CN101374345A

CN101374345A - A method, device and system for wireless virtual private network VPN short number transfer of calling users

Info

Publication number: CN101374345A
Application number: CNA2008101425450A
Authority: CN
Inventors: 李世前
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2008-07-24
Filing date: 2008-07-24
Publication date: 2009-02-25
Anticipated expiration: 2028-07-24
Also published as: CN101374345B

Abstract

The present invention discloses a method, device and system for transferring a wireless virtual private network VPN short number of a calling user, wherein the method includes: after the calling user initiates a VPN call to the called user, the called user The home location register of the calling user obtains the VPN short number of the calling user from the corresponding service control point SCP of the VPN call; the home of the called user passes the obtained VPN short number of the calling user to The mobile switching center where the called user is currently located. This solution does not require a large number of modifications to the mobile switching equipment, and is more convenient and easy to implement.

Description

The methods, devices and systems that a kind of calling subscriber's wireless virtual private network VPN short number transmits

Technical field

The present invention relates to communication technical field, particularly the methods, devices and systems of a kind of calling subscriber's wireless virtual private network VPN short number transmission.

Background technology

MVPN (MobileVirtual Private Network, wireless virtual private network) hereinafter to be referred as VPN, this business is to utilize the resource of CDMA net, fixed network and GSM net to provide a private network in logic to some enterprise, group etc., for these enterprises, group in this private network to CDMA user, GSM user, PSTN user's open service.

In a group of virtual private mobile network service, the true number (also can be called trombone) that each telephone number not only has operator to distribute, VPN group oneself can distribute a short codes for each VPN user simultaneously, when group internal is called mutually, can directly use short codes.And called subscriber side's " caller identification " display of calling user VPN user cornet is very important traffic performance of vpn service, cornet is memory easily not only, conveniently dial, and the user whether also be easy to distinguish current calling according to cornet be the calling of same group internal, make the user fully experience the superiority of vpn service.

The GSM standard realizes that the method for calling subscriber's short codes transmission and demonstration is in the prior art, service control point (Service Contro1 Point, SCP) calling subscriber user's long code is translated into short codes after, in the service mobile switch/VLR Visitor Location Register current (the application is called calling subscriber MSC/VLR1) mutual, carry to MSC/VLR1 with calling subscriber user, MSC/VLR1 and then send it to called subscriber's MSC/VLR2 is shown to the called subscriber when the continuing called subscriber by MSC/VLR2.

Because having corresponding protocol, cdma system do not support to transmit between originating MS C/VLR1 and the SCP calling subscriber's cornet, therefore, realize that this scheme need revise originating MS C/VLR1 and the interface of ownership between SCP, because mobile subscriber's roaming characteristic, calling subscriber user may roam in the net and make a call under any MSC/VLR, so guaranteeing the demonstration of calling subscriber's cornet can normally use in any roaming place, with regard to need to require all MSC/VLR in the net all make amendment with possess with SCP obtain alternately calling subscriber's short codes ability, this needs the cooperation of whole network, and operation is promoted to get up to have difficulties.

Summary of the invention

The present invention is directed to and realize in the prior art that vpn service transmission calling subscriber short codes needs the mobile switch equipment of the whole network to transform, the methods, devices and systems that provide a kind of wireless virtual private network VPN short number of changing less calling subscriber to transmit are provided and the bigger problem of popularization difficulty.

In order to realize purpose of the present invention, embodiments of the invention provide following technical scheme:

A kind of calling subscriber's wireless virtual private network VPN short number transmission method comprises:

Behind the Virtual Private Network call of calling subscriber's initiation to the called subscriber, described called subscriber's attaching position register obtains described calling subscriber's VPN cornet from described Virtual Private Network call corresponding business control point;

The described calling subscriber's that described called subscriber's ownership will get access to VPN cornet passes to described called subscriber's mobile switching centre

A kind of attaching position register comprises:

The cornet acquiring unit is used for obtaining described calling subscriber's VPN cornet from described Virtual Private Network call corresponding business control point behind the Virtual Private Network call of calling subscriber's initiation to the called subscriber;

The cornet transfer unit is used for described calling subscriber's VPN cornet being passed to described called subscriber's mobile switching centre after getting access to described calling subscriber's VPN cornet.

A kind of communication system of carrying out vpn service comprises:

Called subscriber's attaching position register, be used for behind the Virtual Private Network call of calling subscriber's initiation the called subscriber, obtain described calling subscriber's VPN cornet from described Virtual Private Network call corresponding business control point, described calling subscriber's VPN cornet is passed to the mobile switching centre at the current place of described called subscriber;

Service control point is used for providing to described called subscriber's attaching position register described calling subscriber's VPN cornet.

In the method that the embodiment of the invention provides, called subscriber's attaching position register obtains calling subscriber VPN cornet from the service control point (SCP), and it is passed to the mobile switching centre at the current place of called subscriber, realized that the called subscriber obtains also display of calling user's VPN cornet in call proceeding, this scheme does not need mobile switch equipment is transformed in a large number, realize more convenient, easy to implement.

Description of drawings

Fig. 1 is a system configuration schematic diagram of the present invention's utilization;

Fig. 2 is the schematic flow sheet of the inventive method embodiment one;

Fig. 3 is the schematic flow sheet of the inventive method embodiment two;

Fig. 4 is the composition frame chart of apparatus of the present invention embodiment.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer,, embodiments of the invention are further elaborated below in conjunction with drawings and Examples.

At first, introducing a system configuration schematic diagram of the present invention's utilization, as shown in Figure 1, is the basic block diagram of intelligent network, and wherein SCP plays a part control and handles IN service in whole intelligent net system; MSC/VLR (SSP) mainly finishes Service Switching Function and CCF; Attaching position register HLR mainly is the essential information that is used to preserve mobile phone, comprises the signing service information that is used for intelligent call, and when mobile phone location upgraded (mobile phone power-on or mobile phone location change), HLR sent to VLR with these information.

The inventive method embodiment one, the embodiment of the invention one mainly belongs to interface between HLR and the SCP by the expansion called subscriber, make that HLR can be from VPN SCP (corresponding SCP of calling subscriber and the corresponding SCP of called subscriber when vpn service takes place, in general be same SCP, even the situation that both are not same, from vpn service, also can regard a VPN in logic as, in the embodiment of the invention the corresponding SCP of Virtual Private Network call is referred to as VPN SCP) obtain calling subscriber's VPN cornet, and this calling subscriber's who gets access to VPN cornet is delivered to called subscriber MSC/VLR.As Fig. 2, the embodiment of the invention one realizes that the flow process of calling subscriber VPN cornet transmission comprises:

Step S201: the calling subscriber initiates the call request to called subscriber's vpn service, called subscriber's cornet and calling subscriber's sign are carried in described call request, and (sign of the user among the application is relative with VPN cornet among the application, the number that it can comprise user's trombone and other this user's non-VPN cornet for example comprises numbers such as Mobile Subscriber International ISDN number MSISDN, international mobile subscriber identity IMSI, Mobile Directory Number MDN, Directory Number DN);

Step S202: after calling subscriber MSC/VLR1 receives the Virtual Private Network call request, obtain called subscriber's sign (trombone) from VPN SCP according to called subscriber's VPN cornet;

Step S203: calling subscriber MSC/VLR1 belongs to HLR request called subscriber's positional information (transmission location information request message) to the called subscriber according to called subscriber's sign;

Step S204: the called subscriber belongs to HLR obtains the calling subscriber from VPN SCP VPN cornet, in the present embodiment, specific implementation belongs to HLR by the called subscriber and obtains request to VPN SCP transmission VPN cornet, wherein, calling subscriber's sign and called subscriber's sign have been carried in this request, after VPN SCP receives this request message, determine VPN group under the calling and called user according to calling subscriber's sign and called subscriber's sign, determine calling subscriber's VPN cornet again according to determined group, and calling subscriber's VPN cornet is returned to the called subscriber belong to HLR; Need to prove, in other execution modes of the present invention, when the only signatory VPN group of calling and called, SCP determines that the VPN group under the calling and called user also can only can implement according to calling subscriber's sign, in such cases, the sign that the VPN cornet that HLR the sends request of obtaining only need be carried the calling subscriber gets final product, if during the signatory situation more complicated of the VPN of calling and called, SCP determines that the VPN group under the calling and called user also needs other information, for example SCP determines together according to calling and called user's sign in the foregoing description, in such cases, the VPN cornet request of obtaining that HLR sends need be carried calling subscriber's sign and called subscriber's sign, also having a kind of situation in addition is that SCP need can determine VPN group under the calling and called user according to VPN sign, this VPN sign can be that the calling subscriber is increased in prefix before called subscriber's cornet when calling out (as 001+007, the 001st, the VPN sign, the 007th, called subscriber's cornet), the network element that also can be network side is determined the sign that the back increases according to call information, its specific implementation embodiment of the invention is not done qualification, in such cases, the VPN cornet request of obtaining that HLR sends need be carried calling subscriber's sign and VPN sign, comprehensive above-mentioned several situations are when SCP can not only determine VPN group according to calling subscriber's sign; Need to prove that still can calling subscriber's cornet be sent to the called subscriber by VPN SCP active in other execution mode of the present invention and belong to HLR, and not need the called subscriber to belong to the request of HLR, specific implementation does not repeat them here;

Step S205: the called subscriber belongs to HLR the calling subscriber's that gets access to VPN cornet is sent to called subscriber MSC/VLR2;

Step S206: called subscriber MSC/VLR2 passes to the called subscriber with calling subscriber VPN cornet in call proceeding, so that called subscriber's terminal display of calling user's cornet.

The embodiment of the invention one is in order to realize a kind of transmission of convenient and simple calling subscriber's cornet, mainly the called subscriber is belonged to and expand cooperating between HLR and the VPN SCP, ownership HLR and VPN SCP by the called subscriber obtain calling subscriber VPN cornet alternately, and it is transmitted to called subscriber MSC/VLR2, realized that the called subscriber obtains also display of calling user's VPN cornet in call proceeding, because the mainly storage and the maintenance of the user's in responsible a certain area subscription data of HLR in the network, configuration in network is lacked than MSC, therefore, the embodiment of the invention one need not the corresponding transformation of whole net MSC/VLR and cooperates, only need the SCP of user attaching, HLR supports just can guarantee no matter the user roams into to realize the demonstration of VPN cornet under which MSC/VLR, change amount to network is less, easy to implement; Secondly, because the user of signatory vpn service is the user of areal mostly, its attaching position register mostly is identical HLR greatly, therefore, only corresponding SCP, HLR are transformed and to implement this business, need not the whole network SCP, HLR are transformed and can implement this vpn service at local network at local network; In addition, in general, the HLR of a local network or SCP are the equipment of same producer, so convenient when transforming the business of formation also satisfies the demand of operator easily easily, form differential competition.

The inventive method embodiment two, and as shown in Figure 3, present embodiment two is an example with the cdma system, realizes that therein the flow process of calling subscriber's cornet transmission comprises:

Step S301: calling subscriber MSC/VLR1 receives the call request of calling subscriber's initiation to the called subscriber, and called subscriber's cornet and calling subscriber's sign are carried in described call request;

Step S302: it is CDMA intelligent subscriber that calling subscriber MSC/VLR1 analyzes the calling subscriber, and detects the Origination_Attempt_Authorized intelligent contactor, and the address of then pressing in the trigger sends ORREQ message to VPN SCP;

After step S303:VPN SCP receives ORREQ message, the calling subscriber is carried out authentication, at first analyze the calling subscriber and whether registered vpn service,, then cut off and call out if do not register vpn service; Whether the cornet of further analyzing the called subscriber is effective, and promptly Query Database obtains the trombone of cornet correspondence, if do not inquire corresponding trombone, then cuts off and calls out; Issue the orreq response message then to calling subscriber MSC/VLR1, wherein carry called subscriber's sign in the orreq response message;

Step S304: the calling subscriber triggers calling subscriber's routing address can use Calling Routing AddressAvailable trigger, calling subscriber MSC/VLR1 detects the Calling_Routing_address_Available trigger, sends an ANLYZD message to VPN SCP;

After step S305:VPN SCP receives an ANLYZD message, the calling subscriber is done further authentication, judge whether user balance is enough to initiate this time calling, judging finishes returns an anlyzd message to calling subscriber MSC/VLR1, if remaining sum is enough, carry out subsequent step, otherwise, interrupt this time calling out; Present embodiment enough is an example with remaining sum;

Step S306: the called subscriber triggers intelligent call, calling subscriber MSC/VLR1 detects portable terminal Mobile_Termination trigger, send primary importance information request LOCREQ message to called subscriber's ownership HLR, have the Mobile_Termination trigger in this message;

Step S307: called subscriber's ownership HLR returns called subscriber's intelligent characteristic, promptly return primary importance request response locreq message, this message comprises list of triggers information: initial terminal InitialTermination, location Location, called subscriber's routing address can be used triggers such as Called Routing AddressAvailable;

Step S308: calling subscriber MSC/VLR1 detects Initial Termination trigger, sends the 2nd ANLYZD message to VPN SCP, carries calling subscriber identification (trombone) and CSI called subscriber identification (trombone is as MDN) in this message;

After step S309:VPN SCP receives the 2nd ANLYZD message, the called subscriber is carried out authentication, whether the vpn service of judging the called subscriber activates and whether remaining sum is enough to initiate this time calling, and judging finishes returns the 2nd anlyzd message to calling subscriber MSC/VLR1;

Step S310: calling subscriber MSC/VLR1 detects the Location trigger, belongs to HLR to the called subscriber and sends second place information request LOCREQ message to obtain called subscriber's routing iinformation;

Step S311: after the called subscriber belongs to HLR and receives the 2nd LOCREQ message, send the VPN cornet to VPN SCP and obtain request, this request can adopt existing messaging service request such as SERVICE_REQ (to carry SRVID=126, calling identification, called identification, wherein SRVID=126 sign VPN cornet inquiry), also can increase a new message newly, calling and called user's sign is carried in this request;

Step S312:VPN SCP receives after the VPN cornet obtains request, at first need to analyze VPN group under the calling and called user according to calling subscriber identification and CSI called subscriber identification, this calling is the calling of same group inside, analyze called subscriber's display mode then, " caller identification " mode of judging the called subscriber is display of calling user's a cornet, Query Database then, sign by the calling subscriber inquires its corresponding VPN cornet, and this calling subscriber VPN cornet is obtained request response by the VPN cornet return to the called subscriber and belong to HLR, this calling subscriber's cornet can be carried in videotex DisPlayText or the caller number CallingPartyNumberString parameter; Need to prove, present embodiment two is to belong to HLR with the called subscriber to receive and start the VPN cornet after the 2nd LOCREQ message and obtain request, in other embodiments of the invention, the called subscriber belongs to HLR and also can promptly start the VPN cornet after receiving a LOCREQ message and obtain request, at this moment, if receive calling subscriber's cornet, the called subscriber belongs to HLR and need preserve this calling subscriber's cornet and give called subscriber MSC/VLR2 in order to subsequent delivery;

Step S313: after the called subscriber belongs to the cornet that HLR receives the calling subscriber, determine that the called subscriber needs display of calling user's cornet, then send route request information to called subscriber MSC/VLR2, in this route request information, use the calling subscriber's cornet that gets access to replace the calling subscriber identification that in the 2nd LOCREQ message, receives, calling subscriber's cornet is passed to called subscriber MSC/VLR2; Concrete, the described calling subscriber's that described called subscriber's ownership HLR will get access to VPN cornet substitutes described calling subscriber's sign, and described calling subscriber's VPN cornet is carried at the MSC that is sent to described called subscriber in the route request information;

Step S314 is to step 315: after called subscriber MSC/VLR2 receives ROUTEREQ message, for the called subscriber distributes roaming number TLDN, and this TLDN is returned to the called subscriber by the routereq response message belong to HLR, the called subscriber belongs to HLR this roaming number is forwarded to calling subscriber MSC/VLR1;

Step S316 is to step 317: calling subscriber MSC/VLR1 detects called subscriber's routing address can use called Routing Address Available trigger, send the 3rd ANLYZD message to VPN SCP, VPN SCP does further authentication to the called subscriber, this authentication is mainly analyzed the parameter information that can't obtain in the last ANLYZD message, determine the rate of this calling, return the 3rd anlyzd response message then, indication continues continuing called subscriber;

Step S318 is to step 319: calling subscriber MSC/VLR1 sets up according to roaming number and is connected with the calling of called subscriber MSC/VLR2, called subscriber MSC/VLR2 replay call, and in continuing will before the calling subscriber's that gets access to cornet pass to called user terminal, make called user terminal display of calling user's cornet.

The inventive method embodiment two, belong to HLR initiatively to VPN SCP acquisition request calling subscriber cornet by the called subscriber, and it is transmitted to called subscriber MSC/VLR2 in route requests, realized that the called subscriber obtains also display of calling user's cornet in call proceeding, need not the corresponding transformation of whole net MSC/VLR cooperates, only need SCP, the HLR of user attaching to support just can guarantee no matter the user roams into to realize the demonstration of VPN cornet under which MSC/VLR, change amount to network is less, easy to implement; Secondly, because the user of signatory vpn service is the user of areal mostly, its attaching position register mostly is identical HLR greatly, therefore, only corresponding SCP, HLR are transformed and to implement this business, need not the whole network SCP, HLR are transformed and can implement this vpn service at local network at local network; In addition, in general, the HLR of a local network or SCP are the equipment of same producer, so convenient when transforming the business of formation also satisfies the demand of operator easily easily, form differential competition.

The inventive method embodiment three, be with method embodiment two differences, after called ownership HLR obtains calling subscriber VPN cornet from VPN SCP, can also in position request response locreq message, this caller VPN cornet be carried to caller MSC/VLR1 or gateway exchange switching equipment, be responsible for caller VPN cornet is passed to called MS C/VLR2 by caller MSC/VLR1 or critical point switching equipment then, so that terminal called shows.Embodiment does not repeat them here.

Need to prove that the invention described above embodiment concentrates with MSC and VLR and is set to example, in fact, VLR can also be provided with separately, and that carry out the related function of the embodiment of the invention mainly is MSC.

Apparatus of the present invention embodiment one, and as shown in Figure 4, a kind of attaching position register that the embodiment of the invention provides comprises:

Cornet acquiring unit 40 is used for obtaining described calling subscriber's VPN cornet from described Virtual Private Network call corresponding business control point SCP behind the Virtual Private Network call of calling subscriber's initiation to the called subscriber;

Cornet transfer unit 42 is used for after getting access to described calling subscriber's VPN cornet, described calling subscriber's VPN cornet is passed to the moving exchanging center MSC (being called subscriber's MSC) at the current place of described called subscriber.

Concrete, cornet acquiring unit 40 comprises:

Request module 400, be used for sending the VPN cornet and obtain request message to described Virtual Private Network call corresponding business control point SCP, described request message is carried described calling subscriber's sign, perhaps described calling and called user's sign, perhaps described calling subscriber's sign and VPN sign;

Receiver module 402 is used to receive the sign of the corresponding SCP of described Virtual Private Network call according to described calling subscriber, perhaps described calling and called user's sign, and perhaps described calling subscriber's sign and VPN identify the described calling subscriber's who determines VPN cornet.

Described cornet transfer unit 42 comprises:

Routing module 420, the VPN cornet that is used for the described calling subscriber that will get access to is carried at the MSC that route request information is sent to described called subscriber; And/or

Location information request respond module 422, VPN cornet in order to the described calling subscriber that will get access to is carried at MSC or the gateway exchange switching equipment that sends to the calling subscriber in the location information request response message of position, so that calling subscriber's MSC or gateway exchange switching equipment are passed to described calling subscriber's VPN cornet described called subscriber's MSC.

The attaching position register that present embodiment provides obtains calling subscriber's cornet from VPN SCP, and it is passed to the mobile switching centre at the current place of called subscriber, realized that the called subscriber obtains also display of calling user's cornet in call proceeding, this scheme does not need mobile switch equipment is carried out a large amount of transformations, realize more convenient, easy to implement.

A kind of communication system of carrying out vpn service that system embodiment of the present invention, the embodiment of the invention provide comprises:

Calling subscriber mobile switching centre, be used to receive Virtual Private Network call request to the called subscriber, called subscriber's cornet and calling subscriber's sign are carried in described call request, obtain called subscriber's sign from SCP according to described called subscriber's cornet, and according to described called subscriber's the sign positional information to described called subscriber's ownership HLR request called subscriber, described location information request message is carried described calling subscriber's sign;

Called subscriber's attaching position register, be used for after receiving the location information request message that described calling subscriber mobile switching centre sends described called subscriber, obtain calling subscriber's VPN cornet from SCP, and the calling subscriber's cornet that gets access to is passed to called subscriber's switching center; In other execution mode outside present embodiment, described HLR only need obtain described calling subscriber behind the Virtual Private Network call of calling subscriber's initiation to the called subscriber VPN cornet gets final product;

Service control point is used for providing according to called subscriber's cornet called subscriber's sign, and according to described calling subscriber's sign, perhaps described calling and called user's sign, perhaps described calling subscriber's sign and VPN sign provides calling subscriber's VPN cornet;

Called subscriber's mobile switching centre (being the mobile switching centre at the current place of called subscriber), the cornet that is used for the calling subscriber that will get access to passes to called user terminal in call proceeding, makes called user terminal show described calling subscriber's cornet.

Called subscriber's attaching position register of the communication system that present embodiment provides obtains calling subscriber VPN cornet from the service control point (SCP), and it is transmitted to the mobile switching centre at the current place of called subscriber, realized that the called subscriber obtains also display of calling user's cornet in call proceeding, this scheme does not need mobile switch equipment is transformed in a large number, realize more convenient, easy to implement.

One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium.The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.

Claims

1. a wireless virtual private network VPN short number transfer method of a calling user, is characterized in that, comprising:

After the calling user initiates a VPN call to the called user, the home location register of the called user obtains the VPN short number of the calling user from the corresponding service control point of the VPN call;

The home of the called user transmits the acquired VPN short number of the calling user to the mobile switching center of the called user.

2. The method according to claim 1, wherein, before the HLR of the called user obtains the VPN short number of the calling user from the corresponding service control point of the VPN call, the method further includes:

The home location register of the called user receives the location information request message sent by the mobile switching center of the calling user, and the location information request message carries the identity of the calling and called users, or the identity of the calling and called users and VPN ID.

3. The method according to claim 2, wherein the HLR of the called user obtains the VPN short number of the calling user from the corresponding service control point of the VPN call specifically comprises:

The home location register of the called user sends a VPN short number acquisition request to the service control point corresponding to the VPN call, and the VPN short number acquisition request carries the identification of the calling user, or the ID of the calling user and the called user. ID, or the ID of the calling user and the VPN ID;

The home location register of the called user receives a VPN short number acquisition request response carrying the VPN short number of the calling user sent by the service control point corresponding to the VPN call, wherein the VPN short number of the calling user The corresponding service control point for the VPN call is determined according to the identity of the calling user, or the identity of the calling user and the called user, or the identity of the calling user and the VPN identity.

4. The method according to claim 3, wherein the VPN short number acquisition request is a service request message between the home location register of the called user and the corresponding service control point of the VPN call, wherein , the service request message carries a VPN short number query indication.

5. The method according to claim 1, wherein the HLR of the called user transfers the acquired VPN short number of the calling user to the Mobile Switching Center of the called user. :

The home location register of the called user carries the acquired VPN short number of the calling user in a routing request message and transmits it to the mobile switching center of the called user.

6. The method according to claim 1, wherein the HLR of the called user transfers the obtained VPN short number of the calling user to the Mobile Switching Center of the called user. :

The home location register of the called user carries the obtained VPN short number of the calling user in a location request response message and transmits it to the mobile switching center or gateway switching equipment of the calling user, so that the The mobile switching center of the calling user or the switching equipment of the gateway office sends the VPN short number of the calling user to the mobile switching center of the called user.

7. The method according to claim 1, 5 or 6, wherein the home location register of the called user transfers the obtained VPN short number of the calling user to the mobile phone number of the called user After the exchange also includes:

The mobile switching center of the called user transfers the VPN short number of the calling user to the terminal of the called user during the call connection process, so that the terminal of the called user can display it.

8. A home location register, characterized in that it comprises:

A short number obtaining unit, used to obtain the VPN short number of the calling user from the corresponding service control point of the VPN call after the calling user initiates a VPN call to the called user;

The short number transfer unit is configured to transfer the VPN short number of the calling user to the mobile switching center of the called user after obtaining the VPN short number of the calling user.

9. The HLR according to claim 8, wherein the short number obtaining unit comprises:

The request module is configured to send a VPN short number acquisition request message to the service control point SCP corresponding to the VPN call, the request message carrying the identity of the calling user, or the identity of the calling and called user, or the Caller ID and VPN ID;

A receiving module, configured to receive the VPN call and the corresponding SCP determines the calling user according to the identity of the calling user, or the identity of the calling and called user, or the identity of the calling user and the VPN identity VPN short number.

10. The HLR according to claim 8, wherein the short number transfer unit comprises:

A routing module, configured to carry the acquired VPN short number of the calling user in a routing request message and send it to the mobile switching center of the called user; and/or

The location information request response module is used to carry the obtained VPN short number of the calling user in the location information request response message and send it to the mobile switching center or gateway switching equipment of the calling user, so that all The mobile switching center of the calling user or the switching equipment of the gateway office transfers the VPN short number of the calling user to the mobile switching center of the called user.

11. A communication system for performing VPN services, comprising:

The called user home location register is used to obtain the VPN short number of the calling user from the corresponding service control point of the VPN call after the calling user initiates a VPN call to the called user, and transfer the calling user The VPN short number is delivered to the mobile switching center where the called user is currently located;

The service control point is configured to provide the calling user's VPN short number to the called user's home location register.

12. The system according to claim 11, further comprising:

The mobile switching center of the called user is configured to transfer the obtained VPN short number of the calling user to the terminal of the called user during the call connection process, so that the terminal of the called user can display it.