CN101106813B

CN101106813B - Method for recognizing abuse of emergent carrier resource and carrier control IP gateway in network

Info

Publication number: CN101106813B
Application number: CN2006101153885A
Authority: CN
Inventors: 赵鹏; 朱奋勤
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-07-14
Filing date: 2006-08-15
Publication date: 2010-04-21
Anticipated expiration: 2026-08-15
Also published as: CN101106813A

Abstract

The invention discloses a method for identifying abuse of urgent load resource in IMS, which has a key point of that, aimed at the urgent load resource, a filter rule including IP communication method is arranged at the access side load control IP gateway, and the IP communication method used for an urgent service and contained in a functional entity which can communicate with the UE directly via IP during an urgent service. During a calling procedure, after an IP package transferred via an urgent load resource, the access side load control IP gateway judges whether the IP communication method in the IP package belongs to ones allowed by the filter rule, if not, the calling is determined to abuse urgent load resource. With the invention, calling abusing urgent load resource can be identified rapidly and effectively, thereby ensuring that the urgent load resource is only used for urgent service and preventing the urgent load resource from being abused. The invention can be applied simply and effectively. The invention also discloses an access side load control IP gateway.

Description

The method of identification abuse of emergency bearing resource and access side carrying control IP gateway

Technical field

The present invention relates to communication technical field, be meant the method for identification abuse of emergency bearing resource in a kind of IP Multimedia System (IMS) especially and insert side carrying control IP gateway.

Background technology

Under urgent state, the user can use subscriber equipment (UE) to call out public safety answering point (PSAP, Public Safety Answering Point) obtains help, PSAP mentioned in this article comprises public splicing point, also comprise emergency such as police office, fire-fighting group, hospital, and PSAP also might initiate callback to the user after user's on-hook, so that understand more information.Urgency traffic mentioned in this article is meant that the user initiates urgent call, can also comprise PSAP callback user's situation, certainly, also can not comprise the situation of PSAP callback.

Figure 1 shows that the signaling process frame diagram of existing IMS territory urgent call.Solid line is represented the urgent call that UE initiates among the figure, and dotted line is represented the callback that PSAP initiates.The urgent call that UE 10 initiates is by GGSN (GGSN, Gateway GPRS Support Node) 20 Proxy Call Session Control Function (P-CSCF,, Proxy Call Session Control Function) entity 40, emergency call session controlled function (E-CSCF) entity 50 arrive PSAP 80, and the callback that PSAP 80 initiates arrives UE 10 by service call conversation control function (S-CSCF) entity 60, P-CSCF 40, GGSN 20.If PSAP is positioned at public switch telephone network (PSTN) or circuit domain (CS) network, then E-CSCF mails to signaling that PSAP and PSAP mail to S-CSCF and need pass through MGCF (MGCF) entity and change, if PSAP in the IP territory, then need not pass through MGCF.Strategy decision function (PDF) entity is used for the management of bearing resource among Fig. 1.When there is network address translation (nat) equipment 90 in the centre, certain entity in the signaling paths, as P-CSCF, can be according to the practical application needs to NAT device application medium face resource when the session.

Because urgent call is the service of a locality, so the user is when roaming, GGSN, PDF, P-CSCF, E-CSCF, MGCF1 and PSAP are the roaming places, may but when the PSAP callback, then have two kinds, a kind of MGCF1 that is to use the roaming place is that MGCF70a inserts the IMS territory, and a kind of is that MGCF2 by the user attaching territory is that MGCF70b inserts the IMS territory.

Management process below in conjunction with the IMS bearing resource describes existing urgent call flow process.

Figure 2 shows that the management process schematic diagram of existing IMS bearing resource.

Step 101～102, after the user determines to initiate a calling, at first initiate a bearing resource application that inserts side by UE, generally be to send an establishment group data protocol (Create PDP) request to GGSN, if be the resource of urgency traffic application, then will carry the indication of emergency bearing in this request, as emergency bearing sign or urgent APN etc.After GGSN and Access Network distributed bearing resource to UE, GGSN returned the response of application bearing resource success, as Create PDP response.

Step 103～104, the bearing resource that the UE request for utilization is arrived sends request (INVITE) message of SIP, and the destination address of its IP bag is P-CSCF.This message is carried out transfer by GGSN, if what carry out is urgent call, contains the urgency traffic indication so in this INVITE.

Step 105～106, P-CSCF is transmitted to other equipment with this request, as E-CSCF etc., carries out the foundation of urgent call, afterwards, receives 200 message of INVITE.

Step 107～108, P-CSCF is with the user connection information that obtains in INVITE and 200 such as IP address port etc., with Qos information such as bandwidth etc., send to PDF, normally used is the AAR (AA-Request) of Diamter agreement, afterwards, receive the response message from PDF, normally used is AAA (AA-Answer) message of Diamter.If first response message of this session must carry a Token so in this message, this Token has identified this PDF and this session.

Step 109～110, P-CSCF gives UE with 200 message of receiving in the step 106 by the GGSN forward pass, if do not carry Token in the past, needs so Token is added in the message.

Step 111, after UE receives the message that P-CSCF sends, according to link information that obtains and Qos information is that media information is initiated the resource bid process, this is the process creating or upgrade PDP, carry Token in the message, if the emergency bearing request will contain certain indication in this message, can know that according to this indication GGSN this is the carrying request of a urgency traffic.Above-mentioned certain indication can be the incidence relation with the emergency bearing resource of having applied for, also can be emergency bearing sign etc.

Step 112, GGSN according to Token, initiates the authentication request of bearing resource, the normally REQ of COPS (COPS REQuest message) message to PDF after receiving this solicitation message.

Step 113, PDF is with relevant user connection information, and Qos information and some other information send to GGSN, use DEC (the COPS DECision message) message of COPS usually.

Step 114, GGSN checks the resource of bearing bed application according to the DEC message of receiving, for example whether IP address port and bandwidth information meet the requirement of application layer, if legally will distribute bearing resource to UE at Access Network, send bearing resource request responding message to UE simultaneously.

Step 115, if carrying applies for that successfully UE will send data and converse, the IP bag of these data can be sent to GGSN, its destination address is the media device of being correlated with.

Step 116, GGSN is forwarded to the destination media device that IP wraps with packet, and wherein media device comprises the media device that PSAP controls, media device that MGCF controlled and NAT device etc.

In step 101 and step 111, the resource of expression UE application is being designated as of emergency bearing: a urgent identification field, the urgent APN (APN) that the overall situation is proprietary, the perhaps index that can be associated with existing emergency bearing.

Based on above-mentioned management process, the method that existing urgency traffic adopts is: at first on GGSN at the configurating filtered rule of urgent APN, only allow the IP bag of address of the P-CSCF that is used for urgent call that carried appointment pass through GGSN, guarantee that the IP bag that UE sends can only arrive the P-CSCF that is used for urgent call, also can only receive the IP bag of coming these addresses simultaneously.If be urgency traffic application bearing resource, when application, just step 101 among Fig. 2 and step 111 will be carried the emergency bearing indication so.So GGSN receive from or when mailing to the bearing resource of applying for these addresses, will use filtering rule to filter all IP bags, this processing occurs in step 104, step 110 and step 116.

And emergency bearing resource is enjoyed priority and the Qos higher than common bearing resource usually, even in ordinary call because roaming restriction does not allow to use the situation of bearing resource, emergency bearing resource is operable, and using the urgent call of emergency bearing resource simultaneously might be free at bearing bed also.But the function of GGSN is just transmitted the IP bag that UE sends, do not resolve its application layer content, above-mentioned filtering rule can limit the IP bag that UE sends can only arrive some specific P-CSCF that are used for urgency traffic, whether but not limiting P-CSCF still carries out urgency traffic after to the Context resolution that receives and handles, the user just might apply for urgent bearing resource when inserting GGSN like this, and use common calling in upper layer application, so just side escape charging can inserted, roaming restriction etc., thus abuse of emergency bearing resource caused.

Summary of the invention

In view of this, the object of the present invention is to provide method and a kind of access side carrying control IP gateway of identification abuse of emergency bearing resource among a kind of IMS, to prevent that emergency bearing resource from being abused.

For achieving the above object, technical scheme of the present invention comprises:

The method of identification abuse of emergency bearing resource among a kind of IP Multimedia System IMS, setting comprises the filtering rule of IP contact method at emergency bearing resource inserting side carrying control IP gateway, this IP contact method used sign when communicating by IP, only be used for being identified at urgency traffic, the urgency traffic of the functional entity that directly is connected by IP with UE, this method also comprises:

In calling procedure, insert side carrying control IP gateway receive use the IP bag that emergency bearing resource transmits after, judge whether the IP contact method in this IP bag belongs to the current IP contact method of permission in the described filtering rule, if not, then judge this calling abuse of emergency bearing resource.

Wherein, describedly directly comprise: the pairing entity in signaling purpose IP address that UE sends, and the pairing media device in medium purpose IP address that sends of UE by the functional entity that IP is connected with UE.

Wherein, described media device comprises media device that media device, MGCF controlled and the network address translation device that PSAP controls.

Wherein, if described media device is not to be exclusively used in urgency traffic, then for only be used for the medium face IP contact method of urgency traffic in the urgency traffic with direct communication side's reservation of UE.

Wherein, the message that goes out to receive when certain Entity recognition that is arranged in signaling paths is used for urgency traffic, directly or indirectly when media device application media resource, carry and show it is indication for media resource that urgency traffic is applied for, described media device of accepting applications distributes the medium face IP contact method of being reserved for the direct communication side of this UE.

Wherein, described when communicating by IP used sign be one of sign of the communication protocol sign session on SPI, gre tunneling sign or the IP layer of IP address, port, IPSEC, also can be above all combination in any.

Wherein, described calling procedure is initiated by UE or is initiated by PSAP.

Wherein, when described calling is initiated by PSAP, and this PSAP is when being positioned at non-IP territory, and described PSAP inserts the IMS territory by the on-site MGCF of PSAP.

Wherein, when described PSAP was positioned at non-IP territory, described PSAP by the process that the on-site MGCF of PSAP inserts the IMS territory was:

For PSAP distributes an independent number that is used for urgent call;

Network based is the number that is used for urgent call as caller that PSAP distributed, and routes the call to the MGCF of user ascription area, inserts the IMS territory.

A kind of access side carrying control IP gateway comprises:

The filtering rule memory module, be used to preserve the filtering rule that comprises the IP contact method at the emergency bearing resource setting, this IP contact method used sign when communicating by IP only is used for being identified at urgency traffic, the urgency traffic of the functional entity that directly is connected by IP with UE;

The resource identification module, be used at calling procedure, receive use the IP bag that emergency bearing resource transmits after, judge whether IP contact method in this IP bag belongs to allow current IP contact method in the described filtering rule, if not, then judge this calling abuse of emergency bearing resource.

Wherein, describedly directly comprise: the pairing entity in signaling purpose IP address that UE sends, and the pairing media device in medium purpose IP address that sends of UE by the functional entity that IP is connected with UE; Described media device comprises media device that media device, MGCF controlled and the network address translation device that PSAP controls.

Wherein, described access side carrying control IP gateway comprises GGSN GGSN, packet data serving node PDSN.

Key of the present invention is, at emergency bearing filtering rule is set in access side carrying control IP gateway, comprise in the urgency traffic IP contact method that is used for urgency traffic in the functional entity that directly is connected by IP with UE in this filtering rule, in calling procedure, insert side carrying control IP gateway receive use the IP bag that emergency bearing resource transmits after, judge whether the IP contact method in this IP bag belongs to the current IP contact method of permission in the described filtering rule, if not, then judge this calling abuse of emergency bearing resource.The present invention's effective recognition rapidly goes out the calling of abuse of emergency bearing resource, thereby has guaranteed that emergency bearing resource can only be applied to urgency traffic, has avoided emergency bearing resource to be abused.The present invention uses simply, effectively.

Description of drawings

Fig. 1 is the flow process frame diagram of the signaling urgent call in existing IMS territory;

Fig. 2 is the management process schematic diagram of existing MS bearing resource;

Fig. 3 is the bearing resource management process schematic diagram according to first embodiment of the invention;

Fig. 4 is the bearing resource management process schematic diagram according to second embodiment of the invention.

Embodiment

The present invention is described in further detail below in conjunction with accompanying drawing.

Main thought of the present invention is: prevent that emergency bearing resource from being abused, for this reason, method provided by the invention is, at emergency bearing resource filtering rule is set in access side carrying control IP gateway, it is current that this filtering rule has only allowed to comprise in the urgency traffic IP bag of the IP contact method that is used for urgency traffic in the functional entity that directly is connected by IP with UE, in calling procedure, insert side carrying control IP gateway receive use the IP bag that emergency bearing resource transmits after, judge whether the IP contact method in this IP bag belongs to the current IP contact method of permission in the described filtering rule, if, then continue normal process, otherwise be judged to be abuse of emergency bearing resource.

Above-mentionedly directly comprise: pairing entity in signaling purpose IP address that UE sends such as P-CSCF etc., and the pairing media device in medium purpose IP address that sends of UE by the functional entity that IP is connected with UE.

The above-mentioned IP contact method that is used for being used in the functional entity that urgency traffic and UE directly be connected by IP urgency traffic comprises the IP contact method of the P-CSCF that urgency traffic is relevant, and the medium face IP contact method of urgency traffic service entities and the medium face IP contact method that NAT device is used for urgency traffic are provided.Above-mentioned IP contact method used sign when communicating by IP, this sign can be the IP address, port, the Security Parameter Index (SPI) of IPsec (Intemet protocol security), one of sign of communication protocol sign session on generic route encapsulation (GRE) Tunnel Identifier or the IP layer also can be the combination in any of above all elements.Media device is meant the pairing entity of IP destination address of the packet that the user sends, and comprises the media device that PSAP controls, the media device that MGCF controlled, NAT device etc.Media device that above-mentioned PSAP controlled and PSAP itself can be identical or different physical equipment; Media device that MGCF controlled and MGCF itself also can be identical or different physical equipment.

Fig. 3 and Fig. 4 are based on two specific embodiments of the present invention.

Referring to Fig. 3, present embodiment is initiated urgent call by UE, and inserting side carrying control IP gateway is GGSN.

Step 201, at media device, just dispose the IP contact method that is used for urgency traffic on the media device that media device, MGCF controlled that PSAP controlled, the NAT device, media device and guarantees: when need provide service for other session service, need be in the urgency traffic and the direct communication side reserved media face IP contact method of UE, when the medium face IP contact method of these reservations can only be used for urgency traffic and the UE direct communication.Be specially: when media device is received message into urgency traffic application media resource, for the medium face of this session distributes the IP contact method that only is used for urgency traffic.If what receive is the message of non-emergent professional application media resource, then can not be used in the IP contact method of urgency traffic for its medium face branch.

Step 202, on GGSN, dispose the filtering rule that comprises the IP contact method at emergency bearing resource, IP contact method in this filtering rule is the IP contact method that is used for urgency traffic in the functional entity that directly is connected by IP with UE in the urgency traffic, can limit UE by this filtering rule uses emergency bearing resource to send and receives the IP contact method that includes the relevant P-CSCF of urgency traffic, the IP contact method that is used for urgency traffic on the media device that PSAP controlled, the IP contact method that only is used for urgency traffic on the media device that MGCF controlled, the IP that only is used for the IP contact method of urgency traffic on the NAT device wraps.

The filtering rule of specific implementation can be diversified in actual applications, does not do qualification at this.

Do not have strict sequencing between the above-mentioned steps 201 and 202, and and step 203 between do not have strict time requirement, as long as before step 203, finish.

Step 203～step 204, UE initiates the resource bid request to inserting side, identifies the bearing resource of being applied for simultaneously and is used for urgency traffic.This is a process of creating PDP.

Step 205, UE sends the INVITE request by GGSN to P-CSCF.

Step 206, after GGSN received this INVITE request, because shown it is emergency bearing resource during the application resource, this moment, GGSN will use filtering rule to mate this IP bag.In this example, the destination of this IP bag is the IP contact method that meets the urgency traffic P-CSCF in the filtering rule, so P Passable.

Step 207～212 are changeed this INVITE that receives request, and are communicated that request to other relevant devices before the GGSN, receive 200 message afterwards, and send this 200 message to UE by GGSN.

Because the IP contact method of this P-CSCF passes through, therefore, its message that sends to UE can be by the filtration of GGSN, and, if be urgency traffic really, the IP contact method of the medium face that P-CSCF negotiates must be the IP contact method that is used for urgency traffic on the media device controlled of PSAP, perhaps, be to be used for the IP contact method of urgency traffic on the media device controlled of MGCF, or be used for the IP contact method of urgency traffic on the NAT device.

Step 213～step 214, UE initiates the bearing resource application of medium face, comprises the bearing resource that identifies this application simultaneously and is used for urgency traffic.This is the process creating or upgrade PDP.

Step 215～217, UE uses the medium face IP contact method that consults to send Media Stream, when this IP bag passes through the GGSN transfer, because this resource of GGSN record is used for urgency traffic, will use filtering rule to remove to mate this IP bag, if it is legal to mate, then this IP bag of GGSN forward pass wraps to illegal otherwise GGSN will judge this IP.

Be illegal packet in case discern certain IP bag, reality is just judged this calling abuse of emergency bearing resource, afterwards, can carry out relevant treatment, as blocks current call flow, and carries out respective record etc.

Referring to Fig. 4, present embodiment is by the callback of PSAP initiation to UE, and inserting side carrying control IP gateway is GGSN.In this example, the callback of PSAP also belongs to urgency traffic.

Step 301, at media device, just dispose the IP contact method that is used for urgency traffic medium face on the media device that media device, MGCF controlled that PSAP controlled, the NAT device, media device and guarantees: when need provide service for other session service, need be in the urgency traffic and the direct communication side reserved media face IP contact method of UE, when the medium face IP contact method of these reservations can only be used for urgency traffic and the UE direct communication.Be specially: when media device is received message into urgency traffic application media resource, will distribute the IP contact method that only be used for urgency traffic for the medium face of this session.If what receive is the message of non-emergent professional application media resource, then can not be used in the IP contact method of urgency traffic for its medium face branch.

Step 302, on GGSN, dispose the filtering rule that comprises the IP contact method at emergency bearing resource, IP contact method in this filtering rule is the IP contact method that is used for urgency traffic in the functional entity that directly is connected by IP with UE in the urgency traffic, can limit UE by this filtering rule uses emergency bearing resource to send and receives the IP contact method that includes the relevant P-CSCF of urgency traffic, the IP contact method that is used for urgency traffic on the media device that PSAP controlled, the IP contact method that only is used for urgency traffic on the media device that MGCF controlled, the IP that only is used for the IP contact method of urgency traffic on the NAT device wraps.

Do not have strict sequencing between the above-mentioned steps 301 and 302, and and step 303 between do not have strict time requirement, as long as before step 303, finish.

Step 303, PSAP initiates callback: if PSAP in the PSTN territory, the call request that PSAP sent is routed to the on-site MGCF of PSAP so, inserts the IMS territory by this MGCF then.That is to say, when PSAP need insert IMS, must be by the PSAP location, and promptly the calling party of institute roams on-site MGCF and inserts the IMS territory, when preventing PSAP callback roamer, inserts IMS from the MGCF of this user's ownership place.During specific implementation, can further distribute an independent number that is used for urgent call for PSAP, like this, so long as the calling that sends of number from then on, the network based number that is used for urgent call that is PSAP distributed is the number of caller, route the call to the on-site MGCF of PSAP, insert IMS, thereby realize that roaming on-site MGCF from the calling party of institute inserts IMS.

It is a urgency traffic callback request that MGCF wants to discern this request.Concrete recognition methods has: some numbers of configuration on MGCF, and all callers are exactly the callback request of urgent call for the request of this number; Perhaps, in PSAP issues the message of MGCF, carry indication, indicate that this is the callback request of a urgent call.MGCF will distribute the IP contact method of reserving on the media device that MGCF controlled that only is used for urgency traffic for the medium face of this emergent operation request.

If PSAP is in the IP territory, PSAP carries the medium face IP contact method that is used for urgency traffic and initiates the INVITE conversation request to UE so.

Step 304, P-CSCF passs GGSN with the INVITE of receiving.

Step 305, because callback is to occur in UE to initiate after the urgent call, and indicated that when UE initiates urgent call its carrying that is used to receive INVITE is a urgency traffic, so GGSN will use the IP that receives at the filtering rule coupling of emergency bearing resource configuration to wrap.Because this bag sends over from specifying P-CSCF, thus can be by filtering, promptly this IP bag is legal bag, GGSN continues subsequent operation afterwards.

Step 306, GGSN sends to UE with this request.

Step 307～308, the medium face application bearing resource of UE for consulting, owing to be urgency traffic, therefore, UE can carry the emergency bearing indication to represent that this bearing resource is used for urgency traffic in bearing request message.This process is the process creating or upgrade PDP.

Step 309, after the success of application bearing resource, UE sends and consults i.e. 200 message of successful response message.The destination address of this message is PSAP, and this message is by the GGSN transfer.

Step 310～312, after GGSN receives 200 message from UE, because its bearing resource of applying for is indicated it is emergency bearing, so GGSN will use filtering rule to remove to mate this IP to wrap, coupling by after be transmitted to related entities by P-CSCF again, as E-CSCF etc.

Step 313, media device send media information IP and wrap to GGSN, if in the IP territory, then send this media information IP bag by the media device that PSAP controlled, PSTN territory in this way, and then PSAP sends this media information IP bag by the media device that MGCF controlled.If there is NAT device the centre, then by sending the media information bag behind the NAT device.

Step 314, GGSN determines that it is emergency bearing resource that this IP wraps employed bearing bed resource after receiving media information IP bag, thereby use filtering rule to remove to mate this IP bag, coupling if it fails to match, then is judged to be abuse of emergency bearing resource by back execution in step 315.Afterwards, can carry out relevant treatment, as block current call flow, and carry out respective record etc.

Step 315, the legal IP bag that GGSN will pass through filtering rule sends to UE.

Be that GGSN is that example describes to insert side carrying control IP gateway only below, inserting side carrying control IP gateway in actual applications can also be other logic entities, as packet data serving node (PDSN) etc.

The invention also discloses a kind of access side carrying control IP gateway, it comprises:

The filtering rule memory module is used to preserve the filtering rule that comprises the IP contact method at the emergency bearing resource setting, and this IP contact method is the IP contact method that is used for urgency traffic in the functional entity that directly is connected by IP with UE in the urgency traffic,

Above-mentionedly directly comprise: the pairing entity in signaling purpose IP address that UE sends, and the pairing media device in medium purpose IP address that sends of UE by the functional entity that IP is connected with UE;

Above-mentioned media device comprises media device that media device, MGCF controlled and the network address translation device that PSAP controls.

Above-mentioned access side carrying control IP gateway comprises GGSN, PDSN etc.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.

Claims

1. the method for identification abuse of emergency bearing resource among the IP Multimedia System IMS, it is characterized in that, setting comprises the filtering rule of IP contact method at emergency bearing resource inserting side carrying control IP gateway, this IP contact method used sign when communicating by IP, only be used for being identified at urgency traffic, the urgency traffic of the functional entity that directly is connected by IP with UE, this method also comprises:

2. method according to claim 1 is characterized in that,

Describedly directly comprise: the pairing entity in signaling purpose IP address that UE sends, and the pairing media device in medium purpose IP address that sends of UE by the functional entity that IP is connected with UE.

3. according to claim 2 described methods, it is characterized in that: described media device comprises media device that media device, MGCF controlled and the network address translation device that PSAP controls.

4. method according to claim 2 is characterized in that, if described media device is not to be exclusively used in urgency traffic, then for only be used for the medium face IP contact method of urgency traffic in the urgency traffic with direct communication side's reservation of UE.

5. method according to claim 4, it is characterized in that, the message that goes out to receive when certain Entity recognition that is arranged in signaling paths is used for urgency traffic, directly or indirectly when media device application media resource, carry and show it is indication for media resource that urgency traffic is applied for, described media device of accepting applications distributes the medium face IP contact method of being reserved for the direct communication side of this UE.

6. method according to claim 1, it is characterized in that, described when communicating by IP used sign be one of sign of the communication protocol sign session on SPI, gre tunneling sign or the IP layer of IP address, port, IPSEC, also can be above all combination in any.

7. method according to claim 1 is characterized in that, described calling procedure is initiated by UE or initiated by PSAP.

8. method according to claim 7 is characterized in that, when described calling is initiated by PSAP, and this PSAP is when being positioned at non-IP territory, and described PSAP inserts the IMS territory by the on-site MGCF of PSAP.

9. method according to claim 8 is characterized in that, when described PSAP was positioned at non-IP territory, described PSAP by the process that the on-site MGCF of PSAP inserts the IMS territory was:

For PSAP distributes an independent number that is used for urgent call;

Network based is the number that is used for urgent call as caller that PSAP distributed, and routes the call to the on-site MGCF of PSAP, inserts the IMS territory.

10. one kind is inserted side carrying control IP gateway, it is characterized in that, comprising:

11. access side carrying control IP gateway according to claim 10 is characterized in that,

Describedly directly comprise: the pairing entity in signaling purpose IP address that UE sends, and the pairing media device in medium purpose IP address that sends of UE by the functional entity that IP is connected with UE;

Described media device comprises media device that media device, MGCF controlled and the network address translation device that PSAP controls.

12. access side carrying control IP gateway according to claim 10 is characterized in that, described access side carrying control IP gateway comprises GGSN GGSN, packet data serving node PDSN.