement (international, domestic, local), and an address format requirement (SIP URI, TEL URI). )Wait;

In order to carry the demand information of the called user identification information in the UAA response message, the new AVP may also be extended, such as extending the following AVP:

Ca l led-Addres s-Min-Length: indicates the minimum length required;

Ca l led-Addres s-Max-Length: indicates the maximum length required;

Ca l led-Addres s-Type-Required: indicates the requested type of called address, such as the enumeration value INTERNATIONAL indicates that the international number is required, the enumeration value NATIONAL indicates that the domestic number is required, and the enumeration value LOCAL indicates that the local number is required;

Ca l led-Addres s-Format-Requi red: indicates the requested address format of the called, such as the enumeration value FORMAT-TEL-URI indicates that the TEL URI format is required, and the enumeration value FORMAT-SIP.URI indicates that the SIP URI format is required;

Step 10: The I-CSCF of the called network sends a response to the calling network, indicating that the called user identity information address is incomplete;

In order to indicate that the called user identification information address is incomplete, the I-CSCF of the called network may indicate by a special response message, such as a 484 (address incomplete) response message, and may also be in the header field of the corresponding response message or request message. Or the message body carries corresponding indication information, such as indicating that the address is incomplete in the Reason header field of an INF0 request message.

Further, the response may further carry the required information of the called network to the called user identification information. In order to carry the foregoing requirement information in the response, the response may be transmitted through a MIME message body, such as extending an al icat ion/ ca 1 The led-addres s-required types are as follows:

SIP/2. 0 484 Addres s Incomplete

Content: appl icat ion/ ca l led-addres s-required Content-Length: ....

[Body]

Min-length: 8

Max-length: 8

Type-Required: LOCAL

Format-Required: TEL-URI

Indicates that the minimum number length is 8, the maximum number length is 8, the required called user identification type is a local address, and the called user identification format is a TEL URI;

Step 11: The S-CSCF of the calling network forwards the foregoing 484 response message to the AG of the calling network; Step 12: The AG of the calling network waits for the user to dial, and receives the number;

Step 13: The user dials the 8-digit number "28423279";

Step 14: The AG of the calling network determines that the number dialed by the user has reached the requirement of the called network according to the demand information (the minimum number length 8 and the largest number length 8) of the called user identification information in the called network response message. Sending a session request to the called network;

At this time, in order to send a session request to the called network, the AG may release the current session, initiate a new session request, or send a new request in the current session; the AG initiates a new session request in the same manner as step 505. This describes the case where the AG sends a new request in the current session. The AG can send a re-INVITE request or an INF0 request in the current session. The updated user identification information can be passed in the Reques t URI, SIP header field, or message body.

In order to include the updated called user identification information in the session request, the complete information of the updated called user identification information may be included in the session request, such as carrying the TEL URI in the Reques t URI through a re-INVITE request: 28783279 ; The newly added information may also be included in the session request, such as carrying an newly dialed number in the To header field by an INF0 message: TEL URI: 3279.

In this embodiment, the AG sends a re-INVITE request (the INVITE message in the figure, and the difference between the INVITE message is in one session), and carries the TEL URI in the Reques t URI: 28783279; Step 15: The S-CSCF of the calling network forwards the above INVITE request to the ingress network element I-CSCF of the called network;

Step 16: The ingress network element I-CSCF of the called network sends a called location query request to the user subscription database (HSS) (class test step 7); if the calling network carries the new in the called user identifier of the INVITE request The added information, such as the re-INVITE request carrying the called subscriber identity as TEL URI: 3279, the I-CSCF needs to merge the called subscriber identity information with the first received identity TEL URI: 2842 into a TEL URI: 28423279, according to The merged called user identification information sends a called location query request to the user subscription database (HSS);

Step 17: The HSS queries the local database, or other database, to query the location information of the called user, as in step 8;

Step 18: The HSS returns the query result to the I-CSCF. If the query result address is still incomplete, then similar to step 9, the HSS indicates that the called address is incomplete, and the subsequent steps 9 to 17 are repeated, and the description is not repeated.

In this embodiment, since the calling network inputs the complete called address information, in the case that the called user completes the registration, the HSS returns the address of the called network S-CSCF registered by the called user, and the called network I- The CSCF will forward the above session request to the called network S-CSCF, and the called network S-CSCF can complete the routing of the session, thereby implementing the connection of the session.

In summary, after the embodiment of the present invention is applied, the called network ingress network element receives the calling network session request that includes the called user identification information; and when the called network ingress network element determines that the called user identification information is not When complete, the called network ingress network element sends a response message indicating that the called user identification information is incomplete to the calling network. Therefore, the embodiment of the present invention can notify the reason why the calling network call fails, and therefore implements the solution of overlapping code transmission in the IMS network through subsequent processing of the calling network, so that the IMS network can communicate with various calling networks.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way. Based on such understanding, the technical solution of the present invention Essentially or partially contributing to the prior art may be embodied in the form of a software product stored in a readable storage medium, such as a computer floppy disk, hard disk or optical disk, etc., including a number of instructions. The method described in various embodiments of the present invention is performed by a computer device (which may be a personal computer, a server, or a network device, etc.).

The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. An IP multimedia subsystem IMS call connection failure notification method, which is characterized by:

The called network ingress network element receives a session request of the calling network, and includes the called user identification information in the session request;

When the called network ingress network element determines that the called user identification information is incomplete, the called network ingress network element sends a response message indicating that the called user identification information is incomplete to the calling network, to Notify the calling network that the call connection failed.

2. The call connection failure notification method in the IP multimedia subsystem according to claim 1, wherein the method comprises:

The called network ingress network element queries the user subscription database to determine whether the called user identification information is complete.

The call connection failure notification method in the IP multimedia subsystem according to claim 1 or 2, wherein the method further comprises:

The called network ingress network element carries the demand information of the called network to the called user identification information in the response message.

The call connection failure notification method in the IP multimedia subsystem according to claim 2, wherein the session request includes a called user identification request indication;

The user subscription database further determines whether to return the demand information of the called user identification information according to the called user identification request indication.

The call connection failure notification method in the IP multimedia subsystem according to claim 3, wherein the demand information of the called user identification information comprises the following information or any combination of the following information:

Minimum length requirement;

Maximum length requirement;

Address type requirements; Address format requirements.

A call connection method in an IP multimedia subsystem, the method comprising: the called network ingress network element receiving a session request of the calling network, and including the called user identification information in the session request;

The calling network updates the called user identification information according to the response message, and sends the updated called user identification information to the called network ingress network element.

The call connection method in the IP multimedia subsystem according to claim 6, wherein the method further comprises:

The called network ingress network element further carries the demand information of the called network to the called user identification information in the response message.

The call connection method in the IP multimedia subsystem according to claim 7, wherein the calling network updating the called user identification information includes:

The calling network waits for the user to dial and receive the number; or the calling network converts the called user identification information according to the demand information of the called network to the called user identification information.

The call connection method in the IP multimedia subsystem according to claim 6, wherein the sending the updated called user identification information to the called network ingress network element comprises:

The calling network initiates a new request in the current session, and carries the updated called user identification information in the new request; or

The calling network releases the current session, initiates a new session request to the called network ingress network element, and carries the updated called user identification information in the new session request.

The call connection method in the IP multimedia subsystem according to any one of claims 6-9, wherein the sending the updated called user identification information to the called network ingress network element includes: The called network ingress network element sends the updated complete information of the called user identification information; or sends the updated new information of the called user identification information to the called network ingress network element.

An ingress network element in an IMS, comprising: a session request receiving unit and a called user identification information determining unit, wherein:

12. The ingress network element of claim 11 wherein:

The called user identification information determining unit is further configured to carry the demand information of the called user identification information in the response message.

The ingress network element according to claim 12, wherein the session request further includes a called user identifier request request;

The ingress network element further includes a called user identification information processing unit.

The called user identification information processing unit is configured to initiate a query request to the routing information database, where the query request carries the called user identification request indication, and returns the user subscription database according to the called user identification request indication. The demand information of the called user identification information is carried in the response message.

14. A called network system in an IMS, characterized in that the system comprises an ingress network element and a routing information database, wherein:

The called network system in the IMS according to claim 14, wherein the ingress network element is further configured to carry, in the response message, a requirement of the called network to the called user identification information. information.

The called network system in the IMS according to claim 14, wherein the routing information database is further configured to carry the demand information of the called user identification information in the response message.

The called network system in the IMS according to claim 16, wherein the ingress network element is configured to send, to the routing information database, an inquiry message carrying an indication of the called identification information request;

The routing information database is configured to: after receiving the query message, query the address information of the called user according to the called user identification information, and return the called user identification information to the ingress network element according to the called identification information request indication Demand information.

18. A call connection system in an IMS, comprising:

a calling network, configured to send a session request to the called network ingress network element, where the called user identifier information is included in the session request;

The called network ingress network element is configured to send, to the calling network, a response message indicating that the called user identification information is incomplete when determining that the called user identification information is incomplete.

19. The call connection system of claim 18, wherein

The calling network is further configured to update the called user identification information according to the response message, and send the updated called user identification information to the called network ingress network element.

20. A call connection system in an IMS, comprising: a calling network and a called network, wherein the calling network comprises a service-call of an overlapping code-issuing terminal, a calling network access network element, and a calling network. Session control function; the called network includes the called network access network element; the service-call session control function of the calling network is connected with the called network access network element;

among them:

An overlapping code transmitting terminal, configured to send the called user identification information to the calling network access network element; the calling network accessing network element, configured to access the overlapping code sending terminal to the IMS network, and the called user The identification information is carried in the session request, and the session request is sent to the service-call session control function of the calling network; a service-call session control function of the calling network, configured to route the session request to the called network access network element;

The called network access network element is configured to, when determining that the called user identification information is incomplete, send a response message indicating that the called user identification information is incomplete to the service-call session control function of the calling network. .

The call connection system in the IMS according to claim 20, wherein the called network access network element is further configured to carry, in the response message, the called network to the called user identification information. demand information.

The call connection system in the IMS according to claim 20, wherein the called network further comprises a service-call session control function of the called network;

The calling network access network element further receives the dialing and receiving number of the overlapping code transmitting terminal, and determines, according to the demand information of the called user identification information of the called network, that the called user identification information needs to be needed, Sending a session request to the called network access network element again;

The called network access network element is configured to, when determining that the called user identification information is complete, routing the resent the session request to a service-call session control function of the called network;

The service-call session control function of the called network is used to implement the routing of the resented session request from the connection that implements the session request.