CN100544356C - A kind of protocol interconnection entity is to the mapping method of superposition transmitting-receiving code signalling - Google Patents

Abstract

The invention discloses the mapping method of a kind of protocol interconnection entity to superposition transmitting-receiving code signalling, may further comprise the steps: an IWU receives enough numbers when being enough to judge route, sends the INVITE request to the 2nd IWU or sip server; The 2nd IWU or sip server send IAM information to called PSTN side, and IAM information is generated according to IAM that receives and SAM by an IWU; When the one IWU receives follow-up SAM, send the INFO request to the 2nd IWU or sip server, From tag, the Call-ID of INFO request, To are identical with From tag, Call-ID, To in the INVITE request, and the called number in the Request-line field that INVITE request and INFO ask is all numbers of the IWU caller PSTN side transmission of temporarily receiving; The 2nd IWU or sip server send SAM to called PSTN side, and return 200 responses and give an IWU.Carried out the OVERLAP signaling of ISUP and the mutual mapping between the SIP/SIP-I signaling by IWU among the present invention, guaranteed that signaling can pass through a plurality of IWU, implementation method is simple, and it is few to take resource.

Description

A kind of protocol interconnection entity is to the mapping method of superposition transmitting-receiving code signalling

Technical field

The present invention relates to the signaling mapping method in the communication apparatus, particularly a kind of by SIP (SessionInitiation Protocol, Session initiation Protocol) message mechanism in is realized the mapping method of IWU (Interworking Unit, protocol interconnection entity) to OVERLAP (superposition transmitting-receiving code) signaling.

Background technology

Stipulated the signaling interface between the sip server among the RFC3261 (Request for Comments:3261, publish in June, 2002, the 10.1st joint, the 56th～57 page).ITU organizes the TRQ.2815 of promulgation and has Q.1912.5 stipulated to carry between the IWU SIP signaling interface (SIP-I) of ISUP (ISDN User Part, ISDNYong Hubufen) information.When the wherein either party of the calling and called of calling out is PSTN (PublicSwitched Telephone Network, the public switched telephone network network) user, and call signaling requires IWU the ISUP signaling can be mapped to the SIP/SIP-I signaling during through at least two IWU, and vice versa.

But working as the calling subscriber is PSTN user, and this user end office (EO) implements the OVERLAP number receiving mode to it; IAM (Initial Address Message from PSTN network destined IWU, initial address message) message has only been carried a part of called number, follow-up called number will carry successively in SAM (Subsequent AddressMessage, Subsequent Address Message SAM) message.At present at RFC3578 (Request forComments:3578, publish in August, 2003) and Q.1912.5 in defined the mechanism that the Overlap message of ISUP is shone upon to sip message, the shortcoming of this mechanism is to implement more complicated, takies the transaction layer resource of too much sip message.

Summary of the invention

The objective of the invention is to solve RFC3578 and Q.1912.5 in the Overlap message of ISUP of definition to the realization complexity of sip message mapping mechanism, take the too much shortcoming of resource, the mapping method of a kind of protocol interconnection entity to superposition transmitting-receiving code signalling is provided.

To achieve these goals, the invention provides the mapping method of a kind of protocol interconnection entity, be used for when the calling party is PSTN user, realizing carrying by sip message between a plurality of IWU the OVERLAP information of ISUP superposition transmitting-receiving code signalling, wherein, may further comprise the steps:

Step 1, the one IWU receives enough numbers when being enough to judge route, send the INVITE request to the 2nd IWU, the called number in the Request-line field of described INVITE request is all numbers that caller PSTN side that a described IWU temporarily receives sends;

Step 2, described the 2nd IWU sends IAM information to called PSTN side, and described IAM information is generated according to IAM that receives and SAM by a described IWU;

Step 3, when the one IWU receives follow-up SAM, send the INFO request to the 2nd IWU, From tag, the Call-ID of described INFO request, To are identical with From tag, Call-ID, To in the described INVITE request, and the called number in the Request-line field of described INFO request is all numbers of the described IWU caller PSTN side transmission of temporarily receiving;

Step 4, described the 2nd IWU sends SAM to called PSTN side, and returns 200 responses and give a described IWU.

Above-mentioned protocol interconnection entity is to the mapping method of superposition transmitting-receiving code signalling, and wherein, in the described step 1, a described IWU does not receive enough numbers when judging route, a first timer is set waits for and receive follow-up SAM.

Above-mentioned protocol interconnection entity is to the mapping method of superposition transmitting-receiving code signalling, and wherein, in the described step 3, the 2nd IWU is provided with a second timer when waiting for follow-up number, and described second timer is overtime, and the 2nd IWU returns 484 responses, and call release.

Above-mentioned protocol interconnection entity wherein, also comprises step to the mapping method of superposition transmitting-receiving code signalling between described step 3 and the step 4:

The 2nd IWU is according to From tag and Call-ID in the INFO request, find corresponding call instance, and judge whether the number among the Request-URI of INFO request is longer than the length of all numbers of having received, if not, 200 responses returned to a described IWU; If then further whether all numbers of having received of judgement are subclass of number among the Request-URI of INFO request, if not, return 200 responses and give a described IWU; If from the ISUP encapsulation, take out SAM, and enter described step 4.

Above-mentioned protocol interconnection entity wherein, also comprises step to the mapping method of superposition transmitting-receiving code signalling:

Described the 2nd IWU receives the ACM that called PSTN side user sends, and sends to calling party PSTN side by a described IWU;

Described the 2nd IWU receives the ANM that called PSTN side user sends, and sends to calling party PSTN side by a described IWU.

Among the present invention, carried out the OVERLAP signaling of ISUP and the mutual mapping between the SIP/SIP-I signaling by IWU, guaranteed that the OVERLAP signaling can pass through a plurality of IWU, implementation method is simple, and it is few to take resource.

The present invention is described in detail below in conjunction with accompanying drawing and specific embodiment.

Description of drawings

Fig. 1 is PSTN user for calling and called of the present invention, adopts the message related to calls flow process figure of OVERLAP number receiving mode.

Embodiment

The invention provides the method that a kind of message mechanism that uses Session Initiation Protocol realizes that IWU carries out the OVERLAP signaling message of ISUP.

When IWU receives IAM message from calling party PSTN1, if existing number also is not enough to determine route, timer is set then, wait for follow-up SAM; When IWU receives enough numbers when being enough to judge route, send the INVITE request to adjacent IWU or sip server, the called number in its Request-line (request row) field is all numbers of current I WU (being IWU1) the PSTN1 side of receiving;

When IWU1 receives follow-up SAM, send the INFO request to adjacent IWU/SIP server I WU2, identical among the From of this INFO (comprising tag), Call-ID, To and the INVITE, content in the ISUP encapsulation is SAM, and the called number in its Request-line field is all numbers that current I WU receives the PSTN side;

IWU/SIP server I WU2 receives the INVITE from adjacent IWU1, as thinks that number is incomplete, and timer is set, and waits for follow-up number; When receiving follow-up INFO request (having identical Call-ID and From Tag),, in conjunction with the called number that has received, analyze follow-up number information, the replacement timer according to the called number information among the Request-line with INVITE before; When receiving enough numbers, get final product further route; As timer expiry, IWU should return 484 responses, and call release;

If IWU1 receives the INFO request that has encapsulated SAM message again after the PSTN network has sent IAM message, then will do it to be mail to the PSTN network, and carry out last processing after the relevant treatment to SAM message.

Calling and called all are PSTN user, adopt message related to calls flow process figure such as Fig. 1 of OVERLAP number receiving mode, and the message mechanism of utilization Session Initiation Protocol of the present invention realizes that IWU specifically may further comprise the steps the method that the OVERLAP signaling message of ISUP shines upon:

Step 111, IWU1 receives IAM message, and timer is set when existing numbers is not enough to determine route, and enters step 112, directly enters step 113 if existing numbers is enough to determine route;

Step 112, IWU1 receives follow-up SAM message, is enough to determine route up to existing number;

Step 113, IWU1 sends INVITE to IWU2, portability SDP information (having described the IWU1 media capability of the media gateway of control down) wherein, must encapsulate IAM information simultaneously, IAM and a plurality of SAM information that this IAM information is received by the IWU1 basis, adopt specific local policy to generate, the method that specifically generates is referring to " SIP of China Telecom is obedient to standard ";

Step 114, IWU2 determines route according to existing number, and sends the IAM request to PSTN2;

Step 115, PSTN1 sends SAM message to IWU1, and wherein SAM message has been carried called follow-up number;

Step 116 when IWU1 receives follow-up SAM, is sent INFO, identical among the From tag of this INFO and first INVITE of Call-ID and To, and the content in the ISUP encapsulation is SAM;

Step 117 when IWU2 receives INFO, according to From tag and Call-ID, finds corresponding call instance; Judge whether the number among the Request-URI of INFO is longer than the length of all numbers of having received, if not, it is slow excessively to illustrate that then this INFO arrives IWU2, enters step 118; If then further whether all numbers of having received of judgement are subclass of number among the Request-URI of INFO, if not, illustrate that this INFO has problem, enters step 118; If from the ISUP encapsulation, take out SAM; Mail to PSTN2 after adopting specific local policy to handle, referring to " SIP of China Telecom is obedient to standard "; When waiting for follow-up number, as timer expiry, IWU should return 484 responses, and call release;

Step 118, IWU2 returns 200 responses to IWU1 simultaneously;

Step 119 arrives step 122: to the processing of follow-up SAM repeating step 115 to step 118, dispose up to all follow-up SAM;

In the step 123, IWU2 receives the ACM (Address Complete Message, Address Complete Message) from PSTN2;

Step 124, IWU2 is encapsulated in ACM message in 180 message, mails to IWU1;

Step 125, IWU1 obtains ACM information from 180 message, mail to PSTN1 after handling;

Step 126, IWU2 receives the ANM (Answer Message, response message) from PSTN2;

Step 127, IWU2 is encapsulated in ANM in 200 message, mails to IWU1;

Step 128, IWU1 obtains ANM information from 200 message, mail to PSTN1 after handling;

So far, call setup.

Among the present invention, carried out the OVERLAP signaling of ISUP and the mutual mapping between the SIP/SIP-I signaling, guaranteed that the OVERLAP signaling can pass through a plurality of IWU by IWU.

Adopt this method can guarantee that caller is PSTN user, the calling of adopting the OVERLAP mode to collect the digits by a plurality of IWU the time, can successfully be carried out.

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (5)

1, a kind of protocol interconnection entity is to the mapping method of superposition transmitting-receiving code signalling, be used for when the calling party is PSTN user, realize carrying by the Session initiation Protocol sip message between a plurality of protocol interconnection entity IWU the superposition transmitting-receiving code OVERLAP information of ISDNYong Hubufen ISUP, it is characterized in that, may further comprise the steps:

Step 1, the one IWU receives enough numbers when being enough to judge route, send the INVITE request to the 2nd IWU, the called number in the Request-line field of described INVITE request is all numbers that caller PSTN side that a described IWU temporarily receives sends;

Step 2, described the 2nd IWU sends initial address message IAM information to called PSTN side, and described IAM information is generated according to IAM that receives and Subsequent Address Message SAM SAM by a described IWU;

Step 3, when the one IWU receives follow-up SAM, send the INFO request to the 2nd IWU, the calling label F rom tag of described INFO request, call identification Call-ID, called call tag To are identical with From tag, Call-ID, To in the described INVITE request, and the called number in the request row Request-line field of described INFO request is all numbers of the described IWU caller PSTN side transmission of temporarily receiving;

Step 4, described the 2nd IWU sends SAM to called PSTN side, and returns 200 responses and give a described IWU.

2, protocol interconnection entity according to claim 1 is to the mapping method of superposition transmitting-receiving code signalling, it is characterized in that, in the described step 1, a described IWU does not receive enough numbers when judging route, a first timer is set waits for and receive follow-up SAM.

3, protocol interconnection entity according to claim 1 is to the mapping method of superposition transmitting-receiving code signalling, it is characterized in that, in the described step 3, described the 2nd IWU is when waiting for the INFO request that a described IWU sends, one second timer is set, described second timer is overtime, and the 2nd IWU returns 484 responses, and call release.

4, protocol interconnection entity according to claim 3 is characterized in that the mapping method of superposition transmitting-receiving code signalling, also comprises step between described step 3 and the step 4:

The 2nd IWU is according to From tag and Call-ID in the INFO request, find corresponding call instance, and judge whether the number among the Request-URI of INFO request is longer than the length of all numbers of having received, if not, 200 responses returned to a described IWU; If then further whether all numbers of having received of judgement are subclass of number among the Request-URI of INFO request, if not, return 200 responses and give a described IWU; If from the ISUP encapsulation, take out SAM, and enter described step 4.

5, according to claim 1,2 or 4 described protocol interconnection entities mapping method, it is characterized in that, also comprise step after the described step 4 superposition transmitting-receiving code signalling:

Described the 2nd IWU receives the ACM that called PSTN side user sends, and sends to calling party PSTN side by a described IWU;

Described the 2nd IWU receives the ANM that called PSTN side user sends, and sends to calling party PSTN side by a described IWU.

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