CN101278272B

CN101278272B - Network routing

Info

Publication number: CN101278272B
Application number: CN2006800360388A
Authority: CN
Inventors: 柯蒂斯·E·艾伦; 菲利普·D·克拉布尔; 马里亚弗兰卡·格雷戈拉特; 史蒂文·L·拉斯; 理查德·L·麦克克莱恩; 桑德拉·A·帕耶蒙特; 蒂莫西·德怀特; 詹姆斯·L·维拉尔; 戴永华; 格雷戈里·韦尔奇; 亚龙·拉普斯
Original assignee: MCI LLC
Current assignee: Verizon Business Global LLC; Verizon Business Financial Management Corp
Priority date: 2005-07-29
Filing date: 2006-07-31
Publication date: 2011-03-16
Anticipated expiration: 2026-07-31
Also published as: CN101518015A; CN101278273B; CN101278273A; CN101278272A

Abstract

At least one device receives a call request from a calling party to a called party. The device routes the call request to an Internet Protocol Multimedia Subsystem (IMS) core when a first condition is met and bypasses the IMS core when a second condition is met.

Description

The network Route Selection

Priority information

The application has required the U.S. Provisional Patent Application submitted on July 29th, 2005 number 60/703, the right of priority of 812 (agent docket COS05011PR) and the U.S. Provisional Patent Application number 60/764,748 (agent docket COS05011PR2) submitted on February 3rd, 2006.All quote for your guidance in this content these two provisional application.

Background technology

Internet protocol multimedia subsystem (IMS) provides and has moved and fixedly multimedia service.The purpose of IMS not only is new service is provided, and all services of providing the present and the future the Internet to be provided are provided.In this manner, IMS has given each is served the ability of control and charge to Virtual network operator and service supplier.In addition, given from the ability of their home network and execution service when described user is roaming to the user.

Description of drawings

The accompanying drawing of incorporating into and constituting this instructions part illustrates embodiments of the invention, and is used for explaining the present invention together with the description.In the accompanying drawings,

Fig. 1 illustrates the example system that wherein can realize according to the system and method for the principle of the invention;

Fig. 2 illustrates the exemplary configuration of the introducing gateway control function (BIGCF) of Fig. 1;

Fig. 3 illustrates the performed example process by the BIGCF of Fig. 1;

Fig. 4 A-4C illustrates the processing of Fig. 3 in further detail; With

Fig. 5-12 illustrates the example of handling described in Fig. 3 and 4A-4C.

Embodiment

Following detailed description according to the implementation of the principle of the invention relates to accompanying drawing.Identical Reference numeral can identify identical or similar element in different accompanying drawings.And, below describe in detail and unrestricted the present invention.But scope of the present invention is limited by claims and equivalent thereof.

The realization that meets the principle of the invention relates to and is relevant to Internet protocol (IP) IP multimedia subsystem, IMS (IMS) (being also referred to as " IMS core " or " IMS platform ") and comes the route portfolio.Handle and route definite during, the IMS core can be used for from each origin to each destination route multimedia call/data session that may call value-added service.For operating efficiency (that is, postponing), those do not relate to IMS subscriber end points or can walk around the IMS core based on the calling that IMS uses.

Should be appreciated that employed telephoning telephony term has covered the PSTN structure based on the U.S. here.Implementation according to the principle of the invention is not limited to this.For example, the implementation according to the principle of the invention is equally applicable to other communication network.

Exemplary system

Fig. 1 illustrates the example system 100 that wherein can realize according to the method and system of the principle of the invention.As illustrated, system 100 can comprise: service call conversation control function (S-CSCF) 102, enquiry call conversation control function (I-CSCF) 104, Proxy Call Session Control Function (P-CSCF) 106, local subscriber server (HSS) 108, precalculated position function (SLF) 110, two media gateway (MGW) function 112, two MGCFs (MGCF) 114, share local gateway (SLG) 116, network gateway (NGW) 118, draw gateway control function (BGCF) 120, introduce gateway control function (BIGCF) 122, Multimedia Resource Function (MRF) 124, one or more application servers 132, service creation environment (SCE) logical one 34, host's service (CENTREX) 136 of Internet protocol central office exchange, unified message sends service (UM) 138, carrier wave application service (AS) 140, group list management server (GLMS) 142, existent service 144, telephone number mapping (ENUM) server 146, access session boarder controller (A-SBC) 148, Session Border Controller (I-SBC) 150 interconnects between net, policy engine 152, policy decision function (PDF) 154, resource management function (RM) 156, charge function (CF) 158, charge data function (CDF) 160, charging gateway function (CGF) 162 and generic user profile (GUP) 164, wherein said Multimedia Resource Function (MRF) 120 can comprise Multimedia resource function controller (MRFC) (MRFC) 126, Multimedia resource function processor (MRFP) (MRFP) 128 and media resource agency (MRB) 130.Although do not describe in Fig. 1, yet the IMS core for example can comprise S-CSCF 102, I-CSCF 104, P-CSCF 106 and HSS 108.For simply, provide illustrated assembly numbering in Fig. 1.In practice, exemplary systems can comprise than illustrated more or less assembly among Fig. 1.Should be appreciated that in addition the IMS standard just constantly develops.Implementation as described herein is equally applicable to the present and the future's IMS standard.

A. call session Control Component

S-CSCF 102, I-CSCF 104 and P-CSCF 106 can be considered to the call session Control Component in the system 100.Calling out Control Component can be responsible for coming analysis session (for example, session initiation protocol (SIP)) and applied logic (for example, business logic, service logic, operation logic etc.) by each incident.The result of session control is routed to incident suitable assembly and/or adds SIP stem and value.

S-CSCF 102 can be regarded as the brain of IMS core.S-CSCF 102 can carry out session control and registration service for the user of IMS core.S-CSCF 102 can receive the session that user profiles and route IMS user (also being known as " IMS subscriber " or " subscriber ") are asked from HSS 108.In addition, S-CSCF 102 can be according to carrying out authentification of user from the information of HSS 108.

In some implementations, S-CSCF 102 can comprise service ability interaction manager (SCIM) and resource management (RM) function.SCIM can be responsible for striding each service coordination one or more application services are provided, so that technology and platform can generate valuable service for IMS user.RM can be responsible for by distributing suitable resource to carry out business rules and service level agreement (SLA).

I-CSCF 104 can serve as the main communication center that is connected to the subscriber who is served by other IP network.I-CSCF 104 can be positioned at the edge of IMS core.I-CSCF 104 can receive sip message and identify next hop of described sip message.In order to realize this point, I-CSCF 104 can be to the position (for example, the address) of the suitable S-CSCF of HSS 108 inquiries, wherein will pass on specific sip message to described S-CSCF.

P-CSCF 106 can serve as the main communication center that is connected to local IMS subscriber.Like this, P-CSCF 106 can verify request, request is transferred to selected destination and the processing and the response of passing on.But but P-CSCF 106 can produce billable events and send the information relevant with billable events to CF 158.In addition, P-CSCF 106 can with PDF 154 interactions, permit, refuse or make the conversation request degradation thereby measure according to platform resource and service quality (QoS).

HSS 108 can comprise one or more servers of the central repository that is used for serving as user related information.HSS 108 can comprise and be used to handle Multimedia session and user-dependent subscription information.Some information that comprised in HSS 108 can comprise and are used to the specific user to identify the information of specific S-CSCF 102 positions.As noted before, when from network element reception inquiry, the position of specific S-CSCF 102 can be sent to I-CSCF 104.HSS 108 can also comprise subscriber profile information and be used to identify respective resources that described service is provided that () information for example, application, medium, service etc., described subscriber profile information comprises the service trigger point.Subscriber profile information can be transferred to S-CSCF 102 to be used for session control and service processing.In addition, HSS 108 can directly provide and receive renewal from application server 132.

SLF 110 can comprise one or more databases, and described database comprises subscriber's service position information.SLF 110 can receive the information that comprises the inquiry of subscriber identification information and return the HSS 108 that is used for this subscriber of identification service according to subscriber identification information from I-CSCF 104.

B. gateway and gateway control function

System 100 can comprise each assembly that is used for the IMS core bridges is received external network, such as PSTN (PSTN), the Internet etc.These assemblies can comprise MGW function 112, MGCF 114, SLG 116, NGW 118, BGCF 120 and BIGCF 122, can carry out that route is gone to or from the protocol conversion and the incident of IMS core.

MGW function 112 can connect PSTN network and IMS core.In one implementation, MGW function 112 can stop from the Bearer Channel of PSTN network and from the Media Stream of IMS core (for example, real-time transport protocol (rtp) stream in the IP network, or the AAL in the ATM backbone network 2 (AAL2)/ATM connects), the conversion of execution between these stop, and carry out decoding and signal Processing.In addition, MGW function 112 can provide tone and announcement to circuit switched (CS) user.In a kind of implementation according to the principle of the invention, MGW function 112 can be operated under the control of MGCF 114.

MGCF 114 can be the part of gateway infrastructure, and it makes it possible to communicate by letter between IMS core and PSTN network.MGCF 114 can be in conversion that session transfer is carried on an agreement between Integrated Service Digital Network(ISDN) (ISDN) User Part (ISUP) or basic rate interface (PRT) and Session Initiation Protocol before the IMS core.According to similar mode, the session that sensing PSTN user's IMS starts can be passed through MGCF 114.MGCF 114 can control the media channel among the MGW 112.In addition, MGCF 114 can be to CF 158 report account informations.

SLG 116 can comprise MGCF 114 and the one group of MGW that is associated 112 entity in identical physical entity.SLG 116 can be connected to the IMS core this locality exchange layer of PSTN.In one implementation, the interface between SLG 116 and local exchange network can comprise non-place based on DS0 or digital signal 1 (DS1) signaling (NFAS) PRI that is associated.

NGW 118 can comprise physically can be arranged in independently MGCF114 and the one group of MGW that is associated 112 entity of physical entity.NGW 118 can be connected to the IMS core the long distance layer of PSTN.In one implementation, can comprise based on signaling system 7 (SS7) interface of DS0 or DS1 and at the MGW 112 of NGW 118 and the interface between the long distance webs at the interface between the MGCF 114 of NGW 118 and the long distance webs and can comprise the DS1 Bearer Channel.

BGCF 120 can be connected to the calling that IMS starts circuit switched (CS) client (for example, the telephone number among the IMS customer call PSTN).BGCF 120 can select suitable network maybe can choose the suitable MGCF 114 of other network according to the route policy, will connect in described suitable network.

BIGCF 122 can be corresponding to inlet point, be used for (for example handling from wholesale dealer, PSTN gateway, NGW 118, SLG 116, I-SBC 150), wholesale gateway (can require the pre-payment mandate), other IP-based carrier wave to non-emergency call (for example, based on voice (VoIP) peering agreement via IP), the inside calling of emergency service peer etc.BIGCF 122 can from to non-IMS subscriber routing call.When call intent is the IMS subscriber maybe in the time will calling IMS and use, BIGCF 122 can route calls to the IMS core, perhaps (P-CSCF 106 when described call intent is non-IMS subscriber and calling party or callee can to walk around the IMS core element when not calling the IMS application, I-CSCF 104, S-CSCF 102, HSS108 etc.).BIGCF 122 can be being routed to BGCF 120 to the calling based on the end points of PSTN and the calling to IP-based end points (for example, wholesale end points, IP-based carrier wave etc.) being routed directly to the I-SBC 150 that is associated with described IP-based end points.BIGCF 122 can comprise the static routing policy that is used for urgent call is routed to BGCF 120.BIGCF 120 can also support to be used for non-emergency call is routed to from the origin of determining (for example, non-emergency call being required the wholesale gateway of pre-payment mandate) the static routing policy of prepaid services controller.If call from and/or go to the calling that IMS subscriber or IMS use (or service), BIGCF 122 can use I-CSCF 104 to route calls to the IMS core so, calls out and/or callee's feature to call.

BIGCF 122 can comprise a set of configuration data.For example, the tabulation that BIGCF 122 can the maintenance service main frame.If request unified resource designator (R-URI) territory in the incoming call request does not have one of identification service main frame, BIGCF 122 can come the address or the refusal calling of being resolved by domain name service (DNS) service (SRV) record entrusted on call outside ground by sending session initiation protocol (SIP) 403 responses (or message of other type) so, unless described calling is urgent call.In this manner, BIGCF 122 can refuse the calling that the destination is a unknown entity.

BIGCF 122 can also comprise by each national emergency prefix list.For example, BIGCF 122 can store the prefix 911 that is used for the U.S..BIGCF 122 can store the non-geographic number tabulation (for example, 800,411 etc.) of each origin country.Through tabulation thus, BIGCF 122 directly routing call draws to be used for PSTN.

BIGCF 122 can further store the tabulation (for example, gateway URL(uniform resource locator) (URL)) of originating hosts, may expect the calling from these main frames.If call out is not that BIGCF 122 can refuse request so from one of the main frame in the originating hosts tabulation (according to the highest inferior path or first path).Data based on originating hosts can comprise a plurality of data elements.For example, data element can comprise the gateway ip address of one or more host name.Originating hosts can point to prefix/postfix information so that make the caller number standardization.For example, wholesale gateway origin can have and is used for showing if provide 7 numerals so with+1732 rules of doing for caller number prefix in caller number.Suffix information can show to consider how many numerals after suffix.

Originating hosts can identifying call letters side's identity designator the position.For example, originating hosts which stem that can identify from the SIP INVITE is obtained caller information.

Data element can also comprise the country or the position of gateway.This position can be used for making the standardization of callee's number according to the calling country that starts by BIGCF 122.The position of gateway can also be used for identifying by BIGCF 122 will be to the position of the gateway of route urgent call wherein.

Data element may further include the obstruction prefix list from each originating hosts.For example, 1900 ^*Can show that " 1-900 " calls out is blocked by this gateway.Data element may further include the departures route that is used for each originating hosts.For example, can be routed to the main frame that is disposed from the non-emergency call of given main frame, such as the prepaid services controller.

Except that above data, BIGCF 122 can utilize following data to dispose: allow or refusal is handled the variable of INVITE, wherein ask URI not to be complementary with one of main frame of institute configuration service; Be used to accept or the option of each start territory or IP address of rejecting said request; Be used to handle the option of definite SIP request; The prefix of unallowed each origin; Static routing rule based on prefix matching; Point to the group of server on E.164 Number server farm; Sensing is used to be routed to the group of server of the I-CSCF server farm of IMS core; Sensing is used to the group of server of the BGCF server farm walking around the IMS core and be routed directly to BGCF 120; Point to the group of server on emergency service location-server farm (it can be U.S.'s emergency services network part); Be used to specify the option that definite message will be sent to error log or screen display; Be used for the option that makes gateway service and make gateway stop to serve at BIGCF 122; Be the needed country code of number standardization; Number normalisation rule (for example, based on originating gateway); Be used to enable or forbid writing down the option of classification; Be used to enable or forbid the option of alarm; And be used to the option enabling or forbid measuring.

In a kind of implementation according to the principle of the invention, BIGCF 122 can be connected to I-CSCF 104, SLG 116, NGW 118 and BGCF 120 via the SIP interface.In addition, BIGCF122 can be connected to ENUM 146 via the DNS Protocol interface.

C. media resource function (MRF)

The IMS core can provide shared multimedia service.The example of multimedia service (or use) comprise perform in a radio or TV programme announcement, V recording and broadcast, interactive voice response (IVR), facsimile reception and transmission, automatic speech recognition (ASR), Text To Speech (TTS) session, multimedia conferencing, customization ring back tone, via honeycomb press key calling (PoC), video messaging transmission etc.MRF 124 can be the part of IMS core and the service that can support to use media stream.

Illustrated among Fig. 1, MRF 124 can comprise MRFC 126, MRFP 128 and MRB 130.MRFC 126 and MRFP 128 are the IMS resources that provide support to the service relevant with carrying (for example, multi-party conversation, decipher to user's declaration, carrying etc.).MRFC 126 can provide the service relevant with carrying control.MRFP 128 can provide user's face resource, and described user's face resource can be by MRFC 126 requests and indication.MRB 130 can provide resource management function, and it can allow media resource to become the common source of sharing between a plurality of application.

D. application server

Application server (AS) 132 can be included in provide in the application layer of system 100 strengthen audio frequency, video, message sends and one or more servers of data, services.Application server 132 can provide the increment multimedia service by the user capture of IMS core and to those users.Application server 132 can be submitted expense to the IMS core of service, and described application server 132 provides described service to the IMS user community.

Two types the application server 132 that can use in system 100 can comprise little application and grand application (or grand application service).Can on shared service delivery platform, provide little application by using SCE logical one 34.Little application can comprise enhancing multimedia service miscellaneous, and described multimedia service needs the develop and field cycle fast.Grand application service can comprise that host's IP CENTREX (HIPC) 136, unified message send (UM) 138 and carrier wave application service 140.

HIPC 136 can be corresponding to the type of private branch exchange (Private Branch ExchangePBX) service, and wherein switching occurs in local telephone office rather than the traditional residing company of PBX place.In one implementation, can replace or additional HIPC 136 with SIP phonetic feature server.Unified message sends 138 and can allow the user to obtain concurrent sending voice message from individual interface, and Manifold technology is not (for example, phone, personal computer etc.) and can provide other unified message to send service (for example, the fax deposit is obtained, voice to Email etc.).Carrier wave AS 140 can facility exempt from the instrument call treatment.

E. service creation environment (SCE)

SCE logical one 34 can be provided for the basis of exploitation service of future generation rapidly.SCE 134 can support Java specification request (JSR) 116 SIP servlets and external application programming interface (API) external member can visit the IMS core for the developer.Single SCE 134 can support a plurality of grand application servers and can support to make up little application.

F. service

The IMS core can be supported a plurality of different services, such as GLMS 142, existence 144 and E.164 Number server 146.GLMS 142 can comprise that a plurality of application that allow to stride in the IMS core carry out one or more services of group list creation, management and use.GLMS 142 can force visit and visibility rules.Existence 144 can comprise one or more services, and described service is used to make the task automation of having gathered existence and availability information.Existence 144 can be to the state of another user's of user notification availability and wish so that communicate.Existent service device 144 can use existence user agent (Presence User Agent PUA) to come managing I MS subscriber's existence and handle the existence reservation request.For example, application or IMS subscriber can serve as the observer, and it is the entity that the existence information that is provided by existent service device 144 is provided.E.164 Number server 146 can provide the conversion of E.164 arriving SIP URI.BIGCF 122 and S-CSCF 102 can inquire about E.164 Number server 146 so that next hop of determining to call out.In some implementations according to the principle of the invention, BIGCF 122 can carry out and be used to call out the ENUM inquiry of resolving with called number.

G. boundary element

The IMS core can comprise one or more Session Border Controllers (SBC), be used to provide control to border between different service provider networks, be provided at based on the IMS core of SIP and the signaling protocol interworking between other service provider network, be controlled at the transmission border between the service provider network, and provide use measurement and service quality (QoS) to measure Media Stream.Two types the SBC that can be associated with the IMS core is access session boarder controller (A-SBC) 148 and I-SBC 150.

A-SBC 148 can correspond to the inlet point of the IMS core that is used for customer site equipment (CPE) portfolio.The firewall capabilities that A-SBC 148 can provide SIP to know is used for network enabled address translation (NAT), prevents that denial of service (DoS) from attacking and carrying out other security and implementing feature.A-SBC 148 can be the first sip event standard point before the IMS core.In one implementation, A-SBC 148 can utilize Border Gateway Function to replace or replenish.

The Session Border Controller (I-SBC) 150 that interconnects between net can serve as between IMS core and the wholesale gateway and the tie point between described IMS core and IP equity VoIP carrier wave.I-SBC 150 can provide SIP standardization and topology hiding and interconnection network gateway (THIG) service.In one implementation, I-SBC 150 can utilize Border Gateway Function (BGF) to replace or replenish.

H. policy

System 100 can comprise a plurality of policy assemblies.For example, can comprise policy engine 152, PDF 154 and RM 156 as system 100 illustrated among Fig. 1.Policy engine 152 can comprise one or more rule-based engines, is used to manage the subscriber to the visit of IMS core, the subscriber visit to resource, and for the routing decision that in the IMS core, carries out several dissimilar event request.In one implementation, policy engine 152 can provide decision logic to judgement in the IMS core and policy point.PDF 154 can be corresponding to the policy decision-point (PDP) that is used for based on the local policy control of service.PDF 154 can carry out the policy judgement according to session and medium relevant information.PDF 154 can exchange this determination information with another IMS element (such as A-SBC 148 or I-SBC 150) so that the flow and the characteristic of control communication link.Can use RM 156 to come the policy of executive module level.Illustrated among Fig. 1, RM (resource management) 156 can be associated with for example S-CSCF 102, BIGCF 122, A-SBC 148 and I-SBC 150.In one implementation, RM 156 judgement of can storing and pursue a policy, described policy judges that the position that is associated with RM 156 is relevant.

I. the function of charging (CF)

CF 158 can comprise the integrated system that is used to influence off-line charge and online charging.Off-line charge is wherein to use the process of collecting the pay imformation that is used for the Internet resources use concomitantly with this resource.Can transmit pay imformation via a succession of CF 158.At this procedure epilogue, call detail record (CDR) file can be produced by network, and its record keeping territory that is transferred to Virtual network operator then is with the subscriber who is used for comprising rate and the payment processing of keeping accounts.

Online charging is that wherein the process of the service that provides can be provided pay imformation in real time.Support this ability can be included in the direct reciprocation between the session control mechanism of charging mechanism and network.The example of online charging comprises the use of prepaid call card.

But CDF 160 can be the billable events establishment of gathering from the IMS assembly that single CDR is to be used for off-line record keeping activity.CDF 160 can be from charging triggering function (CTF) but is gathered billable events, and described charging triggering function (CTF) can be associated with the assembly of system 100 and after creating CDR account data is delivered to CGF 162.

CGF 162 can serve as the gateway between off-line charge system, on-line system and outside after-treatment system (such as the record keeping territory).

J. generic user profile (GUP)

The information relevant with the IMS subscriber can adopt many forms, is managed by many network elements and management organization.This makes user, network element and value-added service provider become complicated more to the visit of these data.Generic user profile (GUP) 164 head it offs provide the generic concept of subscriber data to describe.The GUP server can be provided for visiting the device of data described in GUP 164.

The exemplary configuration of BIGCF

Fig. 2 illustrates the exemplary configuration of BIGCF 122.As illustrated, BIGCF 122 can comprise bus 210, processing logic 220, storer 230, input equipment 240, output device 250 and communication interface 260.Should be appreciated that BIGCF 122 can comprise other assembly (not shown) that helps reception, transmission and/or deal with data.Should be appreciated that in addition other configuration also is fine.

Bus 210 can allow the communication between components at BIGCF 122.Processing logic 220 can comprise the processor or the microprocessor of any kind that is used to explain and executes instruction.In other implementation, processing logic 220 may be implemented as or comprises special IC (ASIC), field programmable gate array (FPGA) etc.Storer 230 can comprise the random-access memory (ram) or other type dynamic storage that are used to store the information carried out for processing logic 220 and instruction, be used to store the static information and the ROM (read-only memory) (ROM) of instruction or the static storage device of other type that are used for processing logic 220, and/or is used for other type magnetic or the optical recording media and the corresponding drivers thereof of canned data and/or instruction.

Input equipment 240 can comprise and is used to allow the equipment of operator to BIGCF 122 input informations, such as keyboard, keypad, mouse, pen, microphone, one or more biometric mechanisms etc.Output device 250 can comprise the equipment that is used for to operator's output information, such as display, loudspeaker etc.

Communication interface 260 can comprise any transceiver formula mechanism, be used to make BIGCF 122 can with miscellaneous equipment and/or system communication.For example, communication interface 260 can comprise be used for system 100 in the mechanism of other component communication.

As following detailed description, BIGCF 122 can carry out the processing of going to route and being associated from each non-IMS subscriber's calling.BIGCF 122 can carry out the software instruction that is comprised in response to processing logic 220 and carry out these and other function in the computer-readable medium such as storer 230.Computer-readable medium can be defined as one or more memory devices and/or carrier wave.Software instruction can read storer 230 from another computer-readable medium or another equipment via communication interface 260.The software instruction that comprises in storer 230 can make processing logic 220 carry out after a while with the process of describing.As selection, can replace or use hard-wired circuit so that realize process according to the principle of the invention in conjunction with software instruction.Thereby, be not limited to any concrete combination of hardware circuit and software according to the system and method for the principle of the invention.

Exemplary process

Fig. 3 is the process flow diagram that is used for the example process of routing call.Processing described in Fig. 3 can be realized by BIGCF 122.Processing can start from BIGCF 122 receipt of call requests (action 310).BIGCF 122 can be from for example class 3 (PSTN long distance) network, class 5 (the local exchange of PSTN) network, wholesale subscriber, prepaid application controller or from other IP carrier wave receipt of call request.

BIGCF 122 can determine whether described calling relates to IMS core (action 320).Determine that in order to carry out this BIGCF 122 can send inquiry to determine that whether caller number is by the IMS kernel service to E.164 Number server 146.For example, if caller number is associated with being used to call the IMS profile that IMS uses, BIGCF 122 can determine that described calling relates to the IMS core so.BIGCF 122 can send inquiry to determine that whether callee's number is by the IMS kernel service to E.164 Number server 146.For example, if callee's number and IMS subscriber or be associated with being used to call the IMS profile that IMS uses, BIGCF 122 can determine that described calling relates to the IMS core so.On the other hand, IMS uses or purpose does not lie in the IMS subscriber if calling does not relate to, and BIGCF 122 can determine that described calling does not relate to the IMS core so.

If BIGCF 122 determines that this calling relates to the IMS core, BIGCF 122 can be routed to the IMS core to call request to carry out initial and/or to stop IMS service (action 330) so.BIGCF 122 for example can handle the I-CSCF 104 that call request is transferred to the IMS core to be transferred to suitable S-CSCF 102.S-CSCF 102 can call suitable IMS service and/or pass on call request to suitable IMS subscriber.

If BIGCF 122 determines that this calling does not relate to the IMS core on the other hand, BIGCF 122 can walk around the IMS core to this call request of route of appropriate purpose ground (action 340) so.BIGCF 122 for example can be transferred to BGCF 120 to call request, thereby is routed to suitable substance P STN destination node or is transferred to suitable I-SBC 150 to be routed to wholesale or IP-based carrier wave end points.

Fig. 4 A-4C is the process flow diagram that is used for the example process of routing call.Processing described in Fig. 4 A-4C can be carried out by BIGCF 122.Processing can start from BIGCF 122 and determine whether the call request that is received is associated with the territory of being served (action 402).Determine in order to carry out this, BIGCF 122 can be in the domain list of being served by the IMS core territory part of search request URI.If described territory is not in tabulation, BIGCF 122 can be routed to the address (action 404,406,408) of being resolved by DNS-SRV to call outside so, unless determine that described calling is urgent call.BIGCF 122 can come under the situation that not have coupling described calling of refusal rather than route (moving 404,410,412) externally by the response that sends SIP 403 responses or another type.

If call request is associated with the territory of being served, BIGCF 122 can determine whether originating hosts is known (action 414) so.For example, BIGCF 122 can compare originating hosts with the originating hosts tabulation.If the main frame during originating hosts is not tabulated with originating hosts is complementary, BIGCF 122 can refuse this calling (action 410,412) by the response that sends SIP 403 responses or another type so.

If the User Part that BIGCF 122 can analysis request URI and it are numeric strings, BIGCF 122 can search this numeric string in the emergency number tabulation of country so, this tabulation be associated with originating hosts (action 414 with move 416, Fig. 4 B).BIGCF 122 can walk around the IMS core urgent call is routed to BGCF 120 (action 416).When determining to call out for urgent call, BIGCF 122 can insert the urgent call designator.

For non-emergency call, BIGCF 122 can use static routing rule (action 418) according to originating hosts.For example, no matter prefix, BIGCF 122 can be routed to the address that is disposed from given main frame calling out.For example, BIGCF 122 can be calling out from determining that gateway is routed to the service controller of pre-payment (action 420).BIGCF 122 can also block from the calling of determining the origin.For example, BIGCF 122 can block the non-emergency call from the emergency service peer.

In one implementation, BIGCF 122 called number that can support 122 of BIGCF wherein and prefix in the prefix list to be complementary is routed directly to the route policy (action 418) of BGCF 120.This prefix tabulation (for example, non-geographical number) can be at particular country, and can dispose by each originating hosts.As an example, if IMS does not provide the freephone service that is associated, BIGCF 122 can call out " 1-800 " and be routed directly to BGCF 120 so.

After using the static routing rule (action 418) according to prefix, origin or both combinations, BIGCF 122 can be according to using call notification Screening Treatment (action 422, Fig. 4 C) to the originators territory or with the rule that the IP address of dialed digit (called party identity) coupling is disposed.As an example, if be configured to get clogged according to each prefix that the territory identified that starts, rule can make any calling of BIGCF 122 refusals so.

When not via the static rule routing call, BIGCF 122 can carry out caller number (CgPN) standardization (action 424, Fig. 4 B) according to the entity of the described calling of starting.In this case, can come the configuration standard rule corresponding to originating gateway.In some cases, standardization may not can produce E.164 form (for example, if calling party identity be can not concrete rule standardized or each originating gateway be disabled).

BIGCF 122 can make callee's number (CdPN) standardization (for example, increase or remove numeral, increase "+" etc.) (action 424) according to being used for rule from the country code of caller number and dialed digit.For example, if calling party is in the U.S. and caller number has 10 numerals, can increase prefix "+1 " so.In some cases, if called party identity is can not be standardized, can not realize E.164 form so.

If BIGCF 122 successfully makes callee's number standardization (action 424), BIGCF 122 can put into the standardization number among the request URI and resolve and can preserve the numeral of initial dialing so that may use for BGCF 120 at last for ENUM 146 so.In a kind of implementation according to the principle of the invention, BIGCF 122 can be saved in the numeral from the receive initial dialing of asking URI in historical information (History-Info) stem of request.

If calling party and/or callee's number are not forms E.164, BIGCF 122 route (for example, to I-CSCF 104, BGCF 120 or I-SBC 150 route) (action 426) of can selecting to breathe out.Table 1 provides can be by the possible Route Selection of BIGCF 122 execution.

Calling party	The callee	Action
			E.164	E.164	Come route (action 428) according to the URI that is obtained through infrastructure ENUM inquiry
E.164	Can not be standardized as E.164	1., utilize route header:＜sip:icscf address if the caller lookup in the infrastructure ENUM inquiry causes SIP URI to point to I-CSCF 104 (that is, the IMS core); Mode=orig; Lr〉route to I-CSCF 104, to show according to the origin to S-CSCF 102 routes to I-CSCF 104.2. to I-CSCF 104 routes.R-URI: callee (not changing) route header: do not have (only be used to stop serving route) History-Info: do not have (because of R-URI does not change) P-Asserted-Identity: calling party (E.164) is if 3. the callee is associated with non-geographical prefix, described non-geographical prefix is complementary with prefix in calling out the prefix list that originating point is associated, as mentioned above, BIGCF 122 can route calls to BGCF 120, R-URI does not change, and does not require route and History-Info.
			E.164	Title (alphanumeric character in the User Part of R-URI)	1. be routed to I-CSCF 104.R-URI: callee (not changing) route header: do not have (only be used to stop serving route) History-Info: do not have (because of R-URI does not change) P-Asserted-Identity: calling party (E.164)

E.164 non-	E.164	Using the TLD that infrastructure ENUM 146 is disposed only to carry out ENUM as the callee searches.If the responds SIP URI from ENUM points to: 1.I-CSCF 104: be routed to the IMS core, R-URI: from the SIP URI of ENUM, History-Info: the numeral of original dialing, there are not route header 2. wholesale/VoIP equities: be routed to the I-SBC 150 (further describing) that is associated as following, R-URI: from the SIP URI of ENUM, and route header is pointed to I-SBC (as single exhalation route).Do not require History-Info.3.NXDOMAIN:E.164 search and do not have return results.Use is carried out user ENUM inquiry (action 430, Fig. 4 C) by the territory that originating address disposed.If any SIP URI that exists inquiry thus to be returned, the then address of being returned in host's part that BIGCF 122 can be routed directly to calling at SIP URI.Under the situation that is not having response, BIGCF 122 can use top e164.arpa territory to carry out one or more ENUM inquiry, and routes calls among the SIP URI from the address that ENUM returned.If do not return response, then: draw for possible PSTN, route to BGCF 120, utilize the R-URI:E.164 number, History-Info: the numeral of original dialing (if E.164 callee's number is standardized as).4.VOID: callee's number stops service, and refusal is called out.
			E.164 non-	E.164 non-	Termination feature invocation for possible routes calls to I-CSCF 104
E.164 non-	Title (alpha-numeric string)	Termination feature invocation for possible routes calls to I-CSCF 104

Table 1: the BIGCF route that is used for non-E.164 calling/called party identity

Suppose the call request that BIGCF 122 receives from SLG 116, NGW 118 or I-SBC 150.If callee and caller number are forms E.164, then BIGCF 122 can produce two dns naming authority pointers (NAPTR) inquiry (action 424,428, Fig. 4 B) to ENUM 146.Table 2 provides inquiry and to the exemplary lists that may respond of these inquiries.BIGCF 122 can safeguard the routing table that is used to identify I-SBC 150, wherein will partly come according to the host of the SIP URI that is returned from ENUM 146 to pass on calling to I-SBC 150.Host's part can identify wholesale or the reciprocity gateway of VoIP.Under the situation that the IMS core stops, the ENUM response of being returned can identify and will pass on the I-CSCF 104 that calls out to it.

Table 2:ENUM inquiry

BIGCF 122 can use the above-mentioned response from two NAPTR inquiries to route calls to IMS core (for example, to I-CSCF 104) or walk around described IMS core (I-SBC 150).Below table 3 how to have described according to received from E.164 Number server 146 to the response of above two inquiries in BIGCF 122 routing calls.

If there is no be used for the record of NAPTR inquiry, BIGCF 122 can inquiring user ENUM so.If there is the SIP URI that is returned by this inquiry, BIGCF 122 can be routed directly to calling the pointed address of host's part of SIP URI so.If this does not return effective URI, then BIGCF 122 can route calls to BGCF 120 (action 438).

Calling party ENUM response	Callee ENUM response	Action
			N/a	VOID	Refusal is called out.Called-number stops service.
Wholesale or the reciprocity gateway URI of VoIP of NXDOMAIN OR VOID OR	SIP URI type: I-CSCF	Be routed to I-CSCF 104.R-URI: from the SIP URI of the ENUM 146 that is used for the callee.Route header: do not have.History-Info stem: original R-URI (in the ENUM inquiry, using)
			Wholesale or the reciprocity gateway URI of VoIP of NXDOMAIN OR VOID OR	SIP URI type: the reciprocity gateway of wholesale or VoIP	Be routed to I-SBC 150.R-URI: from the SIP URI of the ENUM 146 that is used for the callee.Route header:＜I-SBC address; Lr〉History-Info: original R-URI (in the ENUM inquiry, using)

Wholesale or the reciprocity gateway URI of VoIP of NXDOMAIN OR VOID OR	NXDOMA IN	Carry out user ENUM inquiry.If the SIP URI that existence is returned by this inquiry, the then address of returning in host's part that BIGCF 122 can route calls at SIP URI.If this does not return response, then: if not from SLG 116 then be routed to BGCF 120.All stems do not change.PSTN interrupts.
			SIP URI type: I-CSCF	NXDOMAIN OR SIP URI (any kind)	Be routed to I-CSCF 104.R-URI: from the SIP URI of callee's ENUM 146, if be NXDOMAIN perhaps then do not change route header:＜sip:icscf address from the response of ENUM; Mode=orig; Lr〉wherein return the icscf address from the ENUM inquiry of calling party.History-Info: do not have, if perhaps change RURI then be original dialed digit.P-Asserted-Identity: from the SIP URI that ENUM returned of calling party.
SIP URI type: wholesale	NXDOMAIN	Carry out user ENUM inquiry.If return SIP URI by this inquiry, the address of returning in host's part that BIGCF 122 can be routed directly to calling at SIP URI then.If do not return any response, then: be routed to BGCF 120.R-URI: do not have change.Route: do not have History-Info: do not have.P-Asserted-Identity: from the SIP URI that ENUM returned of calling party

Table 3: the ENUM inquiry response that influences route at BIGCF

In case BIGCF 122 finds that route will be used to call out, BIGCF 122 can carry out the way of escape by selecting screening (screening) (action 422, Fig. 4 C) whether to allow selected route to check so.BIGCF 122 can be according to the I-CSCF104 of above-mentioned inquiry in the IMS core, to BGCF 120 or to I-SBC 150 routing calls that are used for IP-based destination node (action 432, Fig. 4 B; Action 434,436,438, Fig. 4 C).

Example

Following example illustrates top with respect to Fig. 3 and the described processing of 4A-4C.Fig. 5 illustrates the exemplary process that is used for calling is routed to from wholesale subscriber the PSTN destination node.In this example, suppose that calling party (that is wholesale subscriber) and callee's (that is PSTN destination node) do not call the application based on IMS.

Illustrated among Fig. 5, can receive described calling from wholesale subscriber at wholesale service supplier (SP) gateway (GW), wherein said wholesale subscriber is associated with described wholesale service provider gateway.Wholesale service provider gateway can be the I-SBC 150 of Call Forwarding to system 100.

Processing can start from BIGCF 122 from I-SBC 150 receipt of call (action 510).In response to receipt of call, BIGCF 122 can inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether calling party is by IMS kernel service (action 520) according to caller number.If calling party is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If calling party be can't help the IMS kernel service on the other hand, the response from E.164 Number server 146 can comprise NXDOMAIN (be used for showing and do not find record at E.164 Number server 146) or similar response code so.BIGCF 122 can also inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether the callee is by IMS kernel service (action 520) according to callee's number.If the callee is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If the callee can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.

In this example, BIGCF 122 can determine that calling will be directed to the PSTN destination node and will can not call any IMS application.BIGCF 122 can route calls to BGCF 120 (action 530).BGCF 120 can identify the PSTN outlet gateway that is used to call out and described calling is routed to the PSTN that is identified and export gateway (action 540).PSTN outlet gateway can route the call to suitable substance P STN destination node then.Therefore in this example, BIGCF 122 can make to call out and walk around the IMS core.

Fig. 6 illustrates and is used for route is pointed to wholesale subscriber's calling from the PSTN originating point exemplary process.In this example, suppose that calling party (that is PSTN originating point) and callee (that is wholesale subscriber) do not call the application based on IMS.

Illustrated among Fig. 6, can be at PSTN gateway (GW) from the calling party receipt of call.The PSTN gateway can be Call Forwarding to BIGCF 122.

Processing can start from BIGCF 122 from PSTN gateway receipt of call (action 610).In response to receipt of call, BIGCF 122 can inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether calling party is by IMS kernel service (action 620) according to caller number.If calling party is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If calling party be can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.BIGCF 122 can also inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether the callee is by IMS kernel service (action 620) according to callee's number.If the callee is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If the callee can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.

In this example, BIGCF 122 can determine that calling will be directed to wholesale service provider gateway and will can not call any IMS application.BIGCF 122 can determine (for example, I-SBC150), and to route calls to wholesale service provider gateway (action 630) via this I-SBC 150 with the exit point that visits the wholesale service provider gateway that is identified in ENUM response.Wholesale then service provider gateway can route calls to suitable wholesale subscriber.Therefore in this example, BIGCF 122 can make to call out and walk around the IMS core.

Fig. 7 illustrates and is used for route is pointed to the calling of PSTN destination node from the PSTN originating point exemplary process.In this example, suppose that calling party (that is PSTN originating point) and callee's (that is PSTN destination node) do not call the application based on IMS.

Illustrated among Fig. 7, can be at the PSTN gateway from the calling party receipt of call.The PSTN gateway can be Call Forwarding to BIGCF 122.

Processing can start from BIGCF 122 from PSTN gateway receipt of call (action 710).In response to receipt of call, BIGCF 122 can inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether calling party is by IMS kernel service (action 720) according to caller number.If calling party is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If calling party be can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.BIGCF 122 can also inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether the callee is by IMS kernel service (action 720) according to callee's number.If the callee is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If the callee can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.

In this example, BIGCF 122 can determine that calling will be directed to the PSTN destination node and will can not call any IMS application.BIGCF 122 can route calls to BGCF 120 (action 730).BGCF 120 can identify the PSTN outlet gateway (can be gateway identical with the gateway of receipt of call or different PSTN gateways) that is used to call out and route calls to the PSTN outlet gateway (action 740) that is identified.PSTN outlet gateway can route calls to suitable substance P STN destination node then.Therefore in this example, BIGCF 122 can make to call out and walk around the IMS core.

Fig. 8 illustrates and is used for route is pointed to IMS user's calling from the PSTN originating point exemplary process.Illustrated among Fig. 8, can be at the PSTN gateway from calling party (that is PSTN originating point) receipt of call.The PSTN gateway can be Call Forwarding to BIGCF 122.

Processing can start from BIGCF 122 from PSTN gateway receipt of call (action 810).In response to receipt of call, BIGCF 122 can inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether calling party is by IMS kernel service (action 820) according to caller number.If calling party is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If calling party be can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.BIGCF 122 can also inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether the callee is by IMS kernel service (action 820) according to callee's number.If the callee is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If the callee can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.

In this example, BIGCF 122 can determine that the callee is by the IMS kernel service.Thereby, can comprise the information of the I-CSCF 104 that is used to route calls to the IMS core from the response of E.164 Number server 146.BIGCF 122 can route calls to I-CSCF 104 (action 830).I-CSCF 104 can route calls to suitable S-CSCF 102, and described S-CSCF 102 can obtain the information relevant with the callee (for example, from HSS 108 profile (not shown)).S-CSCF 102 can be Call Forwarding to IMS user A-SBC 148 associated therewith (action 840).Therefore in this example, BIGCF 122 can come route to call out by the IMS core.

Fig. 9 illustrates the exemplary process that is used for calling is routed to from wholesale subscriber the IMS subscriber.Illustrated among Fig. 9, can be at wholesale service supplier (SP) gateway (GW) from wholesale subscriber's receipt of call.Wholesale service provider gateway can be the I-SBC150 of Call Forwarding to system 100.

Processing can start from BIGCF 122 from I-SBC 150 receipt of call (action 910).In response to receipt of call, BIGCF 122 can inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether calling party is by IMS kernel service (action 920) according to caller number.If calling party is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If calling party be can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.BIGCF 122 can also inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether the callee is by IMS kernel service (action 920) according to callee's number.If the callee is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If the callee can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.

In this example, BIGCF 122 can determine that the callee is by the IMS kernel service.Thereby, can comprise the information of the I-CSCF 104 that is used to route calls to the IMS core from the response of E.164 Number server 146.BIGCF 122 can route calls to I-CSCF 104 (action 930).I-CSCF 104 can route calls to suitable S-CSCF 102, and described S-CSCF 102 can obtain the information relevant with the callee (for example, from HSS 108 profile (not shown)).S-CSCF 102 can be Call Forwarding to IMS user A-SBC 148 associated therewith (action 940).Therefore in this example, BIGCF 122 can come route to call out by the IMS core.

Figure 10 illustrates the exemplary process that is used for calling is routed to from wholesale subscriber the PSTN destination node according to another implementation of the principle of the invention.In this example, suppose that calling party (that is wholesale subscriber) and/or callee's (that is PSTN destination node) call the application based on IMS.

Illustrated among Figure 10, can be at wholesale service supplier (SP) gateway (GW) from wholesale subscriber's receipt of call.Wholesale service provider gateway can be the I-SBC 150 of Call Forwarding to system 100.

Processing can start from BIGCF 122 from I-SBC 150 receipt of call (action 1010).In response to receipt of call, BIGCF 122 can inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether calling party is by IMS kernel service (action 1020) according to caller number.If calling party is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If calling party be can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.BIGCF 122 can also inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether the callee is by IMS kernel service (action 1020) according to callee's number.If the callee is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If the callee can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.

In this example, BIGCF 122 can determine that calling will be directed to the IMS core.Thereby, can comprise the information of the I-CSCF 104 that is used to route calls to the IMS core from the response of E.164 Number server 146.BIGCF 122 can route calls to I-CSCF 104 (action 1030).I-CSCF 104 can route calls to S-CSCF 102, and it can carry out necessary application call.Be directed to the PSTN destination node owing to call out, S-CSCF 102 can inquire about E.164 Number server 146 callee's number is mapped to SIP URI (action 1040).S-CSCF 102 can utilize SIP URI to route calls to BGCF 120 (action 1050).

BGCF 120 can identify the PSTN outlet gateway that is used to call out and described calling is routed to the PSTN that is identified and export gateway (action 1060).PSTN outlet gateway can route calls to suitable substance P STN destination node then.Therefore in this example, BIGCF 122 can use to call the one or more IMS that are used for described calling by the routing call of IMS core.

Figure 11 illustrate be used for route from the PSTN origin exemplary process to wholesale subscriber's calling.In this example, suppose that calling party and/or callee call the application based on IMS.

Illustrated among Figure 11, can be at PSTN gateway (GW) from the calling party receipt of call.The PSTN gateway can be Call Forwarding to BIGCF 122.

Processing can start from BIGCF 122 from PSTN gateway receipt of call (action 1110).In response to receipt of call, BIGCF 122 can inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether calling party is by IMS kernel service (action 1120) according to caller number.If calling party is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If calling party be can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.BIGCF 122 can also inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether the callee is by IMS kernel service (action 1120) according to callee's number.If the callee is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If the callee can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.

In this example, BIGCF 122 can determine that calling will be directed to the IMS core.Thereby, can comprise the information of the I-CSCF 104 that is used to route calls to the IMS core from the response of E.164 Number server 146.BIGCF 122 can route calls to I-CSCF 104 (action 1130).I-CSCF 104 can route calls to S-CSCF 102, and it can carry out necessary application call.Be directed to wholesale subscriber owing to call out, S-CSCF 102 can inquire about E.164 Number server 146 callee's number is mapped to SIP URI (action 1140).S-CSCF102 can utilize SIP URI to route calls to wholesale gateway (action 1150) via the I-SBC 150 that is associated with this gateway.In another implementation, if use for the callee calls IMS, S-CSCF 102 can use static registration to route calls to wholesale subscriber so.

Wholesale then service provider gateway can route calls to suitable wholesale subscriber.Therefore in this example, BIGCF 122 can pass through the routing call of IMS core, uses to call the one or more IMS that are used for described calling.

Figure 12 illustrates and is used for route is pointed to the calling of PSTN destination node from the PSTN originating point exemplary process.In this example, suppose that calling party (that is PSTN originating point) and/or callee's (that is PSTN destination node) call the application based on IMS.

Illustrated among Figure 12, can be at PSTN gateway (GW) from the calling party receipt of call.The PSTN gateway can be Call Forwarding to BIGCF 122.

Processing can start from BIGCF 122 from PSTN gateway receipt of call (NGW or SLG).In response to receipt of call, BIGCF 122 can inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether calling party is by IMS kernel service (action 1220) according to caller number.If calling party is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If calling party be can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.BIGCF 122 can also inquire about E.164 Number server 146 (for example, using NAPTR DNS inquiry) to determine that whether the callee is by IMS kernel service (action 1220) according to callee's number.If the callee is by the IMS kernel service, can comprise the information of the I-CSCF 104 that is used to identify the IMS core so from the response of E.164 Number server 146.If the callee can't help the IMS kernel service on the other hand, can comprise NXDOMAIN or similar response code from the response of E.164 Number server 146 so.

In this example, BIGCF 122 can determine that calling will be directed to the IMS core.Thereby, can comprise the information of the I-CSCF 104 that is used to route calls to the IMS core from the response of E.164 Number server 146.BIGCF 122 can route calls to I-CSCF 104 (action 1230).I-CSCF 104 can route calls to S-CSCF 102, and it can carry out necessary application call.Be directed to the PSTN destination node owing to call out, S-CSCF 102 can inquire about E.164 Number server 146 callee's number is mapped to SIP URI (action 1240).S-CSCF 102 can utilize this SIP URI to route calls to BGCF 120 (action 1250).

BGCF 120 can identify the PSTN outlet gateway that is used to call out (can be and receive described calling and it is transferred to the identical gateway of the gateway of BIGCF 122 or different PSTN gateways) and route calls to the PSTN outlet gateway (action 1260) that is identified.PSTN outlet gateway can route calls to suitable substance P STN destination node then.Therefore in this example, BIGCF 122 can pass through the routing call of IMS core, uses to call the one or more IMS that are used for described calling.

Conclusion

Implementation as described herein provides the introducing gateway control function that is used for coming by the IMS core when needed the route calling.Relate to the IMS subscriber or call the IMS application if call out, introduce gateway control function so and can pass through the described calling of IMS core route.Do not relate to the IMS subscriber or call the IMS application if call out on the other hand, introduce gateway control function so and can walk around the IMS core.

The description of above-mentioned exemplary implementation provides diagram and explanation, but and does not mean that exhaustive the present invention or it is restricted to disclosed precise forms.Can make amendment and change according to above instruction, and can obtain enlightenment by implementing the present invention.For example, above-mentioned calling routing condition only is used for explanatory purpose.Relying on other calling routing condition of introducing gateway control function also is fine.For example, can relate to the introducing gateway control function from wholesale subscriber/VoIP equity subscriber to the reciprocity subscriber's of wholesale subscriber/VoIP calling route.

Though described a series of actions, but in according to other implementation of the present invention, can change the order of described action with respect to Fig. 3-12.In addition, can the incoherent action of Parallel Implementation.

For those of ordinary skills, realize that with software, firmware and the many multi-form of hardware in the implementation illustrated in the accompanying drawings each side of the present invention is conspicuous.Be used to realize do not limit the present invention according to the actual software code or the special control hardware of the each side of the principle of the invention.Thereby, do not consider that concrete software code described the operation and the behavior of each side of the present invention---should be appreciated that those of ordinary skills will be able to come design software and control hardware so that realize described each side according to the description here.

In addition, some part of the present invention may be implemented as " logic " that is used to carry out one or more functions.This logic can comprise the combination of hardware, software or hardware and software such as special IC, field programmable gate array, processor or microprocessor.

Implementation according to the principle of the invention is applicable to the Multimedia session of being realized via Internet protocol infrastructure usually, and E.164 described Internet protocol infrastructure use that number identifies end points.The historical context of the term of the frequent use that is associated with telephoning telephony (for example, " calling ") and E.164 number and this service does not all limit the scope of the invention or applicability.

Employed element, action or instruction are not appreciated that it is crucial or necessary for purposes of the invention in present specification, unless explicitly is described like this.The item that does not add the quantity modification is intended to comprise one or more.Only representing under one the situation, using term " " or similar language.In addition, phrase " according to " be intended to mean " basis at least in part ", unless explicitly explanation in addition.

Claims

1. method that is used for the network route comprises:

From the calling of first party reception to second party;

In response to receiving described calling, determine that whether described first party is by internet protocol multimedia subsystem IMS kernel service;

In response to receiving described calling, determine that whether described second party is by internet protocol multimedia subsystem IMS kernel service;

When described first party or described second party during, described calling is routed to described IMS core by described IMS kernel service; And

When described first party and described second party be can't help described IMS kernel service, to the described calling of described second party route and walk around described IMS core.

2. the method for claim 1, wherein

Determine whether described first party is comprised by internet protocol multimedia subsystem IMS kernel service: use the information relevant to come Query Database with described first party, and

Determine whether described second party is comprised by internet protocol multimedia subsystem IMS kernel service: use the information relevant to inquire about described database with described second party.

3. the method for claim 1, wherein

Determine whether described first party is comprised by internet protocol multimedia subsystem IMS kernel service: use the information relevant to send first domain name service query to database with described first party, and

Determine whether described second party is comprised by internet protocol multimedia subsystem IMS kernel service: use the information relevant to send second domain name service query to described database with described second party.

4. the method for claim 1, wherein

Determine whether described first party is comprised by internet protocol multimedia subsystem IMS kernel service: determine whether described first party is called IMS and used.

5. method as claimed in claim 4, wherein

Determine whether described second party is comprised by internet protocol multimedia subsystem IMS kernel service: determine whether described second party calls the IMS application or described second party is the IMS subscriber.

6. system that is used for the network route comprises:

Be used for from the device of first party reception the calling of second party;

Be used for determining that in response to receiving described calling described first party is whether by the device of internet protocol multimedia subsystem IMS kernel service;

Be used for determining that in response to receiving described calling described second party is whether by the device of internet protocol multimedia subsystem IMS kernel service;

Be used for described calling being routed to during by described IMS kernel service the device of described IMS core when described first party or described second party; And

Be used for when described first party and described second party be can't help described IMS kernel service to the described calling of described second party route and walk around the device of described IMS core.

7. system as claimed in claim 6, wherein

Be used for determining that in response to receiving described calling whether described first party is comprised by the device of internet protocol multimedia subsystem IMS kernel service: use the information relevant to come the device of Query Database with described first party, and

Be used for determining that in response to receiving described calling whether described second party is comprised by the device of internet protocol multimedia subsystem IMS kernel service: use the information relevant to inquire about the device of described database with described second party.

8. system as claimed in claim 6, wherein

Be used for determining that in response to receiving described calling whether described first party is comprised by the device of internet protocol multimedia subsystem IMS kernel service: use the information relevant to send the device of first domain name service query to database with described first party, and

Be used for determining that in response to receiving described calling whether described second party is comprised by the device of internet protocol multimedia subsystem IMS kernel service: use the information relevant to send the device of second domain name service query to described database with described second party.

9. system as claimed in claim 6, wherein

Be used for determining that in response to receiving described calling whether described first party is comprised by the device of internet protocol multimedia subsystem IMS kernel service: determine whether described first party calls the device that IMS uses.

10. system as claimed in claim 9, wherein

Be used for determining that in response to receiving described calling whether described second party is comprised by the device of internet protocol multimedia subsystem IMS kernel service: determine whether described second party calls that IMS uses or described second party is IMS subscriber's a device.