CN101068279B - Emergency call return call realizing method - Google Patents
Emergency call return call realizing method Download PDFInfo
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- CN101068279B CN101068279B CN200710111030XA CN200710111030A CN101068279B CN 101068279 B CN101068279 B CN 101068279B CN 200710111030X A CN200710111030X A CN 200710111030XA CN 200710111030 A CN200710111030 A CN 200710111030A CN 101068279 B CN101068279 B CN 101068279B
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Abstract
A method for realizing back-calling of emergency call includes launching back-calling to certain user device by emergency call center, setting this time of calling to be emergency call and directly calling up to said user device if the calling is judged to be an emergency call when this time of back-calling is received by service call session control function.
Description
Technical field
The present invention relates to the communications field, relate in particular to the implementation method that a kind of IP Multimedia System urgent call call-back is crossed over.
Background technology
When running into emergency (for example natural calamity etc.) and need relief, the user can pass through IP Multimedia System (IP Multimedia Subsystem), be called for short IMS) calling network particular number (China as 110,120, the U.S. is as 911 etc.), the contact emergency call center.After the on-hook of customer call EC, may be owing to reasons such as location expression are unclear, EC needs further understanding information, callback user.Further describe IMS urgent call framework and existing back calling method below.
Fig. 1 is an IMS urgent call reference frame.Whole framework comprises subscriber equipment (UserEquipment, be called for short UE) 101, Proxy Call Session Control Function (Proxy Call Session ControlFunction, be called for short P-CSCF) 102, service call conversation control function (Serving Call SessionControl Function, be called for short S-CSCF) 103, home subscriber server (Home SubscriberServer, be called for short HSS) 104, emergency call session controlled function (Emergency Call SessionControl Function, be called for short E-CSCF) 105, the position obtains function (Location RetrievalFunction, be called for short LRF) 106 and EC (Public Safety Answering Point is called for short PSAP) 107.
Wherein, P-CSCF 102 is agencies, is responsible for transmitting request and response between UE 101 and the S-CSCF 103.S-CSCF 103 is home service entities of UE, and being responsible for provides service logic and control of authority etc. to UE 101.HSS 104 preserves user's the register information and the business of customization etc.LRF 106 is responsible for providing to network active user's positional information.PSAP 107 is EC, is responsible for the urgent call of accepted user.
E-CSCF 105 has introduced a new functional entity in the IMS territory, itself and P-CSCF 102 are arranged in same network (being user's visited network when the user roams), the emergent session of being responsible for receiving from P-CSCF 102 is set up request, positional information that provides according to the user or positional information and the routing iinformation that obtains from LRF 106, ask the process Mm to be routed to emergent session foundation and be connected SIP network PSAP 107, or process Mi/Mj interface route is to being connected the PSTN PSAP 107 of (Public switch telephone network is called for short PSTN).If PSAP had both supported SIP also to support PSTN, then can unify setting, can certainly divide to be arranged, do not influence business function.In addition, PSAP 107 can directly obtain customer position information by the Le interface from LRF 106, get in touch the callback user by Mm/Mw interface and home network.
In the urgent call of IMS, except common Subscriber Number, specially for each user has distributed emergency telephone number, emergency telephone number comprises two kinds of form SIP and TEL.When the user carries out urgent call registration, or when after this carrying out urgent call, use be the emergency call user number.The emergency call user number only is used for emergence call service, is not subjected to the restriction of other business.When the user does not carry out the urgent call registration, only carried out common registration, even the urgent call use also is common subscriber number.The prior art requirement as user at home network the time, and has been carried out the non-emergency call registration, and portable terminal (MS) just can no longer carry out the registration of urgent call.At this moment when carrying out urgent call, what calling number was carried is common Subscriber Number.At this moment, PSAP 107 can only see and carry out callback by this common rear subscriber number that its callback flow is shown in Fig. 2,3.
In Fig. 2, based on the PSAP of PSTN network calling number according to caller identification, initiation is to the callback of emergency call user, to MGCF (Media Gateway ControlFunction, abbreviation MGCF) sends IAM (Initial Address Message, initial address message) request message (S201); MGCF carries out route according to called number, and (S202) initiates a session request to the query call controlled function of called ownership (Interrogating Call Session Control Function is called for short I-C SCF); I-CSCF is to the positional information (S203) of HSS request S-CSCF; HSS comprises the S-CSCF (S204) of the current registration of user to I-CSCF home position information; I-CSCF sends conversation request (S205) according to the S-CSCF that HSS returns; S-CSCF carries out called initial filter criteria, may trigger professional (S206) such as preceding commentaries on classics, calling obturations; If called professional without limits, S-CSCF sends conversation request (S207) according to the information of called registration to P-CSCF; P-CSCF sends conversation request (S208) according to destination address information to UE.In Fig. 3, PSAP is based on SIP (Session Initiate Protocol, conversation initialized protocol) and is connected with IP, can be directly to the IMS network-originated call.
The problem that existing scheme exists is if the common subscriber number of emergency call user has been opened business such as call blocking, Call Forwarding Unconditional, among step 206 or Fig. 3 during step 305, PSAP may not be according to the direct callback of common Subscriber Number to this user in execution graph 2.Yet the task that urgent call is handled all compares promptly, therefore, when the user initiates urgent call with the common subscriber number of its registration, as long as the user is in upstate, no matter open what limit service, provide a kind of directly callback very necessary to this user's method.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of callback implementation method of urgent call, no matter which kind of limit service the user opens, the user after initiating urgent call with common subscriber number, EC all directly callback to the user of initiation urgent call.
In order to solve the problems of the technologies described above, the invention provides a kind of callback implementation method of urgent call, may further comprise the steps:
(a) EC is initiated the callback to certain subscriber equipment, and callback this time is set to urgent call;
(b) after service call conversation control function receives this callback,, then carry out to call out and cross over, promptly directly call described subscriber equipment if judging that this is called out is urgent call.
Further, said method also can have following characteristics, and described subscriber equipment had carried out the non-emergency call registration before the call emergency call center.
Further, said method also can have following characteristics, the dialogue-based initializtion protocol of described EC, described step (a) further comprises: described EC is initiated the callback to certain subscriber equipment, send conversation request message to the query call conversation control function, the urgent call sign is set in described conversation request message; After described query call conversation control function is received described conversation request message, inquire the service call conversation control function of described user equipment registration, transmit described conversation request message to this service call conversation control function from home subscriber server.
Further, said method also can have following characteristics, described EC is based on PSTN, and described step (a) further comprises: described EC is initiated the callback to certain subscriber equipment, sends the initial address request message to MGCF; After described MGCF is received described initial address request message,, then send conversation request message, the urgent call sign is set in described conversation request message to the query call conversation control function if judging that this is called out is urgent call; After described query call conversation control function is received described conversation request message, inquire the service call conversation control function of described user equipment registration, transmit described conversation request message to this service call conversation control function from home subscriber server.
Further, said method also can have following characteristics, and described MGCF judges that whether this calling is that urgent call is to carry out with in judging any one: whether the type of call of judging this calling is urgent call; Whether the caller of judging this calling is EC; Judge whether to satisfy any one in following two conditions: the type of call of this calling is urgent call, and the calling number of this calling is an EC; If above judged result is for being that then this is called out and is urgent call.
Further, said method also can have following characteristics, and described type of call is provided with in described initial address request message by described EC.
Further, said method also can have following characteristics, described step (b) further comprises: described service call conversation control function judges that this calling is urgent call, and then the Proxy Call Session Control Function under described subscriber equipment sends conversation request message; After described Proxy Call Session Control Function receives described conversation request message, judge that this calling is urgent call, then send conversation request to described subscriber equipment, realize callback according to the target address information in the conversation request.
Further, said method also can have following characteristics, described service call conversation control function and Proxy Call Session Control Function judge whether this calling is that urgent call is according to whether the sign of urgent call is arranged in the described conversation request message, if this sign is arranged then think that this calling is urgent call.
Further, said method also can have following characteristics, if described Proxy Call Session Control Function judges that this is called out and be urgent call that then priority treatment is this time called out.
Compared with prior art, because the present invention is in the call-back course of IMS emergency voice calls business, adopted the method that the urgent call sign is set by PSAP or MGCF, S-CSCF can cross over called limit service according to this sign, as long as the user is in upstate, just can directly call the user, guarantee in the shortest time, to get in touch with the user.
Description of drawings
Fig. 1 is the reference frame schematic diagram of IMS urgent call in the prior art;
Fig. 2 is the IMS urgent call call-back flow chart that connects based on PSTN in the prior art;
Fig. 3 is the IMS urgent call call-back flow chart that is connected with IP based on SIP in the prior art;
Fig. 4 is the IMS urgent call call-back flow chart based on the PSTN connection of present embodiment;
Fig. 5 is the IMS urgent call call-back flow chart that is connected with IP based on SIP of present embodiment.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 4 is the IMS urgent call call-back flow chart that connects based on PSTN, as shown in Figure 4, the user is connected to the calling number of the PSAP of PSTN according to caller identification after initiating urgent call with the common subscriber number of its registration, initiation may further comprise the steps the callback of IMS emergency call user:
Step 401, PSAP sends the IAM request message to MGCF, and PSAP is in the IAM request message, and the type of call that caller is set is an emergence call service;
Step 402, MGCF judges the urgent call of this calling for the PSAP callback according to the type of call of caller, the structure conversation request message is provided with the urgent call sign in conversation request;
In another embodiment, whether MGCF is for being that urgent call is except judging by above-mentioned type of call, can also determine by analysis calling number, promptly in step 401, PSAP can not carry out the setting of type of call, and in this step, analyzes calling number by MGCF, if judge that the caller of this time calling out is PSAP, the urgent call sign is set in conversation request then.
In other embodiments, MGCF also can comprehensively determine to the judgement of type of call and the analysis of calling number whether this calling is urgent call, be after MGCF receives IAM message, judge at first whether this call request is urgent call, if, the urgent call sign then is set in conversation request, otherwise, MGCF analyzes the calling number of call request again according to local policy, judges whether to be the calling from PSAP, if, the urgent call sign is set, otherwise MGCF handles it as ordinary call in conversation request.
Step 403, MGCF carries out route according to called number, initiates a session request to the I-CSCF of called ownership, carries the sign of urgent call in the conversation request;
Step 404, I-CSCF is to the positional information of the S-CSCF of the current registration of HSS request user, the i.e. domain name of S-CSCF or IP address;
Step 405, HSS returns the positional information of the S-CSCF of the current registration of user to I-CSCF;
Step 406, the S-CSCF that I-CSCF returns according to HSS transmits conversation request to S-CSCF;
Step 407, S-CSCF carries out called initial filter criteria, judges the sign whether urgent call is arranged in the conversation request, if have, carry out next step, carry out to call out and cross over, no matter which kind of call blocking business the user opens and directly calls this subscriber equipment, otherwise, handle by common session;
The user is as long as register, and S-CSCF just can learn user Ke Da or available.
Step 408, S-CSCF finds called affiliated P-CSCF according to the contact address information of called registration, sends conversation request to this P-CSCF;
Step 409, P-CSCF receives conversation request, judges the sign whether urgent call is arranged in the conversation request, if having, then sends conversation request according to the target address information in the conversation request to UE, realizes callback.
P-CSCF can be treated to this session priority and be higher than other session.
As PSAP during based on SIP, PSAP is according to the calling number of caller identification, initiates to may further comprise the steps to the callback flow of IMS emergency call user as shown in Figure 5:
Step 501, PSAP initiates the callback to emergency call user according to the calling number of caller identification, directly adds the urgent call sign in conversation request;
Step 502, PSAP carries out route according to called number, initiates a session request to the I-CSCF of called ownership, carries the urgent call sign in the conversation request;
Step 503-508 with flow process among Fig. 4, repeats no more herein.
In sum, the present invention adds the urgent call sign when the callback by PSAP or MGCF, S-CSCF is according to the sign of urgent call, no matter whether the user has opened the relevant business (as calling out business such as obturation, Call Forwarding Unconditional) of call blocking, can directly call the user, from having improved promptness, the validity that EC and warning personnel link up.
Claims (9)
1. the callback implementation method of a urgent call may further comprise the steps:
(a) EC is initiated the callback to certain subscriber equipment, and the urgent call sign is set in the conversation request message that sends;
(b) after service call conversation control function receives this callback,, then carry out to call out and cross over, promptly cross over the limit service of described subscriber equipment, directly call described subscriber equipment if judging that this is called out is urgent call.
2. the method for claim 1 is characterized in that, described subscriber equipment had carried out the non-emergency call registration before the call emergency call center.
3. the method for claim 1 is characterized in that, the dialogue-based initializtion protocol of described EC, and described step (a) specifically comprises:
Described EC is initiated the callback to certain subscriber equipment, sends conversation request message to the query call conversation control function, and the urgent call sign is set in described conversation request message;
After described query call conversation control function is received described conversation request message, inquire the service call conversation control function of described user equipment registration, transmit described conversation request message to this service call conversation control function from home subscriber server.
4. the method for claim 1 is characterized in that, described EC is based on PSTN, and described step (a) specifically comprises:
Described EC is initiated the callback to certain subscriber equipment, sends the initial address request message to MGCF;
After described MGCF is received described initial address request message,, then send conversation request message, the urgent call sign is set in described conversation request message to the query call conversation control function if judging that this is called out is urgent call;
After described query call conversation control function is received described conversation request message, inquire the service call conversation control function of described user equipment registration, transmit described conversation request message to this service call conversation control function from home subscriber server.
5. method as claimed in claim 4 is characterized in that, described MGCF judges that whether this calling is that urgent call is to carry out with in judging any one:
Whether the type of call of judging this calling is urgent call;
Whether the caller of judging this calling is EC;
Judge whether to satisfy any one in following two conditions: the type of call of this calling is urgent call, and the calling number of this calling is an EC;
If above judged result is for being that then this is called out and is urgent call.
6. method as claimed in claim 5 is characterized in that, described type of call is provided with in described initial address request message by described EC.
7. the method for claim 1 is characterized in that, described step (b) specifically comprises:
Described service call conversation control function judges that this calling is urgent call, and then the Proxy Call Session Control Function under described subscriber equipment sends conversation request message;
After described Proxy Call Session Control Function receives described conversation request message, judge that this calling is urgent call, then send conversation request to described subscriber equipment, realize callback according to the target address information in the conversation request message.
8. method as claimed in claim 7, it is characterized in that, described service call conversation control function and Proxy Call Session Control Function judge whether this calling is that urgent call is according to whether the sign of urgent call is arranged in the described conversation request message, if this sign is arranged then think that this calling is urgent call.
9. method as claimed in claim 7 is characterized in that, if described Proxy Call Session Control Function judges that this is called out and be urgent call that then priority treatment is this time called out.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710111030XA CN101068279B (en) | 2007-06-13 | 2007-06-13 | Emergency call return call realizing method |
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| CN200710111030XA CN101068279B (en) | 2007-06-13 | 2007-06-13 | Emergency call return call realizing method |
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| CN101068279A CN101068279A (en) | 2007-11-07 |
| CN101068279B true CN101068279B (en) | 2011-01-19 |
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| CN200710111030XA Expired - Fee Related CN101068279B (en) | 2007-06-13 | 2007-06-13 | Emergency call return call realizing method |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101577889B (en) * | 2008-11-11 | 2011-08-10 | 中兴通讯股份有限公司 | Emergency call system and method for calling back emergency communication acceptance center |
| CA2758430C (en) * | 2009-04-17 | 2016-08-23 | Nec Corporation | Mobile communication system, base station, gateway apparatus, core network apparatus, and communication method |
| CN102026127A (en) * | 2009-09-18 | 2011-04-20 | 中兴通讯股份有限公司 | Method, device and system for realizing emergency call override service |
| CN103139745A (en) * | 2013-01-31 | 2013-06-05 | 中兴通讯股份有限公司 | Implement method and system of emergency call and service device of belonging network and visiting network |
| CN104917717B (en) * | 2014-03-10 | 2018-09-07 | 中国移动通信集团北京有限公司 | A kind of method of calling, equipment and system |
| CN106559768A (en) * | 2015-09-24 | 2017-04-05 | 联芯科技有限公司 | Emmergency call method, urgent call call-back method and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498029A (en) * | 2002-10-16 | 2004-05-19 | ��Ѹ�Ƽ���˾ | Emergency call-back method |
| CN1732678A (en) * | 2002-12-31 | 2006-02-08 | 摩托罗拉公司 | Emergency call-back for mobile terminals in a limited service mode |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498029A (en) * | 2002-10-16 | 2004-05-19 | ��Ѹ�Ƽ���˾ | Emergency call-back method |
| CN1732678A (en) * | 2002-12-31 | 2006-02-08 | 摩托罗拉公司 | Emergency call-back for mobile terminals in a limited service mode |
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