CN101051935B - Method for realizing SIP signalling net management - Google Patents

Method for realizing SIP signalling net management Download PDF

Info

Publication number
CN101051935B
CN101051935B CN2006100781868A CN200610078186A CN101051935B CN 101051935 B CN101051935 B CN 101051935B CN 2006100781868 A CN2006100781868 A CN 2006100781868A CN 200610078186 A CN200610078186 A CN 200610078186A CN 101051935 B CN101051935 B CN 101051935B
Authority
CN
China
Prior art keywords
communication equipment
sip
message
network management
signaling network
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN2006100781868A
Other languages
Chinese (zh)
Other versions
CN101051935A (en
Inventor
练仑
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN2006100781868A priority Critical patent/CN101051935B/en
Priority to PCT/CN2007/000619 priority patent/WO2007124645A1/en
Publication of CN101051935A publication Critical patent/CN101051935A/en
Application granted granted Critical
Publication of CN101051935B publication Critical patent/CN101051935B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H04L67/125—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks involving control of end-device applications over a network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/34—Signalling channels for network management communication

Abstract

The method includes following steps: (1) through SIP message, first communication device informs management information of SIP signaling network to second communication device; (2) after receiving SIP message, second communication device executes corresponding processes based on management information of SIP signaling network. The invention increases call completing rate, and prevents waste of signaling resources.

Description

A kind of method that realizes the SIP signaling network management
Technical field
The present invention relates to a kind of signaling network management technology, particularly a kind of method that realizes the SIP signaling network management.
Background technology
SIP (Session Initiation Protocol, session initiation protocol) is the control protocol of an application layer, is mainly used in foundation, revises and stops Multimedia session (or meeting), realizes the control to Multimedia session (or meeting).SIP is made up of SIP basic agreement and a series of SIP expansion, the SIP basic agreement is by IETF (The Internet Engineering Task Force, the Internet engineering duty group) RFC 3261 definition, the SIP expansion then is made up of a series of document, mainly comprises nearly 20 several manuscripts such as RFC 3262, RFC 3311, RFC3323, RFC 3325, RFC 3455, RFC 3903.Wherein, expanded PUBLISH at RFC3903.
3GPP standardization body on RFC 3455 bases according to UMTS (Universal MobileTelecommunications System, universal mobile telecommunications system) characteristics of Network further expand SIP, 3GPP (3rd Generation Partnership Projects, third generation partnership project) mainly contains 24.229 at the document of SIP mobility expansion.In 24.229 documents, define the sip message that IMS (IPMultimedia Subsystem, IP Multimedia System) system can adopt and comprised REGISTER, INVITE, ACK, PRACK, INFO, NOTIFY, OPTIONS, MESSAGE, SUBSCRIBE, REFER and UPDATE.
Session Initiation Protocol relates to two quasi-protocol entities based on the client/server mode of operation: the sip user agent and the SIP webserver.The end system of the former corresponding calling comprises user agent client (UAC-UserAgent Client) and subscriber proxy server (UAS-UserAgent Server), is equivalent to caller and called respectively.Such division makes the Session Initiation Protocol of Client can finish the control that equity in the communication network is called out.The latter then is the network equipment of handling call signaling, and its basic function is address resolution and user location, comprises acting server (proxy) and reorientation server (redirect) two classes.Acting server is similar to HTTP (Hypertext Transfer Protocol, HTML (Hypertext Markup Language)) proxy or SMTP (Simple Mail Transfer Protocol, Simple Mail Transfer protocol) MTA (MessageTransfer Agent, message transfer agent), after the request of accepting session, determine Next Hop Server according to called address, forward pass should request then.The reorientation server has the effect that is similar to dns server.Its not forward pass request, but the result of address resolution gained is returned the announcement caller, direct and Next Hop Server contact by caller.
SIP has and realizes that simple, favorable expandability, Multimedia session providing capability and service expansion capability are strong, having powerful user searches and stationkeeping ability, and advantage such as get in touch closely with existing Internet agreement, thereby obtained widely to use, especially Session Initiation Protocol is adopted call control protocol as UMTS (universal mobile telecommunications system) R5/R6 IP multimedia subsystem, IMS (IMS) by 3GPP standardization body.
Along with the increase of the number of devices that adopts SIP to communicate, the signaling network management function that operation manages to SIP in communication is also more and more important.The purpose of signaling network management function is can carry out reconfiguring of signaling network when device fails, and the control of carrying out telephone traffic when network congestion.Owing to there is not the method for the relevant signaling network management of definition among the SIP, when device fails or network occur when congested, neighbouring device can't know that follow-up calling can continue to send to faulty equipment or congested network, thereby causes the waste of non-answered call or signal resource.
Summary of the invention
The object of the invention is, a kind of method of the SIP of realization signaling network management is provided, and guarantees can exchange reliably between the communication equipment available information about signaling, thereby improves the waste of percept of call completed and minimizing signal resource.
A kind of method that realizes session initiation protocol SIP signaling network management may further comprise the steps:
Steps A, first communication equipment is notified second communication equipment by sip message with SIP signaling network management information;
Step B, second communication equipment are after receiving sip message, according to SIP signaling network management information realization SIP signaling network management wherein.
In step B, second communication equipment further sends to first communication equipment and replys accordingly after receiving sip message.
Further, before steps A, can comprise:
Step 100, second communication equipment sends sip subscribe message to first communication equipment, subscribes to SIP signaling network management information;
Step 110, first communication equipment are replied accordingly to the transmission of second communication equipment behind the sip subscribe message that receives from second communication equipment.
Above-mentioned signaling network management information can be carried in sip message by predefined sip event bag and internet multipurpose mail extension type.
Described signaling network management information comprises: forbid that the transmission of second communication equipment goes to the permission of forbidding transmission information, allowing second communication equipment to transmit the business of going to first communication equipment of the business of first communication equipment and transmit the controlled delivery information that information or control second communication equipment transmit the traffic carrying capacity of the business of going to first communication equipment.Wherein, controlled delivery information has defined the adjustment that corresponding congestion level is carried out the traffic carrying capacity size according to the congestion situation of communication equipment.
Described sip message is INFO, NOTIFY, PUBLISH, OPTIONS message or MESSAGE message.Described communication equipment is mobile switching centre's simulator.
Compared with prior art, the invention has the beneficial effects as follows:
1. can exchange available information between the communication equipment reliably, make the SIP signaling to be managed about the SIP signaling;
2. when a certain communication equipment breaks down, adjacent communication equipment can be known this information immediately, thereby avoided follow-up calling is continued to send to faulty equipment, simultaneously, neighbouring device can be chosen normal device and carry out signal switching, guarantee to call out and normally continue, avoided the waste of signal resource;
3. occur when congested when a certain communication equipment, adjacent communication equipment can be known corresponding information immediately, and sends to the traffic carrying capacity of congested equipment according to this information adjustment, thereby has improved the call completing rate of calling out;
4. after recovering after the congested end of communication equipment or from malfunction, adjacent communication equipment can be known corresponding information immediately, and recovers to send to the congested communication equipment of former appearance or the traffic carrying capacity of the communication equipment that breaks down, thereby has improved usage ratio of equipment.
Description of drawings
Fig. 1 realizes the indicative flowchart of the method for SIP signaling network management for the present invention;
Fig. 2 transmits the schematic diagram of SIP signaling network management information for the present invention adopts INFO;
Fig. 3 transmits the schematic diagram of SIP signaling network management information for the present invention adopts NOTIFY.
Embodiment
Fig. 1 has illustrated that the present invention realizes the indicative flowchart of the method for SIP signaling network management, and wherein, communication equipment is sent to one or more adjacent communication equipments with signaling network management information and realizes the SIP signaling network management.2 the adjacent communication equipments that only drawn among Fig. 1 have a plurality of communication equipments in the actual conditions.As shown in Figure 1, first communication equipment can be with the relevant adjacent second communication equipment of SIP signaling network management information notification, and second communication equipment sends to first communication equipment and to reply and to operate accordingly according to this information and executing after receiving this information.
For example: when first communication equipment breaks down, will forbid transmitting information notification second communication equipment, second communication equipment is received after this information to respond to first communication equipment and is answered and stop immediately transmitting and belong to the business of going to first communication equipment; After first communication equipment recovers from fault, will allow to transmit information notification second communication equipment, second communication equipment is received after this information to respond to answer and recover immediately to transmit to first communication equipment and is belonged to the business of going to first communication equipment; First communication equipment detects the equipment congestion situation, and with controlled delivery information notification second communication equipment, second communication equipment is received after this information to respond to answer and transmit according to the congestion level adjustment to first communication equipment and belonged to the traffic carrying capacity of going to first communication equipment.
It is pointed out that said communication equipment breaks down among the present invention, be meant that break down in communication equipment inside and this fault does not influence this communication equipment to its adjacent communication equipment sending message.
In specific implementation, the present invention is self-defined a kind of sip event bag " smm ", a kind of new MINE (Multipurpose Internet Mail Extensions, internet multipurpose mail extension) type " application/smm " is used for carrying and forbids transmitting, allows to transmit and controlled delivery signaling network management information.
According to ABNF (Augmented Backus-Naur Form, the Backus normal form (BNF) of enhancing) method, smm specifically is defined as:
MessageEvent＝Inhibit/Uninhibit/Congestion
CongestionLevel＝“CL”COLON(1*1DIGIT)
Wherein, Inhibit represents to forbid transmission information, and Uninhibit represents to allow transmission information, and Congestion represents controlled delivery information.Defined the congestion level of 4 kinds of different stages in the controlled delivery information: 0 grade (CongestionLevel=0) represents congested end; 1 grade (CongestionLevel=1) expression occurs congested, needs to reduce traffic carrying capacity to 25% of normal amount; 2 grades (CongestionLevel=2) expression occurs congested, needs to reduce traffic carrying capacity to 50% of normal amount; 3 grades (CongestionLevel=3) expression occurs congested, needs to reduce traffic carrying capacity to 75% of normal amount.Here just illustrate, under different situations, can carry out the adjustment of traffic carrying capacity according to the different congestion level of corresponding needs definition with 4 kinds of congestion levels.
In the present invention, can adopt multiple sip message to transmit above-mentioned SIP signaling network management information between communication equipment.Figure 2 shows that the schematic diagram that adopts INFO to transmit SIP signaling network management information.The communication equipment that provides among Fig. 2 is 2 MSCe (Mobile Switching Center emulation, mobile switching centre's simulators), and actual conditions are not limited thereto, and can be the communication equipment that a plurality of employing SIP communicate.
As shown in Figure 2, MSCe1 is breaking down or when congested, by INFO corresponding SIP signaling network management information is delivered to MSCe2, MSCe2 replys 200 expressions to the MSCe1 transmission and receives INFO after receiving INFO, and operates accordingly according to the signaling network management information and executing in the INFO.
Specify below and adopt the INFO transmission to forbid transmission information, allow the flow process of transmission information and controlled delivery information.
Wherein, adopt the INFO transmission to forbid that the flow process of the information of transmitting may further comprise the steps:
Step 100 after MSCe1 breaks down, sends and carries the INFO notice MSCe2 that forbids the information of transmitting, and message body is:
Content-Type：application/smm
Content-Length：
MessageEvent＝Inhibit；
Step 110, MSCe2 sends to MSCe1 and replys 200, and INFO is received in expression, and stops immediately transmitting and belong to the business of going to MSCe1.
Adopt the INFO transmission to allow the flow process of transmission information may further comprise the steps:
Step 100 after the MSCe1 fault recovery, sends and carries the INFO notice MSCe2 that allows transmission information, and message body is:
Content-Type：application/smm
Content-Length：
MessageEvent＝Uninhibit；
Step 110, MSCe2 sends to MSCe1 and replys 200, and expression is received INFO and is recovered immediately to transmit and belongs to the business of going to MSCe1.
In addition, the flow process that adopts the INFO transfer controlled to transmit information may further comprise the steps:
Step 100, MSCe1 sends the INFO notice MSCe2 that carries controlled delivery information according to congestion situation, and message body is:
Content-Type：application/smm
Content-Length：
MessageEvent＝Congestion
CongestionLevel＝n：
Wherein, n represents congestion level, can set according to different situations.For convenience of description, equaling 0,1,2 or 3 with n below describes.
Step 110, MSCe2 sends to MSCe1 and replys 200, and INFO is received in expression, and takes the control of corresponding business amount according to congestion level:
Congestedly or congested finishing does not appear in 0 grade (CongestionLevel=0) expression, needs to belong to the traffic carrying capacity of going to MSCe1 and returns to normal amount;
1 grade (CongestionLevel=1) expression occurs congested, needs to go to the MSCe1 traffic carrying capacity and reduces to 25% of normal amount;
2 grades (CongestionLevel=2) expression occurs congested, needs to go to the MSCe1 traffic carrying capacity and reduces to 50% of normal amount;
3 grades (CongestionLevel=3) expression occurs congested, needs to go to the MSCe1 traffic carrying capacity and reduces to 75% of normal amount.
In addition, can also adopt NOTIFY to transmit SIP signaling network management information between communication equipment.Figure 3 shows that the present invention adopts NOTIFY to transmit the schematic diagram of SIP signaling network management information:
Concrete steps comprise:
Step 300, at first, MSCe2 sends SUBSCRIBE message to MSCe1, subscribes to the SIP signaling network management message
Step 310, MSCe1 sends to MSCe2 and replys 200, and SUBSCRIBE message is received in expression;
Step 320 is when MSCe1 breaks down, fault recovery or when detecting congestion change, MSCe1 informs MSC2 with corresponding signaling network management information by NOTIFY;
Step 330, MSCe2 replys 200 expressions to the MSCe1 transmission and receives NOTIFY after receiving NOTIFY, and operates accordingly according to the signaling network management information and executing in the NOTIFY.
Transmitting SIP signaling network management information with the employing INFO compares, adopt NOTIFY to transmit the subscription procedure that SIP signaling network management informational needs carries out step 300 and step 310, and for break down as MSCe1, fault recovery or when detecting congestion change, MSCe1 is identical with the operation that MSCe2 carries out, and difference only is to be used to transmit the type of message difference of SIP signaling network management information.
Can also adopt PUBLISH, OPTIONS or MESSAGE message to transmit SIP signaling network management information between communication equipment.Adopt above-mentioned message to realize that the method for SIP signaling network management realizes that with adopting INFO the method for SIP signaling network management is identical substantially, difference just is, signaling network management message adopts PUBLISH or OPTIONS or MESSAGE message to transmit, rather than INFO transmits.In addition, also can adopt with the present invention in different message body transmit signaling network management message.
As can be seen from the above description, the method by the present invention realizes the SIP signaling network management can obtain following effect:
1. can exchange available information between the communication equipment reliably, make the SIP signaling to be managed about the SIP signaling;
2. when a certain communication equipment breaks down, adjacent communication equipment can be known this information immediately, thereby avoided follow-up calling is continued to send to faulty equipment, simultaneously, neighbouring device can be chosen normal device and carry out signal switching, guarantee to call out and normally continue, avoided the waste of signal resource;
3. occur when congested when a certain communication equipment, adjacent communication equipment can be known corresponding information immediately, and sends to the traffic carrying capacity of congested equipment according to this information adjustment, thereby has improved the call completing rate of calling out;
4. after recovering after the congested end of communication equipment or from malfunction, adjacent communication equipment can be known corresponding information immediately, and recovers to send to the congested communication equipment of former appearance or the traffic carrying capacity of the communication equipment that breaks down, thereby has improved usage ratio of equipment.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (8)

1. a method that realizes session initiation protocol SIP signaling network management is characterised in that, may further comprise the steps:
Steps A, first communication equipment is notified second communication equipment by sip message with SIP signaling network management information;
Step B, second communication equipment are after receiving sip message, according to the processing of wherein SIP signaling network management information and executing correspondence; Wherein,
Described signaling network management information comprises: forbid that the transmission of second communication equipment goes to the permission of forbidding transmission information, allowing second communication equipment to transmit the business of going to first communication equipment of the business of first communication equipment and transmit the controlled delivery information that information or control second communication equipment transmit the traffic carrying capacity of the business of going to first communication equipment.
2. method according to claim 1 is characterized in that, in step B, second communication equipment further sends to first communication equipment and replys accordingly after receiving sip message.
3. method according to claim 2 is characterized in that, further comprises step before steps A:
Step 100, second communication equipment sends sip subscribe message to first communication equipment, subscribes to SIP signaling network management information.
4. method according to claim 3 is characterized in that, further comprises step between step 100 and steps A:
Step 110, first communication equipment are replied accordingly to the transmission of second communication equipment behind the sip subscribe message that receives from second communication equipment.
5. method according to claim 1 is characterized in that, carries described signaling network management information by predefined sip event bag and internet multipurpose mail extension type in sip message.
6. method according to claim 1 is characterized in that, described sip message is INFO, NOTIFY, PUBLISH, OPTIONS message or MESSAGE message.
7. method according to claim 1 is characterized in that, described controlled delivery information has defined corresponding congestion level according to the congestion situation of communication equipment and carried out the adjustment of traffic carrying capacity size.
8. method according to claim 1 is characterized in that, described communication equipment is mobile switching centre's simulator.
CN2006100781868A 2006-04-28 2006-04-28 Method for realizing SIP signalling net management Active CN101051935B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2006100781868A CN101051935B (en) 2006-04-28 2006-04-28 Method for realizing SIP signalling net management
PCT/CN2007/000619 WO2007124645A1 (en) 2006-04-28 2007-02-27 A method system and communicating apparatus for realizing the management of sip signaling network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2006100781868A CN101051935B (en) 2006-04-28 2006-04-28 Method for realizing SIP signalling net management

Publications (2)

Publication Number Publication Date
CN101051935A CN101051935A (en) 2007-10-10
CN101051935B true CN101051935B (en) 2010-09-15

Family

ID=38655049

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2006100781868A Active CN101051935B (en) 2006-04-28 2006-04-28 Method for realizing SIP signalling net management

Country Status (2)

Country Link
CN (1) CN101051935B (en)
WO (1) WO2007124645A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109525625B (en) * 2017-09-20 2020-12-22 华为技术有限公司 Information subscription method and device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1499804A (en) * 2002-11-12 2004-05-26 ���ǵ�����ʽ���� Method of processing session information of session initiating agreement system, and its recording medium
CN1635765A (en) * 2003-12-31 2005-07-06 华为技术有限公司 A SIP network structure and method for implementing SIP group call
CN1647548A (en) * 2001-12-07 2005-07-27 艾利森电话股份有限公司 Service access and conferencing system and method in a telecommunications network

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10148469A1 (en) * 2001-10-01 2003-04-30 Siemens Ag Signaling method and arrangement
US8081586B2 (en) * 2004-04-07 2011-12-20 Nokia Corporation Method and apparatus to convey a URI for content indirection use in SIP
US7680450B2 (en) * 2004-05-17 2010-03-16 Telit Communications S.P.A. Method and user equipment for jamming detection and signalling in a mobile telecommunications network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1647548A (en) * 2001-12-07 2005-07-27 艾利森电话股份有限公司 Service access and conferencing system and method in a telecommunications network
CN1499804A (en) * 2002-11-12 2004-05-26 ���ǵ�����ʽ���� Method of processing session information of session initiating agreement system, and its recording medium
CN1635765A (en) * 2003-12-31 2005-07-06 华为技术有限公司 A SIP network structure and method for implementing SIP group call

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
何彬.基于SIP的多方通信控制和管理技术研究.中国科学院研究生院硕士学位论文.2005,12-38. *
说明书第10页第18行到第12页第12行.
说明书第3页第8-16行.
说明书第4页第20行到第5页第6行.

Also Published As

Publication number Publication date
WO2007124645A1 (en) 2007-11-08
CN101051935A (en) 2007-10-10

Similar Documents

Publication Publication Date Title
CN101809961B (en) Failure recovery in an IP multimedia subsystem network
CN101330748B (en) Method for switching control route of IP multimedia subsystem centralized business conversation
EP2207336B1 (en) Method, system and device of call forwarding
KR100687827B1 (en) A method of communication and communication system
CN101132542B (en) Method and device for connecting urgent call in wireless network
CA2483240C (en) Congestion control in an ip network
CN101448232B (en) Method for realizing emergency call, and system and user equipment thereof
CN100450024C (en) Method for monitoring multi-medium sub-system domain
CN100592703C (en) Call control method and circuit switching field adapter as well as terminal equipment
CN100466850C (en) Implementation method to trigger SIP terminal registration, and system, SIP server and SIP terminal
CN101459533B (en) System and method for improved application server disaster tolerance in next generation network
CN101051935B (en) Method for realizing SIP signalling net management
CN100574348C (en) A kind of method that realizes user determination user busy forward shifting
CN101102610A (en) A method for realizing user busy call forward in IMS centrally controlled service
CN101448223B (en) Method for realizing call holding and call recover of circuit switched domain accessed IP multimedia subsystem
CN101286951B (en) Session preemption method
KR100996568B1 (en) Apparatus and method for processing routing in IMS
CN100433858C (en) PoC media stream service controlling method and system
CN101567797B (en) Method and system for realizing transfer class service
CN101304323B (en) Method for implementing centralization of explicit call diverting service in IP multimedia subsystem
CN101330394A (en) Method for simultaneously playing multimedia information for calling during call establishment process
KR100996569B1 (en) System and method for processing accounting
CN101115237A (en) Method for performing call deflexion in IP multimedia subsystem centralized control service
CN101330746B (en) Method and system for implementing call deflection of IMS central control business
CN101127958B (en) Method for forward call in central control service of IP multimedia sub-system

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant