CN1852237A

CN1852237A - Method and system for realizing random address space UE communication

Info

Publication number: CN1852237A
Application number: CNA2005101082495A
Authority: CN
Inventors: 张光华
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-10-08
Filing date: 2005-10-08
Publication date: 2006-10-25
Anticipated expiration: 2025-10-08
Also published as: CN100421421C

Abstract

The method sets up MEN interconnected to each network. The method further includes procedures: (1) in procedure of building conversation, obtaining user equipment (UE) of calling and called parties as well as address space id of MEN; (2) based on relation between calling, called UE and address space of MEN, assigning mapping addresses and ports for calling and/or called UE; and saving binding record between mapping addresses and ports of calling and/or called UE and original addresses and ports; (3) before forwarding media stream of UE to opposite end, based on the said binding record to convert source IP address and port and/or destination IP address and port in IP head, and sending them to opposite ends through MEN. The invention also discloses system for implementing intercommunication of UE at any address space. The invention realizes intercommunication between calling UE and called UE in different address spaces without need of modifying UE.

Description

A kind of method and system that realize random address space UE communication

Technical field

The present invention relates to communication technical field, relate in particular to a kind of method and system that realize random address space UE communication.

Background technology

IM CN subsystem (IMS) is the present communications field a kind of system relatively more commonly used.The configuration of IMS entity as shown in Figure 1.

The network architecture that comprises the IMS entity then as shown in Figure 2, wherein, GPRS network connects Access Network (IP-CAN) as IP.The IP address of UE is distributed by IP-CAN operator, such as, the IP address that GPRS UE uses when inserting is the Gateway GPRS Support Node in the GPRS network (GGSN) IP address allocated.As seen from Figure 2, Proxy-Call Session Control Function (P-CSCF) module is the first contact point of user in IMS; Inquiry-CSCF (I-CSCF) module is a contact point among the mobile network, when the target that connects is the contracted user of this Virtual network operator, perhaps target is the roamer who is positioned at current operator service area, and conversation initialized protocol (SIP) session can be used the I-CSCF of this network; Service-CSCF (S-CSCF) module is carried out the session control service for the user, and as a SIP greffier (Registrar).

It can also be seen that by Fig. 2 the IMS Business Stream is processed on two levels respectively, promptly transmit SIP and SDP message,, be specially the SIP sig. among Fig. 2 to set up session at control plane (C-Plane); And, be specially the User traf. among Fig. 2 in user plane (U-Plane) transmission end user traffic flow.

Control plane comprises the communication of LA Management Room and the communication of UE and P-CSCF intermodule.The session that can realize alternately by control plane is set up, and set up in the process in session, calling UE and called UE will after the Media Stream source address and the port that will use fill among the SDP calling UE and called UE and address and port that the address among the SDP that receives and port are flowed as the opposite end receiving media.Communication between user plane is the media flow transmission between the communication two party, specifically can use the agreement of RTP and so on.After the session of control plane was set up, caller and called UE began at user plane transmitting-receiving Media Stream.

Because the UE as communication two party may be positioned at different address spaces, be arranged in the different networks that operator provided in other words, therefore the UE in two address spaces need set up session, this just requires can be the adequate types address that can be used for communicating in the IP address among the SDP offers/answer that control plane is guaranteed to communicate between the UE of two operators, may need to distribute the mapping address and the port of certain suitable communication for this reason, and set up address mapping relation with the original address and the port of UE appointment; At user plane, then need the IP address and the port of the Media Stream that exchanged between the UE are translated, make Media Stream can enter another network.

Specifically, for the UE that makes private ip v4 address can use the UE communication of private ip v4 address or publicly-owned IPv4 address with other, present scheme is the site deployment network address translation (nat) function device at IP-CAN access server place, as shown in Figure 3, and the private ip v4 address of UE being filled in SDP by NAT and the port modifications publicly-owned address and the port that distribute for this NAT, to carry out communication by publicly-owned address and port.In fact, if these two private ip v4 addresses are positioned at consolidated network, these two directly communications of UE so, but, still need the conversion of executive address and port based on such scheme, obviously this there is no need.And this scheme need be provided with NAT, and a NAT may be set at each access server place, obviously needs the more cost of cost like this.

Be the UE and other UE communication of using the IPv6 address that make publicly-owned IPv4 address, present scheme is that an entity that is called SIP Edge Proxy is set.Sip message between IPv4 UE and IPv6 UE all passes through this entity, this entity checks whether IPv6 UE needs to interrogate with IPv4 Netcom, if, then this entity is IPv6 UE distributing IP v4 address and port, and be notified to IPv6 UE, but do not revise the SDP in the INVITE, IPv6 UE is provided with this IPv4 address and port in the SDP of the INVITE that sends again offer afterwards, and IPv4 UE then uses IPv4 address and the port in this SDP offer message to carry out follow-up processing.But still there is defective in this scheme: need IPv6 UE to support the SIP expansion; Increase IPv6 UE and internetwork interaction times, increased the settling time of session; This scheme at be communication between internet terminal and mobile network IPv6 UE, if use the UE of private ip v4 address to communicate by letter with IPv6 UE, then can't directly use this scheme to realize, and also can't realize the intercommunication of the UE of the UE of private ip v4 address and publicly-owned IPv4 address.

Summary of the invention

In view of this, subject matter to be solved by this invention is to provide a kind of method that realizes random address space UE communication, so that can transmit Media Stream mutually between the heterogeneous networks.

The present invention also provides a kind of system that realizes random address space UE communication simultaneously.

For overcoming the above problems, the invention provides following technical scheme:

A kind of method that realizes random address space UE communication of the present invention, the middle switching network MEN of setting and each network interconnection, this method further may further comprise the steps:

A. set up in the process in session, obtain the address space identifier (ASID) of calling terminal UE and called UE, and the address space identifier (ASID) of obtaining MEN;

B. according to the relation of the address space of calling UE, called UE and MEN, be calling and/or called UE allocation map address and port, and preserve the mapping address of calling and/or called UE and the binding record of port and raw address and port;

C. before the Media Stream with UE is forwarded to the opposite end, according to the binding record of preserving the source IP address in the IP head and port and/or purpose IP address and port is changed, and this Media Stream is forwarded to the opposite end by MEN.

Among the described step b, the relation of described address space according to caller, called and MEN, for calling and/or called UE allocation map address and port are:

The address space of caller is not equal to called address space, and caller and called address space all are not equal to the address space of MEN, then be mapping address 1 and the port one of calling UE distribution with the MEN same address space, and the mapping address 2 of distribution and called UE same address space and port 2, and be mapping address 3 and the port 3 of called UE distribution, and the mapping address 4 of distribution and calling UE same address space and port 4 with the MEN same address space; The binding of described preservation mapping address and port and raw address and port is recorded as: preserve the corresponding relation of calling UE raw address and port and described mapping address 1 and port one, and preserve the corresponding relation of described mapping address 1 and port one and described mapping address 2 and port 2; And preserve the corresponding relation of called UE raw address and port and described mapping address 3 and port 3, and preserve the corresponding relation of described mapping address 3 and port 3 and described mapping address 4 and port 4;

Perhaps the address space of caller is not equal to called address space, and the called address space equals the address space of MEN, then be the mapping address and the port of calling UE distribution and MEN same address space, and be the mapping address and the port of called UE distribution and calling UE same address space; The binding of described preservation mapping address and port and raw address and port is recorded as: preserve the corresponding relation of calling UE raw address and port and described mapping address and port, and preserve the corresponding relation of called UE raw address and port and mapping address that is distributed and port;

Perhaps the address space of caller is not equal to called address space, and the calling address space equals the address space of MEN, then be the mapping address and the port of called UE distribution and MEN same address space, and be the mapping address and the port of calling UE distribution and called UE same address space; The binding of described preservation mapping address and port and raw address and port is recorded as: preserve the corresponding relation of called UE raw address and port and described mapping address and port, and preserve the corresponding relation of calling UE raw address and port and mapping address that is distributed and port;

Perhaps the address space of caller equals called address space, then is not implemented as calling and/or called UE allocation map address and port and follow-up step, and directly carries out forwards and media flow transmission, finishes this handling process afterwards.

The address space of caller is not equal to called address space, when caller and called address space all are not equal to the address space of MEN,

Called access zone network allows directly to enter present networks from the source address of the grouping of MEN, then be mapping address 1 and the port one of calling UE distribution with the MEN same address space, and be mapping address 3 and the port 3 of called UE distribution, and the mapping address 4 of distribution and calling UE same address space and port 4 with the MEN same address space; The binding of described preservation mapping address and port and raw address and port is recorded as: the corresponding relation of preserving calling UE raw address and port and described mapping address 1 and port one; And preserve the corresponding relation of called UE raw address and port and described mapping address 3 and port 3, and preserve the corresponding relation of described mapping address 3 and port 3 and described mapping address 4 and port 4;

Perhaps the permission of the access zone network of caller directly enters present networks from the source address of the grouping of MEN, then be mapping address 3 and the port 3 of called UE distribution with the MEN same address space, and be mapping address 1 and the port one of calling UE distribution, and the mapping address 2 of distribution and called UE same address space and port 2 with the MEN same address space; The binding of described preservation mapping address and port and raw address and port is recorded as: preserve the corresponding relation of calling UE raw address and port and described mapping address 1 and port one, and preserve the corresponding relation of described mapping address 1 and port one and described mapping address 2 and port 2; And the corresponding relation of preservation called UE raw address and port and described mapping address 3 and port 3;

Perhaps caller and called access zone network all allow directly to enter present networks from the source address of the grouping of MEN, then are respectively calling UE and called UE and distribute mapping address and port with the MEN same address space; The binding of described preservation mapping address and port and raw address and port is recorded as: preserve the corresponding relation of calling UE raw address and port and described mapping address and port, and preserve the corresponding relation of called UE raw address and port and described mapping address and port;

The address space of caller is not equal to called address space, when the called address space equals the address space of MEN, the caller access zone network allows directly to enter present networks from the source address of the grouping bag of MEN, then is mapping address and the port of calling UE distribution with the MEN same address space; The binding of described preservation mapping address and port and raw address and port is recorded as: the corresponding relation of preserving calling UE raw address and port and described mapping address and port;

The address space of caller is not equal to called address space, when the calling address space equals the address space of MEN, called access zone network allows directly to enter present networks from the source address of the grouping bag of MEN, then is mapping address and the port of called UE distribution with the MEN same address space; The binding of described preservation mapping address and port and raw address and port is recorded as: the corresponding relation of preserving called UE raw address and port and described mapping address and port.

This method further comprises: behind conversation end, and mapping address that distributes among the release steps b and port, and delete the binding record of being preserved.

Set in advance analyzer Px, distributor Allocator and IP address and port translation device IPAPT,

Described step a is realized by Px;

Among the step b, the relation of described address space according to calling UE, called UE and MEN, for calling and/or called UE allocation map address and port are:, be sent as the request of calling and/or called UE allocation map address and port to Allocator by the relation of Px according to the address space of calling UE, called UE and MEN; Allocator distributes corresponding mapping address and port according to the request of receiving.

Described Px is set in the session path between the called service call conversation control function S-CSCF module and called Proxy Call Session Control Function P-CSCF module.

Described Px is separately positioned in the session path between the terminating S-CSCF module and called P-CSCF module and originating S-CSCF module and caller P-CSCF module.

Described Px is set in the session path between the caller P-CSCF module and called P-CSCF module, perhaps is arranged between originating S-CSCF module and the terminating S-CSCF module.

The described Px of setting is: will inquire that entry point address is configured to the address of this Px, in the UE register flow path, the P-CSCF module sends to this Px according to described configuration with the request message of receiving, Px increases the address of oneself in the path P ATH of this message head, give the S-CSCF module with this forwards afterwards; As the response message process Px from the S-CSCF module, Px adds the address of oneself in the service route Service-Route head of response message to.

Among the described step a,

The address space identifier (ASID) that the described Px that is arranged on callee side obtains calling UE is:

Take out last address the address list of the record route Record-Route title head of the request INVITE that sends from calling UE, perhaps from the address list of the approach Via title head of this INVITE, take out the penult address, if the address unencryption that is obtained, then with the address of this address, and determine the address space identifier (ASID) of calling UE access zone network according to the corresponding relation of pre-configured P-CSCF module's address and address space identifier (ASID) as caller P-CSCF module; If the address encryption that is obtained then obtains network identity from encryption address, and according to the definite network address corresponding address space identification that is obtained of the corresponding relation of pre-configured network identity and address space identifier (ASID);

Describedly obtain the address space identifier (ASID) of calling UE or be: in Calling Side S-CSCF module and P-CSCF intermodule a logic function is set,

And this logic function increases the address space identifier (ASID) of calling UE access zone network in the INVITE that calling UE is sent, and Px visits the address space identifier (ASID) of carrying in this message the address space identifier (ASID) on ground as caller;

This logic function or the network identity that ground is visited in the increase caller in the INVITE that calling UE is sent, behind the network identity that Px carries, obtain the address space identifier (ASID) on caller visit ground again according to the corresponding relation of pre-configured network identity and address space identifier (ASID) in obtaining this message;

And/or the address space identifier (ASID) that the described Px that is arranged in callee side obtains called UE is: take out last address from the address list of INVITE Route title head, with the address of this address as called P-CSCF module, and the address space identifier (ASID) of obtaining called UE according to the corresponding relation of pre-configured P-CSCF module and address space identifier (ASID);

Describedly obtain the address space identifier (ASID) of called UE or be: the corresponding relation that Px address and the carrier network address space identifier (ASID) of UE location are set, when the UE that is positioned at certain carrier network carries out the Session initiation protocol SIP registration, Px revises on the session path that sip message is inserted into this Px this UE between the P-CSCF module and S-CSCF module by the Px address of using this carrier network correspondence, set up in the flow process in session, when Px receives from the sip message of S-CSCF module on this Px address, Px determines this carrier network address space identifier (ASID) according to set corresponding relation, and with the address space identifier (ASID) of this carrier network address space identifier (ASID) as UE.

Describedly be arranged on the address space identifier (ASID) that Calling Side Px obtains calling UE and be: obtain from the penult address in the Via title head of called sip message, with the address of this address, and determine the pairing address space identifier (ASID) of this caller P-CSCF module's address according to the corresponding relation of pre-configured P-CSCF module and address space identifier (ASID) as caller P-CSCF module;

Describedly obtain the address space identifier (ASID) of calling UE or be: the corresponding relation that Px address and the carrier network address space identifier (ASID) of UE location are set, when the UE that is positioned at carrier network carries out the SIP registration, Px revises on the session path that sip message is inserted into this Px this UE between the P-CSCF module and S-CSCF module by the Px address of using this carrier network correspondence, set up in the flow process in session, when Px receives from the sip message of S-CSCF module on this Px address, Px determines this carrier network address space identifier (ASID) according to set corresponding relation, and with this carrier network address space identifier (ASID) as the UE address space identifier (ASID);

Describedly obtain the address space identifier (ASID) of calling UE or be: obtain last address from penult address in the Via title head in the INVITE of caller or Record-Route title head, with the address of this address as called P-CSCF module, and the address space identifier (ASID) of obtaining called UE according to the corresponding relation of pre-configured P-CSCF module and address space identifier (ASID);

And/or the address space identifier (ASID) that the described Px that is arranged on Calling Side obtains called UE is: will be from first address among the Record-Route of called sip message, and the address unencryption that is obtained, then with the address of this address, and determine the address space identifier (ASID) of called UE access zone network according to the corresponding relation of pre-configured P-CSCF module's address and address space identifier (ASID) as called P-CSCF module; Perhaps has encrypted the address that is obtained, and then obtains network identity from encryption address, and according to the definite network identity corresponding address space identification that is obtained of the corresponding relation of pre-configured network identity and address space identifier (ASID).

The described Px of setting is: be that belonging area network identifies pairing address in the public user identity of UE with the address configuration of Px, the originating S-CSCF module is when follow-up forwarding INVITE, utilize the belonging area network identification information of called public user identity to search the pairing address of this information, afterwards this INVITE is sent to this address, Px is when transmitting message afterwards, oneself address is increased to the top of the Record-Route head of message.

Among the described step a, the address space identifier (ASID) that described Px obtains calling and called UE is: between caller and called P-CSCF module and S-CSCF module a logic function is set, and this logic function increases the address space identifier (ASID) of UE access zone network in sip message, and Px is with the address space identifier (ASID) of carrying in this message address space identifier (ASID) as this UE access zone network;

Perhaps be: last address in the Record-Route title head of taking-up sip message, with the address of this address as caller P-CSCF module, and the address space identifier (ASID) of obtaining calling UE according to the corresponding relation of pre-configured P-CSCF module and address space identifier (ASID); And take out top address in the Record-Route title head, with the address of this address as called P-CSCF module, and the address space identifier (ASID) of obtaining called UE according to the corresponding relation of pre-configured P-CSCF module and address space identifier (ASID).

Among the described step b, distribute corresponding mapping address and port according to the request of receiving after, further comprise: preserve calling UE and/or the raw address of called UE and the corresponding relation of port and mapping address and port.

This method further comprises: after definite session is released, and mapping address that release steps b distributed and port, and delete the corresponding relation of being preserved.

A kind of system that realizes random address space UE communication of the present invention, this system comprises the access zone network of calling UE and the access zone network of called UE, this system further comprises: Px, Allocator, IPAPT and with the MEN of each network interconnection, wherein,

Px is used to obtain the visit way address space identification of calling UE, called UE and the address space identifier (ASID) of MEN, and distributes corresponding mapping address and port according to the relationship request Allocator of these three address space identifier (ASID)s;

Allocator is used for distributing corresponding mapping address and port according to the request message received for calling and/or called UE, and forms the binding record, and formed binding is noted issue corresponding IPAPT;

IPAPT is used for the Media Stream of calling UE and called UE is transmitted between access zone network and MEN, and the raw address in the Media Stream and port and/or destination address and port are changed according to the binding record;

MEN is used at the access zone network address space of calling and called not simultaneously, and is interconnected by the access zone network of IPAPT and UE.

Described Px is arranged in the session path between the called service call session control S-CSCF module and called agent call session control P-CSCF module; Described Px or be arranged at respectively in the session path between the terminating S-CSCF module and called P-CSCF module and originating S-CSCF module and caller P-CSCF module.

Described Px is arranged in the session path between the caller P-CSCF module and called P-CSCF module, perhaps is arranged between originating S-CSCF module and the terminating S-CSCF module.

The P-CSCF module is further used for: in the UE register flow path, according to set in advance and request message is sent to Px for the inquiry entry point address of Px address;

Px is further used for: in the path P ATH of this message head, increases the address of this Px, and this message sent to the S-CSCF module, and the address that in the service route Service-Route head of the response message that the S-CSCF module is returned, increases this Px;

The S-CSCF module is further used for: return response message according to the message of receiving to Px.

The address of Px is that belonging area network identifies pairing address in the public user identity of UE in the described system;

The originating S-CSCF module is further used for: when transmitting INVITE, utilize the belonging area network identification information of called public user identity to search the pairing Px of this information address, afterwards this INVITE is sent to this address;

Px is further used for: when transmitting message, the address of this Px is increased to the top of the Record-Route head of message.

Described Px is further used for behind conversation end, request Allocator deletion mapping address and port information;

Described Allocator is further used for according to the mapping address of removal request deletion self preservation of Px and the relevant information of port, and the binding record of preserving among the order IPAPT deletion IPAPT.

Described Px is arranged between the S-CSCF module and P-CSCF module in the called access zone network, and be positioned on the terminating S-CSCF module, or be positioned on the called P-CSCF module, or on the I-CSCF module between S-CSCF module and the P-CSCF module, or on the newly-increased node between S-CSCF module and the P-CSCF module;

Described Px or be arranged at the terminating S-CSCF module respectively and called P-CSCF module between and between originating S-CSCF module and the caller P-CSCF module; And be positioned on the corresponding S-CSCF module, or be positioned on the corresponding P-CSCF module, or on the I-CSCF module between S-CSCF module and the P-CSCF module, or on the newly-increased node between S-CSCF module and the P-CSCF module;

Described Px or be arranged at called P-CSCF module and caller P-CSCF module between, and be positioned on the corresponding P-CSCF module, or be positioned on the corresponding S-CSCF module, or on the I-CSCF module between S-CSCF module and the P-CSCF module, or on the I-CSCF module between originating S-CSCF module and the terminating S-CSCF module, or on the newly-increased node between S-CSCF module and the P-CSCF module, or on the newly-increased node between originating S-CSCF module and the terminating S-CSCF module.

The present invention program is by the MEN of setting with each network interconnection, and to the relation of the address space of calling UE, called UE and MEN, be calling UE and/or called UE allocation map address and port, again the source address in the Media Stream and port and/or destination address and port are changed, afterwards this Media Stream is forwarded to the opposite end by MEN, when thereby the address space of having realized calling UE, called UE and MEN three was incomplete same, calling UE and called UE can communications, and need not to revise UE.

The present invention program and by when the address space of caller is identical with the called address space, directly carry out forwards and media flow transmission, make and belong to two UE of same address space when different access zone networks, the Media Stream of these two UE does not need the conversion through address and port, thereby realizes the user plane optimization security.

The present invention program's processing does not increase the signaling interaction times of UE and network, thereby the problem of session establishment time delay can not occur obviously increasing because of the signaling interaction times that increases UE and network in the prior art.

Px used in the present invention and Allocator can be provided by the third party, thereby each operator is freed from the predicament of two two intercommunicatings of complexity.And Px and Allocator can be arranged in the same entity.

Description of drawings

Fig. 1 is the allocation plan of IMS entity;

Fig. 2 is for comprising the network architecture diagram of IMS entity in the prior art;

Fig. 3 is a schematic diagram of realizing IPv4 UE intercommunication in the prior art by NAT;

Fig. 4 is the present invention program's realization flow figure;

Fig. 5 is positioned at the mutual schematic diagram of different access zone networks for calling and called among the present invention program;

Fig. 6 is first kind of structural representation of system of the present invention;

Fig. 7 is second kind of structural representation of system of the present invention;

Fig. 8 is the third structural representation of system of the present invention.

Embodiment

Switching network (MEN) in the middle of the present invention program at first is provided with, at user plane, this MEN and each network interconnection.Afterwards, set up in the flow process in session, obtain the address space identifier (ASID) of caller and called address space identifier (ASID), and be caller and called allocation map address and port, and with the address information of calling and/or called among suitable mapping address and the port modifications SDP according to the difference condition of the address space identifier (ASID) of the address space identifier (ASID) of calling and called, MEN.When transmitting Media Stream, address and the port translation with calling and/or called is mapping address and port as required, and the Media Stream after will handling then is forwarded to the opposite end network by MEN.

Below in conjunction with drawings and the specific embodiments the present invention program is done further detailed description.

As shown in Figure 4, the present invention program realizes by following steps:

Step 401, set up in the process, obtain caller and called address space identifier (ASID) in session, and the address space identifier (ASID) of MEN.

Step 402, according to the address space relation of caller, called and MEN, be calling and/or called UE allocation map address and port.

Address relationship between calling UE, called UE and the MEN has following four kinds of situations:

The address space of A1, calling UE is identical with the address space of called UE;

The address space of A2, calling UE is different from the address space of called UE, and the address space of calling UE and called UE all is not equal to the address space of MEN, and promptly three's address space has nothing in common with each other;

The address space of A3, calling UE is not equal to the address space of called UE, and the address space of called UE equals the address space of MEN;

The address space of A4, calling UE is not equal to the address space of called UE, and the address space of calling UE equals the address space of MEN.

At above-mentioned four kinds of situations, for the scheme of calling UE allocation map address and port as follows:

For situation A1,, therefore do not need to be again caller allocation map address and port because the address space of calling and called UE is identical.

For situation A2, be mapping address and the port of calling UE distribution with the MEN same address space, and the mapping address and the port of distribution and called UE same address space.If but the access zone network of called UE allows directly to enter present networks and to need not to change source address from the IP grouping of MEN, then need not to distribute for calling UE again and the mapping address and the port of called UE same address space.

For situation A3, need be mapping address and the port of calling UE distribution with the MEN same address space, this mapping address and port also belong to the address space of called UE.

For situation A4,,, then do not need to be calling UE allocation map address and port if called access zone network allows directly to enter present networks and need not to change source address from the IP grouping of MEN because the address space of calling UE is identical with the address space of MEN; Otherwise, need be mapping address and the port of calling UE distribution with the called UE same address space.

For the scheme of called UE allocation map address and port as follows:

For situation A1, then need not be called UE allocation map address and port.

For situation A2, be mapping address and the port of called UE distribution with the MEN same address space, and the mapping address and the port of distribution and calling UE same address space.Equally, if the access zone network of calling UE allows directly to enter present networks and need not to change source address from the IP grouping of MEN, then need not to be again mapping address and the port of called UE distribution with the calling UE same address space.

For situation A3,, then need not be called UE allocation map address and port if the caller access zone network allows directly to enter present networks and need not to change source address from the IP grouping of MEN; Otherwise, need be mapping address and the port of called UE distribution with the calling UE same address space.

For situation A4, need be mapping address and the port of called UE distribution with the MEN same address space.

For ease of describing, the raw address and the port of note calling UE are (IP1, Port1), this address and port are address and the port that access zone network is distributed to calling UE, this calling UE of dispensing of keeping the score and with the address and the port of MEN same address space be (IP1-1, Port1-1), distribute to this calling UE and with the address and the port of called UE same address space be (IP1-2, Port1-2), and note be used for revising the mapping address of sip message calling address information and port for (IP1-3, Port1-3); The raw address and the port of note called UE are (IP2, Port2), this address and port are address and the port that access zone network is distributed to called UE, this called UE of dispensing of keeping the score and with the address and the port of MEN same address space be (IP2-1, Port2-1), distribute to this called UE and with the address of calling UE same address space and port for (IP2-2, Port2-2), and note be used for revising the mapping address of sip message called address information and port for (IP2-3, Port2-3).When flow process was set up in each SIP session of processing, the above-mentioned several variablees except that raw address and port were both initialized to sky (null).

Step 403, set up in the flow process in the SIP session, according to distribution before, preserve address and the mapping address of port and calling UE and the binding record that port forms of calling UE, and preserve address and the mapping address of port and called UE and the binding record that port forms of called UE.

Certainly, if do not have allocation map address and port, then need not preserve the binding record.

Such as, for above-mentioned situation A1, all do not bind record at calling UE and called UE.

For above-mentioned situation A2, then can form two binding records at calling UE, promptly ((IP1, Port1), (IP1-1, Port1-1)) and ((IP1-1, Port1-1), (IP1-2, Port1-2)), at this moment (IP1-3, Port1-3) be (IP1-2, Port1-2).But, if called access zone network allows directly to enter present networks from the source address of the grouping of MEN, then only be required to be the address and the port of calling UE distribution and MEN same address space, thereby make that only need preserve one at calling UE binds record, i.e. ((IP1, Port1), (IP1-1, Port1-1)), (IP1-3 at this moment, Port1-3) be (IP1-1, Port1-1).At called UE can form equally two the binding records, promptly ((IP2, Port2), (IP2-1, Port2-1)) and ((IP2-1, Port2-1), (IP2-2, Port2-2)), at this moment (IP2-3, Port2-3) be (IP2-2, Port2-2).Equally, if the caller access zone network allows directly to enter present networks from the source address of the grouping of MEN, then only be required to be the address and the port of called UE distribution and MEN same address space, and have only binding record, i.e. ((an IP2 at called UE, Port2), (IP2-1, Port2-1)), (IP2-3 at this moment, Port2-3) be (IP2-1, Port2-1).

For above-mentioned situation A3, at calling UE, can form a binding record, promptly ((IP1, Port1), (IP1-1, Port1-1)).At called UE,, then do not bind record if the caller access zone network allows directly to enter present networks from the source address of the IP grouping of MEN; Otherwise, also can form a binding record at called UE, promptly ((IP2, Port2), (IP2-2, Port2-2)).

For above-mentioned situation A4,, then do not bind record at calling UE if called access zone network allows directly to enter present networks from the source address of the IP grouping of MEN; Otherwise, can form a binding record at calling UE, promptly ((IP1, Port1), (IP1-2, Port1-2)).At called UE, then can form a binding record, promptly ((IP2, Port2), (IP2-1, Port2-1)).

Step 404, session set up finish after, and the Media Stream of terminal is forwarded to before the opposite end, according to the binding record of preserving the source IP address in the IP head and port and/or purpose IP address and port are changed, and this Media Stream is forwarded to the opposite end by MEN.

Transmit Media Stream if desired, then the source IP address in the IP head and source port and/or purpose IP address and destination interface are changed according to binding record.Specifically, raw address and former port match during if the source address of the Media Stream IP that receives grouping and port and a binding are write down, then this source address and port are changed, and the source address after the conversion and port mapping address and the mapped port in the binding record for this reason then.Similarly, if the destination address of Media Stream IP grouping and destination interface and a raw address and a former port match of binding in the record, destination address after the conversion and destination interface then are mapping address and the mapped port in this binding record.

Such as, be example with above-mentioned situation A2.And because the conversion process of the Media Stream of calling UE and called UE is basic identical, therefore the Media Stream IP bag that specifically sends with calling UE is an example.

Suppose that source address that Operator#3 network among Fig. 5 and Operator#4 network all require to enter the IP grouping of present networks must belong to the address of present networks address space, after then flow processing is set up in session, calling address among the SDP and port are the address and the port of Operator#4 address space, called address and port then are the address and the port of Operator#3 address space, the address and the port that also are the called UE seen of calling UE belong to the Operator#3 address space, the address of the calling UE that called UE is seen and port then belong to the Operator#4 address space, so this Media Stream IP bag need be through twice conversion, IP bag source/destination address and port that calling UE is sent are respectively (IP1, Port1) and (IP2-2, Port2-2), conversion is for the first time carried out between Operator#3 and MEN, is (the IP1-1 identical with the MEN address space with the source address in this IP bag with port translation, Port1-1), and with destination address and port also be converted to identical with the MEN address space (IP2-1, Port2-1).After conversion for the first time, source address in the IP bag and destination address are the address with the MEN same address space.Conversion is for the second time carried out between Operator#4 and MEN, be address and the port that the source address in this IP bag and port and destination address and port is converted to the Operator#4 address space respectively, promptly be converted to respectively (IP1-2, Port1-2) and (IP2, Port2).

Suppose that the Operator#3 among Fig. 5 allows directly to enter present networks from the IP grouping of MEN, then calling address among the SDP and port are the address and the port of Operator#4 address space, called address and port then are the address and the port of MEN address space, therefore need do twice conversion for source address and port in the IP grouping bag, and only need be destination address and the once conversion of port do.Specifically, conversion is for the first time carried out between Operator#3 and MEN, is (the IP1-1 identical with the MEN address space with the source address in this IP bag with port translation, Port1-1), in current conversion, destination address and port are not changed, because this destination address is exactly address and the port identical with the MEN address space with port, be (IP2-1, Port2-1).After conversion for the first time, source address in the IP bag and port and destination address and port are the mapping address at MEN equally.Conversion is for the second time carried out between Operator#4 and MEN, address and port with the source address in this IP bag and port are converted to the Operator#4 address space again, promptly be converted to respectively (IP1-2, Port1-2) and (IP2, Port2).

Suppose that Operator#3 network and Operator#4 network among Fig. 5 all allow directly to enter present networks from source address and the port of MEN, then therefore address and the port that caller and called address and port are the MEN address space among the SDP all only need once be changed at calling UE and called UE.Conversion is for the first time carried out between Operator#3 and MEN, is that identical with the MEN address space (IP1-1, Port1-1), destination address and port are then constant with the source address in the IP bag and port translation.After conversion for the first time, source address in the IP bag and port and destination address and port are the mapping address at MEN equally.Conversion is for the second time carried out between Operator#4 and MEN, with address and the port that the destination address in this IP bag and port are converted to the Operator#4 address space again, is converted to promptly that (IP2, Port2), source address and port are then constant.

Conversion process at situation A3 and A4 is similar, therefore repeats no more.

In addition, if the IP version of IP version after the address transition and original address is different, then also need the IP head is carried out the conversion of IP version.

By above-mentioned processing, promptly finished the intercommunication between the UE of arbitrary address space.

Certainly, if above-mentioned conversation end, the mapping address and the port that distribute before then can discharging, and set binding record before the deletion.

State in realization when handling, specifically some logical functional entities can be set, such as, can in IMS, increase by three logic of class functional entitys, i.e. analyzer (Px), distributor (Allocator) and IP address and port translation device (IPAPT).Wherein, Px is mainly used in and obtains caller and called visit way address space identification, and request distributes and release mapping address and port; Allocator is mainly used in and is calling and called allocation map IP address and port, generates the binding record, and binding is noted be downloaded to IPAPT, and by the binding record among the order deletion IPAPT; IPAPT then is mainly used in according to the conversion of the binding record of self preserving to IP bag executive address and port.MEN then is used in the visit way address space of caller and called UE not simultaneously, and is interconnected by the access zone network of IPAPT and UE.

When specifically being provided with, can only Px be set in terminating S-CSCF module and called P-CSCF intermodule, made before INVITE is delivered to called UE, be calling and called UE and distributed mapping address and port; Also can Px be set respectively in terminating S-CSCF module and called P-CSCF intermodule and originating S-CSCF module and caller P-CSCF intermodule, made before INVITE is delivered to called UE, for calling UE has been distributed mapping address and port, and before the response message of called UE arrives calling UE, for called UE has been distributed mapping address and port; Can also Px be set in caller P-CSCF module and called P-CSCF intermodule; Can also further only Px be set in originating S-CSCF module and terminating S-CSCF intermodule, make both sides earlier alternately once, intactly to collect the address space identifier (ASID) of calling and called, when both sides continue to exchange the SDP offer/SDP answer of renewal in the flow process after the called INVITE of receiving then, revise address and port among the calling and called SDP.

Below these several set-up modes are described respectively.

Situation for Px only is set at terminating S-CSCF module and called P-CSCF intermodule at first needs to be provided with Px, make and set up in the flow process in session, from the INVITE of terminating S-CSCF module before arriving called P-CSCF module, earlier through Px.And Allocator and IPAPT be set in system, wherein, Allocator can be arranged on Anywhere, as long as can with Px and IPAPT alternately, and IPAPT should be located between the different network of address space, different as access zone network with the MEN address space as UE, IPAPT is set between them.Described setting as shown in Figure 6.

Can adopt following scheme to being provided with specifically of Px: be registered in the flow process of IMS at UE, because the P-CSCF module can be derived the address of the inquiry entrance of UE home network according to the home domain name of UE URL in the sip message, therefore the address of pre-configured entrance is the address of Px, thereby makes the P-CSCF module send to Px to Register request message.Px is transmitting when giving the S-CSCF module from the Register request message of P-CSCF module, the address of oneself is added in the address list of PATH head of Register request message again.Because the S-CSCF module can be stored the address list of PATH head, therefore, when UE when called, the S-CSCF module sends to sip message in the process of UE, sip message can be transmitted to the indicated node in address in the PATH head earlier.And the S-CSCF module can make up at the response message 200 OK message of Register request message and give the P-CSCF module, this message can be earlier through Px, when this message process Px, Px adds the address of oneself in the service-route head of 200 OK message to.Because UE can store the address list in the service-route head, and UE is afterwards when sending INVITE to the S-CSCF module, this message meeting is earlier through each indicated node in this address list, so this message can be prior to the S-CSCF module through Px in the session flow process.Thereby make Px set up between the S-CSCF module and P-CSCF module that appears in the flow process message pathway to the UE service in the SIP session.

After being provided with Px, Px need be from from obtaining calling address space identification and called address space identification the INVITE of terminating S-CSCF module.Wherein, obtain the calling address space identification three kinds of methods arranged:

1, elder generation takes out last address from the address list of service route (Record-Route) the title head of INVITE.Whether this address may be encrypted, and also may be unencrypted, can judge this address from the address expression-form and encrypt.If the address unencryption is such as being (＜sip:pcscfl.homel.net; Lr〉@homel.net), can think that then this address is the address of caller P-CSCF module; If address encryption is such as being＜sip:Token (＜sip:scscfl.homel.net; Lr 〉, sip:pcscfl.homel.net; Lr 〉) @homel.net; Tokenized-by=homel.net 〉, can think that then this address is the address after CSCF module node address information is encrypted.Can from the address of the caller P-CSCF module's address that obtained or encryption, derive the address space identifier (ASID) of caller afterwards.

Wherein, the method of deriving address space identifier (ASID) from unencrypted P-CSCF module's address can be: the corresponding relation and the record of pre-configured P-CSCF module's address and address space identifier (ASID), thus can obtain address space identifier (ASID) by the inquiry of P-CSCF module's address.

The method of deriving address space identifier (ASID) from encryption address can be: the corresponding relation of pre-configured network identity and address space identifier (ASID), and from encryption address, expressly obtain the network address in the network address fields of form, such as, encryption address＜sip:Token (＜sip:scscfl.homel.net; Lr 〉, sip:pcscfl.homel.net; Lr 〉) @homel.net; Tokenized-by=homel.net〉in homel.net be exactly network identity, derive address space identifier (ASID) according to this network identity and pre-configured corresponding relation then.

2, the penult address in the address list of approach (Via) the title head of taking-up INVITE, this address may be encrypted, and also may be unencrypted, can judge whether this address encrypts from its expression-form.If the address unencryption thinks that then this address is a caller P-CSCF module's address; If address encryption is such as being that form is the ciphertext of token (x), as Token (SIP/2.0/UDPscscfl.homel.net; Branch=z9hG4bK332b23.1, SIP/2.0/UDPpcscfl.homel.net; Branch=z9hG4bK431h23.1) @homel.net; Tokenized-by=homel.net can think that then this address is the address after CSCF module node address information is encrypted.Can from the address of the caller P-CSCF module's address that obtained or encryption, derive the address space identifier (ASID) of caller afterwards, identical in its acquisition methods and the said method 1, therefore repeat no more.

3, place a logic function in the S-CSCF of UE module and P-CSCF intermodule, be referred to as Color, this logic function can be realized by P-CSCF module, S-CSCF module or I-CSCF module, also can be realized by other node at P-CSCF module and S-CSCF intermodule.Then when the INVITE from caller P-CSCF module passed through Color, Color appended to the address space identifier (ASID) of caller in the SIP head or SDP descriptor of INVITE.After this INVITE sent to Px from the terminating S-CSCF module, Px can obtain the calling address space identification that Color adds by resolving this message.Certainly, Color appends to the access zone network sign in the INVITE, rather than the directly address space identifier (ASID) of additional caller, like this, Px need utilize the mapping table of network identity and address space identifier (ASID) to determine the address space identifier (ASID) of caller after obtaining the access zone network sign that Color adds again.

Wherein, Color specifically can be to increase a new SIP head with the SIP head that the address space identifier (ASID) of caller appends to INVITE, or increases new parameter in certain defined head, such as increasing realm:IPv6.

Color appends to the address space identifier (ASID) of caller in the SDP descriptor of INVITE, specifically can be that a who comprises address space identifier (ASID) of increase is capable in the SDP descriptor, such as:

v＝0

o＝Bob?2890844525?2890841527?IN?IP4?131.160.1.20

c＝IN?IP4?131.160.1.20

t＝0?0

a＝realm:public?IPv4

m＝audio?49171?RTP/AVP?0

As seen, the capable attribute of a that increases newly " realm " by name represents that this attribute represents address space identifier (ASID), and its attribute is called " pubic IPv4 ", represents that this address space identification is " Public IPv4 ".

Px obtains the called address space identification two methods, specific as follows:

1, take out last address in the address list of Route title head from INVITE, this address is taken as the address of called P-CSCF module, derives called address space identifier (ASID) then from this P-CSCF module's address.This method of deriving the called address space identification specifically can be to realize by the corresponding relation of pre-configured P-CSCF module's address and address space identifier (ASID).

If 2 one Px have a plurality of addresses, the access zone network at the corresponding UE place, an address of Px then is set, it is P-CSCF module location network, each Px perhaps is set corresponding to an access zone network, afterwards, when UE is positioned at the x of operator, and this UE is when carrying out the SIP registration, and Px uses with the x of operator corresponding address Px_Add_x and revises PATH head and Service-Route head in the sip message.Like this, if the corresponding relation of pre-configured Px_Add_x and operator's address space identifier (ASID), then set up in the flow process in follow-up session, when Px receives sip message from UE S-CSCF module on the Px_Add_x of address, perhaps find to have comprised address Px_Add_x in the Route head of the sip message receive, then Px can inquire about from pre-configured corresponding relation and obtain and this address Px_Add_x corresponding address space identification, promptly obtains the address space identifier (ASID) of the access zone network of UE.

Px judges whether the address space of these two address space identifier (ASID) representatives is identical after having obtained caller and called address space identifier (ASID), if identical, then determine therefore can directly transmit corresponding message without allocation map address and port; Otherwise according to the relation of the address space identifier (ASID) of caller, called and MEN, request Allocator is caller and called allocation map address.Send to and comprise following element in the request primitive of Allocator: the address space identifier (ASID) of session identification, calling address and port, calling address space identification, called address space identification and MEN.Wherein, for making Px can obtain the address space identifier (ASID) of MEN, can the address space identifier (ASID) of configuration MEN in Px earlier.

Allocator is after receiving the request primitive that Px sends, for calling UE and/or called UE are distributed corresponding mapping address and port, and the original address of calling and called and port, the mapping address that is distributed and port, session identification and IPAPT sign associated, be about to raw address and former port, mapping address and mapped port, session identification and IPAPT sign and constitute compound binding record.And (raw address and former port, mapping address and mapped port) in the compound binding record will be downloaded on the IPAPT of IPAPT sign appointment.

Suppose that session identification is SID, note caller access zone network, promptly the VN-CR of Fig. 6 and the IPAPT between the MEN are IPAPT1, remember called access zone network, promptly the VN-CE of Fig. 6 and the IPAPT between the MEN are IPAPT2.

Then for above-mentioned situation A2, if the calling and called access zone network does not all allow directly to enter present networks from the source address of the grouping of MEN, then Allocator is that two compound binding records are created in caller, promptly (((IP1, Port1), (IP1-1, Port1-1)), SID, IPAPT1) and (((IP1-1, Port1-1), (IP1-2, Port1-2)), SID, IPAPT2); And be two compound binding records of called establishment, promptly (((*, *), (IP2-1, Port2-1)), SID, IPAPT2) and (((IP2-1, Port2-1), (IP2-2, Port2-2)), SID, IPAPT1), wherein, * represents occurrence the unknown of called raw address and port because this moment Px also do not receive contain called address from called SDP answer, afterwards, if Px receives the message that contains called address, then * can be changed into called raw address and port.Certainly, before called address is not determined, can not download to IPAPT.

And if called access zone network allows directly to enter present networks from the source address of the grouping of MEN, then Allocator only need create a compound binding record for caller, promptly (((IP1, Port1), (IP1-1, Port1-1)), SID, IPAPT1); But be called two the compound binding records of still need creating, as hereinbefore, therefore repeat no more.

Similarly, if the caller access zone network allows directly to enter present networks from the source address of the grouping of MEN, then Allocator only need be compound binding record of called establishment, promptly (((*, *), (IP2-1, Port2-1)), SID, IPAPT2); But still need create two compound binding records for caller, as hereinbefore, therefore repeat no more.

For above-mentioned situation A3, Allocator need create a compound binding record for caller, promptly (((IP1, Port1), (IP1-1, Port1-1)), SID, IPAPT1).At called UE,, then do not bind record if the caller access zone network allows directly to enter present networks from the source address of the IP grouping of MEN; Otherwise, also can create a binding record at called UE, promptly (((*, *), (IP2-2, Port2-2)), SID, IPAPT2).

For above-mentioned situation A4, Allocator need be compound binding record of called establishment, promptly (((*, *), (IP2-1, Port2-1)), SID, IPAPT2).At calling UE,, then do not bind record if called access zone network allows directly to enter present networks from the source address of the IP grouping of MEN; Otherwise, also can create a binding record at calling UE, promptly (((IP1, Port1), (IP1-2, Port1-2)), SID, IPAPT1).

Allocator is after creating the binding record, and that will distribute for caller and identical with the called address space mapping address and port return to Px.

The address and the port of caller in the binding record modification INVITE that Px then returns according to Allocator, and oneself address is increased in the Record-Route title head, send to called P-CSCF module then.Px can also write down this session and set up and be the mapping address of called distribution and mapped port in the flow process.

Called P-CSCF module is transmitted to called UE with INVITE.And based on setting before, called P-CSCF module is transmitted to Px with this sip message behind the sip message that the reception called UE is sent.Wherein, this sip message can be the message of 183 Session Progress, 200 OK and so on.

Afterwards, when from called P-CSCF module and the sip message that comprises called address information during through Px, Px is notified to Allocator with called address in this message and port, if be not recorded as the mapping address and the port of called distribution before the Px, then can ask Allocator to be returned as the mapping address and the port of called distribution at this.Comprise session identification and called address and port in the request primitive.

Use the session identification in the request primitive to find among the Allocator, use address called in the request primitive and port to fill in the unknown-value of binding in the record, and return response message to Px about called compound binding record.If Px has also sent the mapping address that obtains called UE and the indication of port, then Allocator also need will this called mapping address and port return to Px, promptly comprise session identification and mapping address and port in the response primitive that Allocator returns.

Px is updated to mapping address and port with address called in the sip message and port information after receiving response message.

Afterwards, when session will soon be set up successfully, receive UPDATE sip message such as Px from the terminating S-CSCF module after, Px request Allocator notes binding and is downloaded among the suitable IPAPT.Comprise session identification in the request primitive.

Allocator will note according to the binding that calling and called raw address and port and mapping address and port form and be downloaded among the represented IPAPT of IPAPT sign in the compound binding record then after the request of receiving Px.

After above-mentioned processing, when Media Stream IP grouping process IPAPT, IPAPT will retrieve these binding records according to source address and port, destination address and the port of IP grouping respectively, and address transition is carried out in grouping to IP then.

In addition, after session is released, receive the BYE sip message such as Px after, the corresponding binding of Px request Allocator deletion record.Px sends in the request primitive of Allocator and comprises session identification.Allocator orders the corresponding binding of corresponding IPAPT deletion record after receiving removal request, and to discharge be the mapping address of caller and called distribution originally, and corresponding compound binding record.

Such scheme is only in terminating S-CSCF module and called P-CSCF intermodule Px to be set, and also can Px be set respectively in originating S-CSCF module and caller P-CSCF intermodule and terminating S-CSCF module and called P-CSCF intermodule.For second kind of plan of establishment, be with the main difference point of preceding a kind of setting: second kind of setting is respectively caller and called allocation map address and port by two Px.The setting of Allocator and IPAPT is then constant.The system configuration of this second kind of scheme as shown in Figure 7.Below the concrete main difference point of handling of this second kind of scheme is described.

At first, need be between originating S-CSCF module and caller P-CSCF module, and between terminating S-CSCF module and the called P-CSCF module Px is set respectively, the concrete plan of establishment is identical with preceding a kind of scheme, so repeats no more.To be called Px#1 at the Px of originating S-CSCF module and the setting of caller P-CSCF intermodule in the present embodiment, be called Px#2 at the Px of terminating S-CSCF module and the setting of called P-CSCF intermodule.

Afterwards, when from the INVITE of caller during through the Px#2 between terminating S-CSCF module and the called P-CSCF module, Px#2 at first obtains the access zone network address space of calling and called and the address space of MEN, after the relation of determining the three, request Allocator is caller allocation map address and port, and revise calling address and port among the SDP offer as required, but be not called application mapping address and port.Wherein, the processing of Px#2 derivation caller and called address space identification is identical with the processing in above-mentioned first kind of scheme, therefore repeats no more.

When such as 183 session progress from called sip message through the conversation message path in during Px#1 between caller P-CSCF module and originating S-CSCF module, Px#1 obtains the access zone network address space of calling and called and the address space of MEN, and after the relation of determining the three, request Allocator is called allocation map address and port, and revises called address and port among the SDP answer as required.

Wherein, the processing of Px#1 derivation calling address space identification has three kinds, and is specific as follows:

1, takes out penult address in the Via of called sip message title head, such as being pcscfl.homel.net, with the address of this address, derive the visit way address space identification of caller then according to the address of this caller P-CSCF module as caller P-CSCF module.Concrete derivation can be to realize by the pre-configured P-CSCF module and the corresponding relation of visit way address space identification.

If 2 one Px have a plurality of addresses, the access zone network at the corresponding UE place, an address of Px then is set, or each Px is set corresponding to an access zone network, afterwards, when UE is positioned at the x of operator, and when this UE carried out the SIP registration, Px use and the x of operator corresponding address Px-Add-x revised PATH head and the Service-Route head in the sip message.Like this, if the corresponding relation of pre-configured Px_Add_x and operator's address space identifier (ASID), then set up in the flow process in follow-up session, when Px receives sip message from UE S-CSCF module on the Px_Add_x of address, perhaps find to have comprised address Px_Add_x in the Route head of the sip message receive, then Px can inquire about from pre-configured corresponding relation and obtain and this address Px_Add_x corresponding address space identification, thereby obtains the address space identifier (ASID) of the access zone network of UE.

3, when the INVITE from caller passes through Px#1, from message, obtain the P-CSCF module's address, be caller P-CSCF module's address is used as in the penult address of the Via head in the INVITE or last address of record route (Record-Route) head, and derive caller visit way address space according to this caller P-CSCF module's address.Concrete derivation can be to realize by the pre-configured P-CSCF module and the corresponding relation of visit way address space identification.

A method of Px#1 derivation called address space identification is: will be used as the address of called P-CSCF module from first address among the Record-Route of called sip message, this address may be expressly, also may be by the address after the I-CSCF module encrypt.The method of deriving called visit way address space from this called P-CSCF module's address as hereinbefore, if promptly the address is expressly, then can inquire the address space identifier (ASID) on called visit ground by the corresponding relation of pre-configured P-CSCF module's address and address space identifier (ASID); If the address is encrypted, then can be from encryption address expressly obtain network identity in the network identity field of form, the network identity and the corresponding relation of address space identifier (ASID) by setting in advance then inquires the address space identifier (ASID) on called visit ground.

Afterwards, when session will soon be created successfully, receive UPDATE sip message from the terminating S-CSCF module as Px#2, then Px#2 request Allocator will note about the binding of caller and be downloaded among the corresponding IPAPT; If Px#1 receives the UPDATE sip message from caller P-CSCF module, then Px#1 request Allocator will note about called binding and be downloaded among the suitable IPAPT.

Correspondingly, behind conversation end, Px#2 and Px#1 can ask Allocator deletion caller and called in compound binding record, Allocator then can delete the binding record among the corresponding IPAPT.

The present invention program can also only be provided with Px in originating S-CSCF module and terminating S-CSCF intermodule.The concrete setting as shown in Figure 8.The difference that also is primarily aimed at this scheme and above-mentioned two kinds of schemes below is described.

For this set scheme, if Px is arranged on the newly-increased node, then inserting Px between two S-CSCF modules can be: be the address configuration of Px the pairing address of home domain of user's public user identity in DNS, like this, when the S-CSCF module of caller continues to transmit INVITE, the originating S-CSCF module is taken out the information of home location field of public user identity called among the request URI, by the pairing address of this field of dns lookup, and INVITE sent to this address, so, INVITE must pass through Px, Px then during through self, is increased to oneself address the stem of the Record-Route head of message at INVITE.

Can also be at insertion Px between two S-CSCF modules by Px being integrated on the I-CSCF module between originating S-CSCF module and the terminating S-CSCF module or directly being integrated in the originating S-CSCF module or the realization of terminating S-CSCF module.

Calling UE and called UE is carried out once or mutual once after, the address space identifier (ASID) that Px obtains calling and called according to the message of receiving.Such as, when passing through Px from called response message such as 183 session progress, Px obtains the address space identifier (ASID) of calling and called, Px compares the address space identifier (ASID) of calling and called and the address space identifier (ASID) of MEN then, and asking Allocator as required is calling and called allocation map address and port.And Px is mapping address and port with called address among the SDP answer of this response message and port modifications.Follow-up in caller such as PRACK, when UPDATE message is passed through Px, be mapping address and port with calling address among the SDP offer in the message and port modifications.

Wherein, the address space identifier (ASID) that Px obtains calling and called has two kinds of methods: a kind of is to set up the Color function respectively between calling/called P-CSCF module and S-CSCF module, the address space identifier (ASID) of Calling Side Color function additional caller in INVITE, when message process Px, the corresponding relation of Px recording conversation sign and calling address space identification.Callee side Color function can be in the additional called address space identifier (ASID) of the called message of sending (as 183 session progress), and when message process Px, Px obtains the called address space identification.

Another kind is last address of taking out in the Record-Router head, obtains the address space identifier (ASID) of caller by this address; And take out the most preceding address in the Record-Router head, obtain called address space identifier (ASID) by this address.Method according to address address acquisition space identification the most preceding in the Record-Router head in concrete acquisition methods and the aforementioned two kinds of schemes is identical, so repeats no more here.

At last, before the session flow process was set up successfully, if Px receives UPDATE message or 200 OK message, then Px request Allocator downloaded to bind accordingly and records among the IPAPT.

The present invention program can also be provided with Px in caller P-CSCF module and called P-CSCF intermodule, it is identical with several plans of establishment before that the method for Px specifically is set, and can realize being provided with Px on any one equipment between caller P-CSCF module and the called P-CSCF module by Px is set directly at.Px obtains the address space identifier (ASID) of calling and called UE then can adopt above-mentioned the third processing scheme, promptly is provided with in the Px scheme in originating S-CSCF module and terminating S-CSCF intermodule, and Px obtains the method for the address space identifier (ASID) of calling and called UE.

The above only is the present invention program's preferred embodiment, not in order to limit protection scope of the present invention.

Claims

1, a kind of method that realizes random address space UE communication is characterized in that, the middle switching network MEN of setting and each network interconnection, and this method may further comprise the steps:

2, method according to claim 1 is characterized in that among the described step b, the relation of described address space according to caller, called and MEN, for calling and/or called UE allocation map address and port are:

3, method according to claim 1 is characterized in that among the described step b, the relation of described address space according to caller, called and MEN, for calling and/or called UE allocation map address and port are:

4, method according to claim 1 is characterized in that, this method further comprises: behind conversation end, and mapping address that distributes among the release steps b and port, and delete the binding record of being preserved.

5, method according to claim 1 is characterized in that, sets in advance analyzer Px, distributor Allocator and IP address and port translation device IPAPT,

Described step a is realized by Px;

6, method according to claim 5 is characterized in that, described Px is set in the session path between the called service call conversation control function S-CSCF module and called Proxy Call Session Control Function P-CSCF module.

7, method according to claim 5 is characterized in that, described Px is separately positioned in the session path between the terminating S-CSCF module and called P-CSCF module and originating S-CSCF module and caller P-CSCF module.

8, method according to claim 5 is characterized in that, described Px is set in the session path between the caller P-CSCF module and called P-CSCF module, perhaps is arranged between originating S-CSCF module and the terminating S-CSCF module.

9, according to claim 6,7 or 8 described methods, it is characterized in that, the described Px of setting is: will inquire that entry point address is configured to the address of this Px, in the UE register flow path, the P-CSCF module sends to this Px according to described configuration with the request message of receiving, Px increases the address of oneself in the path P ATH of this message head, give the S-CSCF module with this forwards afterwards; As the response message process Px from the S-CSCF module, Px adds the address of oneself in the service route Service-Route head of response message to.

10, according to claim 6 or 7 described methods, it is characterized in that among the described step a,

11, method according to claim 7, it is characterized in that, describedly be arranged on the address space identifier (ASID) that Calling Side Px obtains calling UE and be: obtain from the penult address in the Via title head of called sip message, with the address of this address, and determine the pairing address space identifier (ASID) of this caller P-CSCF module's address according to the corresponding relation of pre-configured P-CSCF module and address space identifier (ASID) as caller P-CSCF module;

12, method according to claim 8, it is characterized in that, the described Px of setting is: be that belonging area network identifies pairing address in the public user identity of UE with the address configuration of Px, the originating S-CSCF module is when follow-up forwarding INVITE, utilize the belonging area network identification information of called public user identity to search the pairing address of this information, afterwards this INVITE is sent to this address, Px is when transmitting message afterwards, oneself address is increased to the top of the Record-Route head of message.

13, method according to claim 8, it is characterized in that among the described step a, the address space identifier (ASID) that described Px obtains calling and called UE is: between caller and called P-CSCF module and S-CSCF module a logic function is set, and this logic function increases the address space identifier (ASID) of UE access zone network in sip message, and Px is with the address space identifier (ASID) of carrying in this message address space identifier (ASID) as this UE access zone network;

14, method according to claim 1, it is characterized in that among the described step b, after distributing corresponding mapping address and port according to the request of receiving, further comprise: preserve calling UE and/or the raw address of called UE and the corresponding relation of port and mapping address and port.

15, method according to claim 1 is characterized in that, this method further comprises: after definite session is released, and mapping address that release steps b distributed and port, and delete the corresponding relation of being preserved.

16, a kind of system that realizes random address space UE communication, this system comprises the access zone network of calling UE and the access zone network of called UE, it is characterized in that, this system further comprises: analyzer Px, distributor Allocator, IP address and port translation device IPAPT and with the middle switching network MEN of each network interconnection, wherein

17, system according to claim 16 is characterized in that, described Px is arranged in the session path between the called service call session control S-CSCF module and called agent call session control P-CSCF module; Described Px or be arranged at respectively in the session path between the terminating S-CSCF module and called P-CSCF module and originating S-CSCF module and caller P-CSCF module.

18, system according to claim 16 is characterized in that, described Px is arranged in the session path between the caller P-CSCF module and called P-CSCF module, perhaps is arranged between originating S-CSCF module and the terminating S-CSCF module.

19, according to claim 17 or 18 described systems, it is characterized in that,

20, system according to claim 18 is characterized in that, the address of Px is that belonging area network identifies pairing address in the public user identity of UE in the described system;

The originating S-CSCF mould certainly is further used for: when transmitting INVITE, utilize the belonging area network identification information of called public user identity to search the pairing Px of this information address, afterwards this INVITE is sent to this address;

21, system according to claim 16 is characterized in that, described Px is further used for behind conversation end, request Allocator deletion mapping address and port information;

22, system according to claim 16, it is characterized in that, described Px is arranged between the S-CSCF module and P-CSCF module in the called access zone network, and be positioned on the terminating S-CSCF module, or be positioned on the called P-CSCF module, or on the I-CSCF module between S-CSCF module and the P-CSCF module, or on the newly-increased node between S-CSCF module and the P-CSCF module;