CN1889542B - Internetwork calling continuing method - Google Patents

Abstract

The invention relates to communication technology, and discloses a call connection method between networks, which can more conveniently avoid the loss of called information during cross-network calls. In the present invention, if there is no one-to-one correspondence between the called identifiers in the two networks, the gateway device will package the called identifiers in the first network in the second network when connecting the call signaling from the first network to the second network. In the relevant signaling of the network. In order to store the called party ID in the first network, new information elements may be added, original information elements may be extended, or original information elements may be reused in related signaling of the second network.

Description

Inter-network call connection method

technical field

The invention relates to communication technology, in particular to cross-network call connection technology. the

Background technique

With the rapid development of communication technology, people's expectations and requirements for communication are getting higher and higher. The characteristics of high bandwidth, multi-service and high quality of the third generation (3rd Generation, referred to as "3G") mobile communication system are very attractive. the consumer market. the

In the 3G network architecture, the mobile network is no longer limited to circuit switching. Various networks such as the packet domain and the Internet Protocol (Internet Protocol, referred to as "IP") multimedia subsystem have emerged as the times require. Both the circuit domain and the packet domain have their own functions and characteristics. The circuit domain is mainly used to provide connections of circuit-type services to users, and the packet domain is used to provide connections of packet-type services to users. the

To achieve intercommunication between different types of networks, gateway devices with cross-network call connection capabilities must be provided, such as trunk gateways with Media Gateway Control Function (MGCF for short), and access gateway control functions (Access Gateway ControlFunction, referred to as "AGCF") access gateway, etc. the

User IDs are encoded in different ways across different types of networks. For example, in the circuit domain, the user ID is "1133889"; in the packet domain, the user ID is "168server.telecom.com". The corresponding relationship between the user IDs in the circuit domain and the packet domain is stored in the user ID comparison query device. Specifically, the user identification comparison and query device stores the user or network identification comparison relationship of two or more network domains, accepts the query application and returns the result. Commonly used user identification comparison query devices include electronic numbering (Electronic Numbering, referred to as "ENUM server") server, domain name service system (DOMAIN NAME SYSTEM, referred to as "DNS") server, etc. the

The ENUM server is a server that combines the most widely used telephone number, Internet domain name address, and e-mail address in the world's communications, making it more convenient and flexible for people to carry out various telecommunication communications. The combination method is to combine the telephone number numbering standard formulated by the International Telecommunications Union (International Telecommunications Union, referred to as "ITU") with the domain name address rules used on the Internet, use DNS to store the telephone number, and then further use a telephone number in the domain name system The method of searching for available services in the Internet allows the phone number to be combined with the domain name and e-mail address, and the user can carry out various communications with only one phone number. the

At present, when a call is established between different networks, it is necessary to convert the called user ID in the call. For example, when a gateway device with cross-network call connection capability receives a call from the CS domain, it will use the called user ID in the CS domain to compare the user ID with the query device to query its corresponding PS domain user ID, and the user The identification comparison query device returns the query result to the gateway device, and the gateway device initiates a call to the packet domain. For example, when the gateway device receives a call in the circuit domain, and the called user ID of the call is "1680110", the gateway device inquires the corresponding user ID in the packet domain in the user ID comparison query device. If the user ID in the corresponding group domain is "168server.telecom.com", then the query device returns "168server.telecom.com" to the gateway device, and the gateway device uses "168server.telecom.com" as the Initiates a packet domain call for the called party ID of the call. Its process is shown in Figure 1. the

In step 101, the circuit domain sends call signaling to the gateway device MGCF capable of cross-network call connection for cross-domain connection, and the signaling carries the called user identifier "1680110";

In step 102, using the called user identification in the circuit domain as an index, the user identification comparison query device is used for querying;

In step 103, the user ID returns a response message after completing the query against the query device, which includes the query result, that is, the user ID "168server.telecom.com" of the corresponding grouping domain;

In step 104, the MGCF proceeds with the query result as the called user identification of the call signaling in the packet domain. . the

Those skilled in the art can understand that, according to the above processing method, after the gateway device converts the user ID, the call signaling initiated to the packet domain only includes the user ID in the packet domain. However, in the user ID matching query device, sometimes the user IDs in the circuit domain and the packet domain are one-to-many, that is, user IDs in different circuit domains may correspond to the same user ID in the packet domain. Therefore, the method of only using the user identifier in the packet domain as the called user identifier may cause the loss of the called user information. the

But on the other hand, if a user ID in the packet domain is set to correspond to each user ID in the CS domain, the network will correspondingly add a lot of management functions, thereby increasing the network burden. the

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for connecting calls between networks, so that it is more convenient to avoid the loss of called party information when calling across networks. the

To achieve the above object, the present invention provides a method for connecting calls between networks, comprising the following steps:

When connecting the cross-network call signaling from the first network to the second network, the gateway device sets information representing the called identity in the first network in the first information element of the related call signaling of the second network; the related call The information representing the called identity in the second network is set in the signaling at the same time;

When processing the related call signaling of the second network, the initial call object of the calling user can be determined in combination with the called identifier in the signaling and the information in the first information element. the

Wherein, when the gateway device connects the cross-network call signaling from the first network to the second network, it also includes the step of judging whether there is a one-to-one correspondence between the called identifier in the first network and the called identifier in the second network , if there is no one-to-one correspondence between the called ID in the first network and the called ID in the second network, set the ID representing the called ID in the first network in the first information element of the relevant call signaling of the second network information. the

In addition, in the method, the first information element is a newly added information element in the call signaling. the

In addition, in the method, the first information element is implemented by extending an original information element in the call signaling. the

In addition, in the method, the first information element is implemented by reusing an original information element in the call signaling. the

Furthermore, in the method, when the call signaling is session initiation protocol signaling, the reused information element may be a "To" header field. the

In addition, in the method, when the call signaling is session initiation protocol signaling, the reused information element may be a "P-Called-Party-ID" header field. the

Furthermore, in the method, when the call signaling is ISDN user part signaling, the reused cell is a "UUI" cell. the

Furthermore, in the method, the call signaling may be a session initiation protocol or an ISDN user part protocol. the

In addition, in the method, the first network is a packet domain network, and the second network is a circuit domain network; or,

The first network is a circuit domain network, and the second network is a packet domain network. the

Through comparison, it can be found that the main difference between the technical solution of the present invention and the prior art is that if the called identifiers in the two networks cannot correspond one-to-one, the gateway device is performing call signaling connection from the first network to the second network. , the called party ID in the first network is packaged in the relevant signaling of the second network. In order to store the called party ID in the first network, new information elements may be added, original information elements may be extended, or original information elements may be reused in related signaling of the second network. the

The difference in this technical solution brings obvious beneficial effects, that is, because the called party identification in the first network is retained in the cell of the second network-related signaling, the original called party information is retained, This makes it possible to determine the initial calling party of the calling user in subsequent processing. the

Description of drawings

Fig. 1 is a schematic flow diagram of a call connection method between networks in the prior art;

Fig. 2 is the schematic flow chart of the inter-network call connection method according to the principle of the present invention;

Fig. 3 is a schematic flow diagram of a call connection method between networks according to a first embodiment of the present invention;

FIG. 4 is a schematic flow diagram of a method for connecting calls between networks according to a second embodiment of the present invention;

Fig. 5 is a schematic flowchart of a method for connecting a call between networks according to a third embodiment of the present invention. the

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. the

In general, the core of the present invention can be embodied by FIG. 2 . As shown in FIG. 2 , first at step 201 , the first network sends call signaling to the gateway device MGCF for cross-domain connection, wherein the call signaling carries the called identifier "1680110" of the first network. If there is no one-to-one correspondence between the called party ID in the first network and the called party ID in the second network, step 202 is performed, and the MGCF takes the called party ID of the first network as an index, and compares it with a user ID such as an ENUM server The inquiring device (hereinafter all take "ENUM server" as an example) inquires the called party identity of its corresponding second network; after completing the inquiry, in step 203, the ENUM server returns a response message to the MGCF, which includes the query result " 168server.telecom.com", that is, the called identifier of the corresponding second network. Next, in step 204, the MGCF uses the query result as the called party identifier in the second network call signaling to make a connection, and the first information element of the second network call signaling is also set with the The original called ID is "1680110". Thus, when processing the call signaling of the second network, the calling party's initial call object can be determined in combination with the called identifier "168server.telecom.com" in the signaling and the information "1680110" in the first cell , so that the initial calling party of the calling user can be determined in subsequent processing, and the problem of called information loss during cross-network calling can be avoided. In order to pack the called identifier "1680110" in the first network into the call signaling of the second network, the present invention adds new information elements, or extends original information elements, or reuses the original cell. the

The inter-network call connection method according to the first embodiment of the present invention is shown in Fig. 3. This figure takes the IMS domain network and the circuit domain network as examples to illustrate the principle of the present invention, through the call signaling in the IMS domain network A new cell is added in the scheme to save the called party ID in the circuit domain network. the

As shown in Figure 3, first, in step 301, the circuit domain network sends call signaling to the MGCF, that is, an initial address message (Initial Address Message, "IAM") for cross-domain connection. The called party identifier "1680110" of the CS domain network is carried in the call signaling. the

Since the called party ID of the circuit domain network cannot correspond to the called party ID of the IMS domain network in this embodiment, in step 302, the MGCF uses the called party ID "1680110" of the circuit domain network as an index to query the corresponding ID of the ENUM server. The called identifier of the IMS domain network; after completing the query, in step 303, the ENUM server returns a response message to the MGCF, which includes the query result "168server.telecom.com", which is the corresponding called identifier of the IMS domain network . the

Thereafter, in step 304, the MGCF uses the query result "168server.telecom.com" as the called identifier in the IMS domain network call signaling to make a connection, and the IMS domain network call signaling is also set with the CS domain network call signaling The original called ID "1680110". Specifically, in this step, the REQUESTURI in the "INVITE" message is filled with the result "168server.telecom.com" returned by the ENUM server, and a new information element - "OTHERDOMAINNUMBER" header field is added to the signaling, Fill in the called ID "1680110" of the CS domain network. After the subsequent service server receives the call, it can judge the service type according to the original called identifier. It should be pointed out that those skilled in the art can understand that the so-called new addition means that a new information element is newly added, and the name and semantics of the information element are different from other existing information elements in the signaling. the

Thereafter, when the call signaling of the IMS domain network is processed, the original call object of the calling user can be determined in conjunction with the called identifier in the IMS domain call signaling in the signaling and the information in the newly added "OTHERDOMAINNUMBER". In this case, since the original called party information is retained in the call signaling of the IMS domain network, it is possible to determine the initial calling party of the calling user in subsequent processing. the

The inter-network call connection method according to the second embodiment of the present invention is shown in Fig. 4. This figure takes the IMS domain network and the circuit domain network as examples to illustrate the principle of the present invention, when the call signaling is a session initiation protocol (Session Initation Protocol, referred to as "SIP"), by reusing the original "P-Called-Party-ID" header field in the call signaling to save the scheme of the called party ID in the first network. the

As shown in FIG. 4 , first, in step 401 , the circuit domain network sends call signaling, that is, an initial address message (IAM) to the MGCF for cross-domain connection. The called party identifier "1680110" of the CS domain network is carried in the call signaling. the

In this embodiment, the called party ID of the circuit domain network cannot correspond to the called party ID of the IMS domain network, so in step 402, the MGCF uses the called party ID "1680110" of the circuit domain network as an index to query the ENUM server for its corresponding The called party ID of the IMS domain network; after completing the query, in step 403, the ENUM server returns a response message to the MGCF, and the response message contains the query result "168server.telecom.com", which is the called party of the corresponding IMS domain network. logo. the

Thereafter, in step 404, the MGCF uses the query result "168server.telecom.com" as the called identifier in the IMS domain network call signaling to make a connection, and the IMS domain network call signaling is also set with the CS domain network call signaling The original called ID "1680110". Specifically, in this step, the REQUESTURI in the "INVITE" message is filled with the result "168server.telecom.com" returned by the ENUM server, and the circuit is filled in the "P-Called-Party-ID" header field of the message The called party ID of the domain network is "1680110". the

Afterwards, when processing the call signaling of the IMS domain network, the called party identifier "168server.telecom.com" in the IMS domain call signaling and the "P-Called-Party-ID" header field in the signaling can be combined The information "1680110" of the caller determines the initial caller of the calling user. In this case, since the original called party information is retained in the call signaling of the IMS domain network, it is possible to determine the initial calling party of the calling user in subsequent processing. the

It should be pointed out that in this embodiment, when the call signaling is session initiation protocol signaling, the original "P-Called-Party-ID" header field in the call signaling is used to save the CS domain network The called identifier, but the present invention is not limited thereto. In other embodiments, the called identifier of the circuit domain network can also be saved by reusing the original "To" header field in the call signaling. Those skilled in the art can understand that the so-called reuse means that the original information elements in the signaling are used in a new field or scenario while keeping the semantics unchanged. the

The inter-network call connection method according to the third embodiment of the present invention is shown in Figure 5. This figure takes the IMS domain network and the circuit domain network as examples to illustrate the principles of the present invention. When the network user part (ISDN User Part, referred to as "ISUP"), by reusing the original "UUI" information element in the call signaling where it is located, the scheme of saving the called identity in the first network. the

As shown in FIG. 5, firstly, in step 501, the IMS domain network sends call signaling, ie, an "INVITE" message, to the MGCF for cross-domain connection. The called identifier "Myaddrhuawei.com" of the CS domain network is carried in the call signaling. the

Since the called party ID of the IMS domain network cannot correspond to the called party ID of the circuit domain network in this embodiment, in step 502, the MGCF uses the called party ID "Myaddrhuawei.com" of the IMS domain network as an index to query the ENUM server for its The corresponding called party ID of the circuit domain network; after completing the query, in step 503, the ENUM server returns a response message to the MGCF, and the response message includes the query result "1681110", which is the corresponding called party ID of the circuit domain network. the

Thereafter, in step 504, the MGCF uses the query result "1681110" as the called party ID in the CS domain network call signaling to make a connection, and the original called party ID of the IMS domain network call signaling is also set in the CS domain network call signaling. Identify "Myaddrhuawei.com". Specifically, in this step, fill in the result "1681110" returned by the ENUM server in the initial address message (IAM), and fill in the called identity of the IMS domain network "Myaddrhuawei" in the "UUI" information element of the message. .com". the

Afterwards, when processing the call signaling of the circuit domain network, the callee ID "1681110" in the circuit domain call signaling and the information "Myaddrhuawei.com" in the "UUI" information element can be combined to determine the calling party. Call the user's original caller. In this case, since the original called party information is retained in the call signaling of the circuit domain network, it is possible to determine the initial calling party of the calling user in subsequent processing. the

The above describes the call signaling processing of the circuit domain network. When processing the call signaling of the packet domain network, this embodiment also saves the information of the packet domain network by reusing the original "UUI" information element in the call signaling. Called ID. the

It should be pointed out that, according to the principle of the present invention, in addition to reusing the original cells in the call signaling and increasing the cells in the call signaling, the original network can also be preserved by extending the original cells in the call signaling. The purpose of the called identification. the

Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the present invention. The spirit and scope of the invention. the

Claims (10)

1. A method for connecting a call between networks, comprising the following steps: When connecting the cross-network call signaling from the first network to the second network, the gateway device sets information representing the called identity in the first network in the first information element of the related call signaling of the second network; the related call Information representing the called identity in the second network is set in the signaling at the same time; When processing the related call signaling of the second network, combine the information representing the called identity in the second network in the signaling and the information representing the called identity in the first network in the first information element to determine that the calling party initially the calling object. 2. The inter-network call connection method according to claim 1, wherein when the gateway device connects the cross-network call signaling from the first network to the second network, it also includes judging the called party in the first network Whether the identification and the called identification in the second network can be one-to-one correspondence, if the called identification in the first network and the called identification in the second network cannot be in one-to-one correspondence, then in the relevant call information of the second network Information representing the called party's identity in the first network is set in the first information element of the order. 3. The inter-network call connection method according to claim 1, wherein the first information element is a newly added information element in the call signaling. 4. The inter-network call connection method according to claim 1, wherein the first cell is implemented by expanding an original cell in the call signaling. 5. The method for connecting a call between networks according to claim 1, wherein the first cell is implemented by reusing an original cell in the call signaling. 6. The inter-network call connection method according to claim 5, wherein when the call signaling is session initiation protocol signaling, the reused information element is a "To" header field. 7. The inter-network call connection method according to claim 5, wherein when the call signaling is session initiation protocol signaling, the reused information element is "P-Called-Party-ID" header field. 8. The inter-network call connection method according to claim 5, wherein when the call signaling is ISDN user part signaling, the reused cell is a "UUI" cell. 9. The inter-network call connection method according to claim 3 or 4, characterized in that the call signaling is a session initiation protocol or an ISDN user part protocol. 10. The inter-network call connection method according to any one of claims 1 to 8, wherein the first network is a packet domain network, and the second network is a circuit domain network; or, The first network is a circuit domain network, and the second network is a packet domain network.

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