CN101212521B - Method for implementing hotline service in IP multimedia subsystem - Google Patents
Method for implementing hotline service in IP multimedia subsystem Download PDFInfo
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- CN101212521B CN101212521B CN2006101698675A CN200610169867A CN101212521B CN 101212521 B CN101212521 B CN 101212521B CN 2006101698675 A CN2006101698675 A CN 2006101698675A CN 200610169867 A CN200610169867 A CN 200610169867A CN 101212521 B CN101212521 B CN 101212521B
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Abstract
The invention discloses a method for realizing hotline service in an IP multimedia subsystem, which comprises the following processes: after a device with the function of controlling an access gateway detects hand-on information of the user, the operation indicated by indication information is carried out according to the indication information which is saved in advance and is obtained from an application server of simulation service of PSTN. By saving the indication information which is obtained from the application server of simulation service of PSTN in advance in the device with the function of controlling the access network, the invention can allow the device with the function of controlling the access network to carry out relevant operation according to the indication information after detecting the hand-on information of the user, thus realizing the hotline service in the IP multimedia subsystem.
Description
Technical field
The present invention relates to a kind of implementation method of hot line service, the implementation method of hot line service belongs to communication technical field in particularly a kind of IP Multimedia System.
Background technology
IP Multimedia System (IP Multimedia Subsystem is called for short IMS) is the subsystem of the general cooperative programme of the third generation (3GPP) at the support IP multimedia service of R5 version proposition.The core characteristics of IMS are to adopt Session Initiation Protocol, and the independence that has and insert, so IMS is the essential step that strides forward to all-IP network service system.3GPP, ETSI and ITU-T are in the network integration scheme of research based on IMS under the development trend of the network integration; Purpose is to make IMS become the general-purpose platform based on the SIP session; Thereby for following multimedia application provides a general business platform; And support plurality of access modes fixing and that move simultaneously, realize the fusion of fixed network and mobile network.But difference aspect professional ability of fixing and mobile IMS, the difference of architectural framework, the problems such as difference of agreement will become the key issue that can IMS realize that fixed network and mobile network are merged.
IMS provides the service needed of emulation public switch telephone network (Public Switched Telephone Network is called for short PSTN) to do more expansion in order to support to the fixed network user.The service feature of hot line service is among the PSTN: the user behind off-hook the stipulated time (as 5 seconds) if in do not dial; Get final product the called number (also claim hot line number) of automatic connection to corresponding preset; Its operation flow is described below: behind calling subscriber's off-hook, receive dialing tone; The calling subscriber receives ring-back tone after waiting for 5 seconds, simultaneously called subscriber's phone ringing; Both sides converse behind called subscriber's off-hook.And if instant hot line is professional, the called number that then will set when automatic connection is to RT register traffic immediately behind user's off-hook.From the above, the key technology point of hot line service is among the realization PSTN: switch sends calling to the predefined called number of this user after monitoring calling subscriber's off hook signal.
PSTN simulation services is the POTS terminal use to fixed network, requires the IMS network the indiscriminate business with PSTN to be provided to the user.This has higher requirement to IMS, requires IMS can not only realize that PSTN such as calling transfer, Call Waiting are professional, also will identical professional perception be provided to the user.Development along with PSTN simulation services; AGCF equipment (Access Gateway Control Function; Be called for short AGCF) become the key network element of realization PSTN simulation services gradually with PSTN simulation services application server (PSTN Emulation Service Application Server is called for short PES AS).But because service logic (being business processing flow) is carried out by PES AS; And the monitoring of user's off hook signal is carried out by AGCF; The separation of two functions has caused the realization of hot line service in IMS not carry out according to the implementation of hot line service among the PSTN, causes failing in the prior art to realize the hot line service among the IMS.
Summary of the invention
The objective of the invention is deficiency, the implementation method of hot line service in a kind of IP Multimedia System is provided, can realize the hot line service in the IP Multimedia System to above-mentioned prior art.
For realizing above-mentioned purpose; The present invention provides the implementation method of hot line service in a kind of IP Multimedia System; Comprise: the AGCF monitoring of equipment is after user's off-hook information; According to the indication information of preserving in advance after obtaining from the PSTN simulation services application server, accomplish the calling of hot line service, specifically comprise:
Said AGCF equipment judges whether the user dials in the preset time interval, if dialing then make a call to the number that the user dialled, if would not do not dial then the called number that in said indication information, comprises makes a call.
In the technique scheme; AGCF equipment is through preserve the indication information that obtains from the PSTN simulation services application server in advance; And carry out corresponding operation when user's off-hook according to this indication information; Thereby can overcome in the prior art service logic by the preservation of PSTN simulation services application server and execution, AGCF monitoring of equipment behind off hook signal; Can not carry out the defective of corresponding operating owing to do not preserve corresponding hot line service logic; Send indication information indication AGCF operation of equipment through the PSTN simulation services application server to AGCF equipment, thereby can realize the hot line service in the IP Multimedia System.
Preferably; In technique scheme; Before said AGCF monitoring of equipment arrives user's off-hook information; Can comprise that also said AGCF equipment preserves the operation of said indication information in advance; Specifically comprise: said PSTN simulation services application server monitor the user open hot line service and receive business datum after or after upgrading user's business datum, to said AGCF equipment dispatch order message, and in this notification message, comprise this user's who preserves in advance hot line service configuration information; After said AGCF equipment is received said notification message, said hot line service configuration information is preserved as said indication information.
At said PSTN simulation services application server before said AGCF equipment dispatch order message; Also can comprise: said AGCF equipment is after user registration success; Send subscribe message to said PSTN simulation services application server; Be used to subscribe to this user's hot line service configuration information, said hot line service configuration information comprises the called number of user preset and is used to indicate whether this user's business is the professional information of instant hot line.
Further; The calling of said completion hot line service can comprise: before said AGCF equipment judges whether the user dials in the preset time interval; At first judge according to said indication information whether this user's business is that instant hot line is professional, is that the called number that then in said indication information, comprises immediately makes a call.
Pass through aforesaid operations; The PSTN simulation services application server sends the notification message that comprises the hot line service configuration information to AGCF equipment; Make AGCF equipment can indicate whether to be the information of instant hot line business with being used to according to the called number that comprises in the said hot line service configuration information; After monitoring user's off-hook information, carry out correspondent service logic, thereby realize the hot line service among the IMS.
The present invention also provides the implementation method of hot line service in a kind of IP Multimedia System; This method comprises: the AGCF monitoring of equipment is after user's off-hook information; According to the indication information of preserving in advance after obtaining from the PSTN simulation services application server; Notify said PSTN simulation services application server to accomplish the calling of hot line service, specifically comprise:
Said AGCF equipment judges whether to report off-hook event according to said indication information, if report off-hook event then report off-hook event to said PSTN simulation services application server; If do not report off-hook event then wait for subscriber dialing and carry out general call flows;
Wherein, Said AGCF equipment is after reporting off-hook event to said PSTN simulation services application server; Operation below also carrying out: said AGCF equipment judges whether the report of user dialing information according to said indication information; If report of user dialing information then finish not is if whether report of user dialing information then judges dialled in the preset time interval, if subscriber dialing then to PSTN simulation services application server report of user dialing information; Comprise the called number that the user dials in the said subscriber dialing information, do not finish if the user dials;
After said PSTN simulation services application server is received off-hook event; Whether judgement receives the subscriber dialing information that said AGCF equipment sends in the preset time interval; If the called number of receiving then in said subscriber dialing information, comprising makes a call, if do not receive then make a call to the called number of user preset.
Preferably; In technique scheme; Before said AGCF monitoring of equipment arrives user's off-hook information; Can comprise that also said AGCF equipment preserves the operation of said indication information in advance; Specifically comprise: said PSTN simulation services application server monitor the user open hot line service and receive business datum after or after upgrading user's business datum, to said AGCF equipment dispatch order message, and comprise that in this notification message the hot line service of preserving in advance handles indication information; After said AGCF equipment is received said notification message, said hot line service is handled indication information preserve as said indication information.
At said PSTN simulation services application server before said AGCF equipment dispatch order message; Also can comprise: said AGCF equipment is after user registration success; Send subscribe message to said PSTN simulation services application server; The hot line service that is used to subscribe to this user is handled indication information, and this hot line service is handled indication information and comprised and be used to indicate whether the information that reports the information of off-hook event and be used to indicate whether the report of user dialing information.
Judge before the subscriber dialing information of in the preset time interval, whether receiving said AGCF equipment transmission at said PSTN simulation services application server; At first judge according to the hot line service data of user preset whether this user's business is that instant hot line is professional; Be then to make a call, otherwise judge in the preset time interval, whether to receive the subscriber dialing information that said AGCF equipment sends to the called number of user preset.
Pass through aforesaid operations; The PSTN simulation services application server sends the notification message that comprises hot line service processing indication information to AGCF equipment; Make AGCF equipment to handle the information that is used to indicate whether to report off-hook event that comprises in the indication information according to hot line service; After monitoring user's off-hook information through reporting off-hook event to the PSTN simulation services application server, thereby make the PSTN simulation services application server can carry out follow-up hot line service logic.
In sum; The present invention is through preserve the indication information that obtains from the PSTN simulation services application server in advance in AGCF equipment; Thereby make AGCF equipment after monitoring user's off-hook information; Can carry out corresponding operation according to this indication information, thereby can realize the hot line service in the IP Multimedia System.
Description of drawings
Fig. 1 is the schematic flow sheet of the preferred embodiment three of the implementation method of hot line service in the IP Multimedia System of the present invention;
Fig. 2 is the schematic flow sheet of the preferred embodiment four of the implementation method of hot line service in the IP Multimedia System of the present invention;
Fig. 3 is another schematic flow sheet of the preferred embodiment four of the implementation method of hot line service in the IP Multimedia System of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description.
Basic design of the present invention is to send the information that is used to indicate the hot line service logic by PSTN simulation services application server (PES AS) in advance to AGCF equipment (AGCF); And by this information of AGCF preservation; Thereby make that AGCF can be after monitoring user's off-hook information; Operate accordingly according to this information and executing, and then realize the hot line service among the IMS.
Conceive based on foregoing invention; The invention provides the implementation method of hot line service in a kind of IP Multimedia System; Comprise: the AGCF monitoring of equipment is after user's off-hook information; According to preserve in advance, from the indication information that the PSTN simulation services application server obtains, carry out the operation of this indication information indication.In said method, said indication information both can comprise whole hot line service logics, also can comprise the hot line service logic of part; In follow-up operation, both can accomplish the calling of hot line service by AGCF, and also can notify PES AS to accomplish the calling of hot line service by AGCF.In practical implementation; Those skilled in the art can pass through said method; Concrete applied environment according to hot line service is worked out concrete hot line service logic; Send the indication information comprise all or part of hot line service logic through PES AS to AGCF, and after monitoring user's off-hook information, refer to that according to this border information and executing operates accordingly, like the calling of accomplishing hot line service or notify PES AS to accomplish the calling of hot line service by AGCF.It will be understood by those of skill in the art that above-mentioned execution mode all should be within technical scheme of the present invention scope required for protection.
In IP Multimedia System of the present invention among the embodiment one of the implementation method of hot line service; Said PSTN simulation services application server monitor the user open hot line service and receive business datum after or after upgrading user's business datum; To said AGCF equipment dispatch order message, and in this notification message, comprise this user's of preservation hot line service configuration information in advance; After said AGCF equipment is received said notification message, said hot line service configuration information is preserved as said indication information; The AGCF monitoring of equipment after user's off-hook information, according to preserve in advance, from the indication information that the PSTN simulation services application server obtains, carry out the operation of this indication information indication.
Preferably; In the present embodiment one; The operation of this indication information indication of said execution can comprise: said AGCF equipment judges whether the user dials in the preset time interval; If dialing then make a call to the number that the user dialled is not if dial then the called number that in said indication information, comprises makes a call.At said PSTN simulation services application server before said AGCF equipment dispatch order message; Can comprise that also said PSTN simulation services application server preserves the operation of said hot line service configuration information in advance; Specifically comprise: said AGCF equipment is after user registration success; Send subscribe message to said PSTN simulation services application server; Be used to subscribe to this user's hot line service configuration information, said hot line service configuration information comprises the called number of user preset and is used to indicate whether this user's business is the professional information of instant hot line.The hot line service configuration information that said PSTN simulation services application server comprises in the notification message that said AGCF equipment sends also can comprise being used to indicate the user whether to cancel the information of hot line service.
In IP Multimedia System of the present invention among the embodiment two of the implementation method of hot line service; Said PSTN simulation services application server monitor the user open hot line service and receive business datum after or after upgrading user's business datum; To said AGCF equipment dispatch order message, and in this notification message, comprise the hot line service processing indication information of preserving in advance; After said AGCF equipment is received said notification message, said hot line service is handled indication information preserve as said indication information; The AGCF monitoring of equipment after user's off-hook information, according to preserve in advance, from the indication information that the PSTN simulation services application server obtains, carry out the operation of this indication information indication.
Preferably; In the present embodiment two; The operation of this indication information of said execution indication can comprise: said AGCF equipment judges whether to report off-hook event according to said indication information, if report off-hook event then report off-hook event to said PSTN simulation services application server; If do not report off-hook event then wait for subscriber dialing and carry out general call flows.At said PSTN simulation services server before said AGCF equipment dispatch order message; Can comprise that also said PSTN simulation services server preserves the operation that said hot line service is handled indication information in advance; Specifically comprise: said AGCF equipment is after user registration success; Send subscribe message to said PSTN simulation services application server; The hot line service that is used to subscribe to this user is handled indication information, and this hot line service is handled indication information and comprised and be used to indicate whether the information that reports the information of off-hook event and be used to indicate whether the report of user dialing information.
Fig. 1 is the schematic flow sheet of the preferred embodiment three of the implementation method of hot line service in the IP Multimedia System of the present invention; May further comprise the steps: in step 1; AGCF equipment is after user registration success; Send subscribe message to the PSTN simulation services application server, be used to subscribe to this user's hot line service configuration information, said hot line service configuration information comprises the called number of user preset and is used to indicate whether this user's business is the professional information of instant hot line; Then in step 2; The PSTN simulation services application server monitor this user open hot line service and receive business datum after or after upgrading this user's business datum; To AGCF equipment dispatch order message, and in this notification message, comprise said hot line service configuration information; Then in step 3, after AGCF equipment is received said notification message, said hot line service configuration information is preserved as indication information; In step 4; The AGCF monitoring of equipment after user's off-hook information, according to preserve in advance, from the indication information that the PSTN simulation services application server obtains, judge whether this user's business is that instant hot line is professional; Be execution in step 7 then, otherwise execution in step 5; In step 5, AGCF equipment judges whether the user dials in the preset time interval, if dial then execution in step 6, if do not dial then execution in step 7; In step 6, AGCF equipment finishes after the number that the user dialled makes a call; The called number that AGCF equipment comprises in said indication information in step 7 makes a call.
In this preferred embodiment three; The PSTN simulation services application server is through sending the notification message that comprises the hot line service configuration information to AGCF equipment; Make AGCF equipment can indicate whether to be the information of instant hot line business with being used to according to the called number that comprises in the said hot line service configuration information; After monitoring user's off-hook information, carry out correspondent service logic, thereby realize the hot line service among the IMS.
In the above-mentioned preferred embodiment three, the hot line service configuration information that said PSTN simulation services application server comprises in the notification message that said AGCF equipment sends also can comprise being used to indicate the user whether to cancel the information of hot line service.Correspondingly, in step 4, whether said AGCF monitoring of equipment also can at first cancel hot line service according to said indication information judges after user's off-hook information, be then to wait for subscriber dialing and carry out the generalized calls handling process; Otherwise judging that according to said indication information whether this user's business is that instant hot line is professional, is execution in step 7 then, otherwise execution in step 5.
Provided in the above-mentioned preferred embodiment three through the PSTN simulation services application server indication information that the hot line service logic is relevant and sent to AGCF equipment in advance; After monitoring user's off-hook information, accomplish the execution mode of the calling of hot line service by AGCF equipment according to the indication information of preserving in advance.Provide through the PSTN simulation services application server and will send to AGCF equipment through preferred embodiment four below with the relevant indication information of portion of hot line service logic; By AGCF equipment after monitoring user's off-hook information; Send information according to the indication information of preserving in advance to the PSTN simulation services application server, accomplish the execution mode of the calling of hot line service to trigger the PSTN simulation services application server.
Fig. 2 is the schematic flow sheet of the preferred embodiment four of the implementation method of hot line service in the IP Multimedia System of the present invention; May further comprise the steps: in step 10; AGCF equipment is after user registration success; Send subscribe message to the PSTN simulation services application server; The hot line service that is used to subscribe to this user is handled indication information, and this hot line service is handled indication information and comprised and be used to indicate whether the information that reports the information of off-hook event and be used to indicate whether the report of user dialing information; Then in step 20; The PSTN simulation services application server monitoring this user open hot line service and receive business datum after or after upgrading this user's business datum; To AGCF equipment dispatch order message, and in this notification message, comprise said hot line service processing indication information; In step 30, after AGCF equipment is received said notification message, said hot line service is handled indication information preserve subsequently as said indication information; Then in step 40; The AGCF monitoring of equipment after user's off-hook information, according to preserve in advance, from the indication information that the PSTN simulation services application server obtains, judge whether to report off-hook event; Be execution in step 60 then, otherwise execution in step 50; In step 50, the subscriber dialing of AGCF device wait and carry out call flows general in the prior art after finish; In step 60, AGCF equipment reports off-hook event to the PSTN simulation services application server; In step 70, AGCF equipment judges whether the report of user dialing information according to said indication information then, if report of user dialing information then finish not, if report of user dialing information then execution in step 80; In step 80, whether AGCF equipment judges dialled in the preset time interval then, if dial then execution in step 90, if dialing does not finish; In step 90, AGCF equipment comprises the called number that the user dials to PSTN simulation services application server report of user dialing information in the said subscriber dialing information subsequently.
Pass through aforesaid operations; AGCF equipment is according to the indication information of preserving in advance; After monitoring user's off-hook information, relevant information is sent to the PSTN simulation services application server, accomplish the calling of hot line service by the PSTN simulation services application server.Come further to set forth the flow process that the completion of PSTN simulation services application server is called out in this preferred embodiment four through explanation below to Fig. 3.
Referring to Fig. 3; Another schematic flow sheet for the preferred embodiment four of the implementation method of hot line service in the IP Multimedia System of the present invention; In step 100, after the PSTN simulation services application server is received off-hook event, judge according to the hot line service data of user preset whether this user's business is that instant hot line is professional; Be execution in step 103 then, otherwise execution in step 101; In step 101, the PSTN simulation services application server judges in the preset time interval, whether to receive the subscriber dialing information that said AGCF equipment sends, if receive then execution in step 102, if do not receive then execution in step 103; In step 102, the called number that the PSTN simulation services application server comprises in said subscriber dialing information makes a call; In step 103, the PSTN simulation services application server makes a call to the called number of user preset.
In this preferred embodiment four; The PSTN simulation services application server is through sending the notification message that comprises hot line service processing indication information to AGCF equipment; Make AGCF equipment to handle the information that is used to indicate whether to report off-hook event that comprises in the indication information according to hot line service; After monitoring user's off-hook information through reporting off-hook event to the PSTN simulation services application server, thereby make the PSTN simulation services application server can carry out follow-up hot line service logic.
It should be noted last that: above embodiment is only in order to explaining technical scheme of the present invention, but not the present invention is made restrictive sense.Although the present invention is specified with reference to above-mentioned preferred embodiment; Those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and this modification or be equal to spirit and the scope that replacement does not break away from technical scheme of the present invention.
Claims (10)
1. the implementation method of hot line service in the IP Multimedia System; It is characterized in that; Comprise: the AGCF monitoring of equipment is after user's off-hook information; According to the indication information of preserving in advance after obtaining from the PSTN simulation services application server, accomplish the calling of hot line service, specifically comprise:
Said AGCF equipment judges whether the user dials in the preset time interval, if dialing then make a call to the number that the user dialled, if would not do not dial then the called number that in said indication information, comprises makes a call.
2. method according to claim 1 is characterized in that, before user's off-hook information, also comprises that said AGCF equipment preserves the operation of said indication information in advance at said AGCF monitoring of equipment, specifically comprises:
Said PSTN simulation services application server monitor the user open hot line service and receive business datum after or after upgrading user's business datum; To said AGCF equipment dispatch order message, and in this notification message, comprise this user's of preservation hot line service configuration information in advance;
After said AGCF equipment is received said notification message, said hot line service configuration information is preserved as said indication information.
3. method according to claim 2; It is characterized in that; At said PSTN simulation services application server before said AGCF equipment dispatch order message; Also comprise: said AGCF equipment is after user registration success; Send subscribe message to said PSTN simulation services application server, be used to subscribe to this user's hot line service configuration information, said hot line service configuration information comprises the called number of user preset and is used to indicate whether this user's business is the professional information of instant hot line.
4. method according to claim 1; It is characterized in that: before said AGCF equipment judges whether the user dials in the preset time interval; At first judge according to said indication information whether this user's business is that instant hot line is professional; Be that the called number that then in said indication information, comprises immediately makes a call, otherwise judge whether the user dials in the preset time interval.
5. according to claim 2 or 3 described methods, it is characterized in that: the hot line service configuration information that said PSTN simulation services application server comprises in the notification message that said AGCF equipment sends also comprises being used to indicate the user whether to cancel the information of hot line service.
6. method according to claim 5; It is characterized in that: whether said AGCF equipment at first cancels hot line service according to said indication information judges; Be then to wait for subscriber dialing and carry out the generalized calls handling process; Otherwise whether the business of judging this user according to said indication information is that instant hot line is professional, is that the called number that then in said indication information, comprises immediately makes a call, otherwise judges whether the user dials in the preset time interval.
7. the implementation method of hot line service in the IP Multimedia System; It is characterized in that; Comprise: the AGCF monitoring of equipment is after user's off-hook information; According to the indication information of preserving in advance after obtaining from the PSTN simulation services application server, notify said PSTN simulation services application server to accomplish the calling of hot line service, specifically comprise:
Said AGCF equipment judges whether to report off-hook event according to said indication information, if report off-hook event then report off-hook event to said PSTN simulation services application server; If do not report off-hook event then wait for subscriber dialing and carry out general call flows;
Wherein, Said AGCF equipment is after reporting off-hook event to said PSTN simulation services application server; Operation below also carrying out: said AGCF equipment judges whether the report of user dialing information according to said indication information; If report of user dialing information then finish not is if whether report of user dialing information then judges dialled in the preset time interval, if subscriber dialing then to PSTN simulation services application server report of user dialing information; Comprise the called number that the user dials in the said subscriber dialing information, do not finish if the user dials;
After said PSTN simulation services application server is received off-hook event; Whether judgement receives the subscriber dialing information that said AGCF equipment sends in the preset time interval; If the called number of receiving then in said subscriber dialing information, comprising makes a call, if do not receive then make a call to the called number of user preset.
8. method according to claim 7 is characterized in that, before user's off-hook information, also comprises that said AGCF equipment preserves the operation of said indication information in advance at said AGCF monitoring of equipment, specifically comprises:
Said PSTN simulation services application server monitor the user open hot line service and receive business datum after or after upgrading user's business datum; To said AGCF equipment dispatch order message, and in this notification message, comprise the hot line service processing indication information of preserving in advance;
After said AGCF equipment is received said notification message, said hot line service is handled indication information preserve as said indication information.
9. method according to claim 8; It is characterized in that; At said PSTN simulation services application server before said AGCF equipment dispatch order message; Also comprise: said AGCF equipment is after user registration success; Send subscribe message to said PSTN simulation services application server, the hot line service that is used to subscribe to this user is handled indication information, and this hot line service is handled indication information and comprised and be used to indicate whether the information that reports the information of off-hook event and be used to indicate whether the report of user dialing information.
10. method according to claim 7; It is characterized in that; Judge before the subscriber dialing information of in the preset time interval, whether receiving said AGCF equipment transmission at said PSTN simulation services application server; At first judge according to the hot line service data of user preset whether this user's business is that instant hot line is professional; Be then to make a call, otherwise judge in the preset time interval, whether to receive the subscriber dialing information that said AGCF equipment sends to the called number of user preset.
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| CN2006101698675A CN101212521B (en) | 2006-12-29 | 2006-12-29 | Method for implementing hotline service in IP multimedia subsystem |
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| CN102045694B (en) * | 2009-10-26 | 2015-08-12 | 中兴通讯股份有限公司 | The transmission method of user service information and network element device |
| CN113079351B (en) * | 2021-03-23 | 2022-06-07 | 无锡耘林大数据科技有限公司 | Data gateway, video monitoring time calibration method and monitoring system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1018844A1 (en) * | 1999-01-08 | 2000-07-12 | TELEFONAKTIEBOLAGET L M ERICSSON (publ) | Communication network |
| CN1268839A (en) * | 2000-04-07 | 2000-10-04 | 黎宁 | Automatic alarm method for dialling-free telephone |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1018844A1 (en) * | 1999-01-08 | 2000-07-12 | TELEFONAKTIEBOLAGET L M ERICSSON (publ) | Communication network |
| CN1268839A (en) * | 2000-04-07 | 2000-10-04 | 黎宁 | Automatic alarm method for dialling-free telephone |
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