CN101340614A - Customer number changing prompt method and apparatus in mobile communication system - Google Patents
Customer number changing prompt method and apparatus in mobile communication system Download PDFInfo
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Abstract
The invention discloses a method for notifying that a user changes a number in a mobile communication system and a device thereof. The method comprises the steps that: the number changing information of the user is stored in a home location register; a calling user initiates a call, and a called number is the number of the user before being changed; a gateway mobile switching center in which the called number is located is called; the gateway mobile switching center sends a routing information inquiring request of the called number to the home location register; the home location register forms a routing inquiring failure response according to the number changing information; a number after being changed and a number change processing manner are carried by the routing inquiring failure response; the routing inquiring failure response is sent to the gateway mobile switching center; the gateway mobile switching center notifies the calling user on the number after being changed of the called number according to the number change processing manner. The method and the device of the invention slightly change the current mobile communication system and have few influences, good compatibility, few signaling exchange times, low signaling load and high processing efficiency.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to the method and the device that user's number of changing is notified of a kind of GSM of being applicable to, WCDMA or TD-SCDMA network system.
Background technology
The changed number notification service of mobile communication system is after the called subscriber has changed telephone number, can be with the number record before and after changing in database.When before calling user dials called subscriber's the change during number, number after the change of number correspondence before this change will be retrieved by system, with the mode subscriber call of phonetic synthesis.Perhaps only point out the calling subscriber, this called subscriber's number is changed.
See also application number and be 03147311.3 Chinese invention patent, be the most approaching prior art of the application, it discloses following scheme, sees also shown in Figure 1.
Step 101, calling subscriber a calls out number m before the called subscriber b number of changing, go into to call for the GMSC (gateway mobile switching center) of asking the home network of delivering to this number m (Gateway Mobile Switching Center, GMSC).
Step 102, (Home Location Register, HLR) initiation is at the position enquiring request of this number m to attaching position register for GMSC.Being GMSC sends location request message LocReq to HLR, comprises number m before the number of changing in this message.
Step 103, store called subscriber's the number of changing information among the HLR, after receiving the position enquiring request, HLR will be according to number m before the called subscriber's number of changing among the location request message LocReq, inquire this called subscriber b number of changing and the subscriber call number of changing of having contracted after the business of new digit n, then construct voice script, send remote subscriber operational order message RUIDIR to GMSC, comprise playback script EXESCR, recorded announcement list parameter ANNLIST, digit collection Control Parameter DGTCC in the message.
Step 104, GMSC receives remote subscriber operational order message RUIDIR, then plays verbal announcement to calling subscriber a, content of announcement comprises: the called subscriber b number of changing, and the new digit after the number of changing.
Step 105 after GMSC execution broadcast verbal announcement is finished, is replied remote subscriber operational order message RUIDIR, report executing result to HLR.
Step 106, HLR replys location request message to GMSC, notice GMSC terminated call.
Far-end operation instruction message (RUIDIR) message that said method adopts is mainly the needs that adapt to code division multiple access (CDMA) system and adopts.But the changed number notification scheme for mobile communication system such as GSM, WCDMA or TD-SCDMA then needs additionally to increase this off-gauge far-end operation instruction message (RUIDIR) message, changes bigger to normal process.So visible such scheme compatibility is not high.On the other hand, said method need carry out Signalling exchange repeatedly between MSC and HLR, thereby signaling traffic load is heavier, and treatment effeciency is lower.
Summary of the invention
Problem to be solved by this invention is, the method and the device of subscriber number change notification in a kind of mobile communication system are provided, being compatible with various communication systems, system are changed and influences less, and the signaling interaction times between reduction GMSC and the HLR, improve treatment effeciency.
The invention discloses the method for subscriber number change notification in a kind of mobile communication system, described mobile communication system comprises GMSC (gateway mobile switching center), attaching position register, and described method comprises the steps:
Store user's the number of changing information in the described attaching position register, the described number of changing information comprises the preceding number of change, change back number, whether subscriber call is changed the back number information, and the number of changing processing mode;
The calling subscriber makes a call, and called number is the preceding number of a described user change, and described calling connects the GMSC (gateway mobile switching center) of described called number ownership;
Described GMSC (gateway mobile switching center) is sent the route information query request of described called number to described attaching position register;
Described attaching position register is according to the described number of changing information, structure routing inquiry failure response, in described routing inquiry failure response, carry described change back number and the described number of changing processing mode, send described routing inquiry failure response to described GMSC (gateway mobile switching center);
Described GMSC (gateway mobile switching center) is notified number after the number of changing of the described called number of described calling subscriber according to the described number of changing processing mode.
The described number of changing processing mode comprises:
Number after the automatic calling number of changing behind verbal announcement calling subscriber, SMS notification calling subscriber or the verbal announcement calling subscriber.
Described method further comprises:
Utilize the protocol extension field of the failure cause additional information in the described routing inquiry failure response, carry number and the described number of changing processing mode after the described change.
Described method further comprises:
If the described number of changing processing mode is the verbal announcement calling subscriber, described GMSC (gateway mobile switching center) structure playback script is play verbal announcement to described calling subscriber, and the content of described verbal announcement comprises: described called subscriber is number after the number of changing and the number of changing.
Described method further comprises:
If the described number of changing processing mode is automatically to call out number after the number of changing behind the verbal announcement calling subscriber, described GMSC (gateway mobile switching center) structure playback script, play verbal announcement to described calling subscriber, and initiate changing the calling of back number, the content of described verbal announcement comprises: described called subscriber is number after the number of changing and the number of changing.
Described method further comprises:
If the described number of changing processing mode is the SMS notification calling subscriber, described GMSC (gateway mobile switching center) is constructed a note and is sent described calling subscriber, and the content of described note comprises; Described called subscriber is number after the number of changing and the number of changing.
The invention also discloses the device of subscriber number change notification in a kind of mobile communication system, described mobile communication system comprises GMSC (gateway mobile switching center), attaching position register, and described device comprises:
One memory module is arranged at attaching position register, stores user's the number of changing information, and the described number of changing information comprises the preceding number of change, change back number, whether subscriber call is changed the back number information, and the number of changing processing mode;
One route information query request module is arranged at GMSC (gateway mobile switching center), is used for after receiving the calling that the calling subscriber initiates, and the attaching position register of the network of called number ownership is sent route information query request at described called number;
One inquiry response module, be arranged at attaching position register, after receiving described route information query request, according to the described number of the changing information in the described memory module, structure routing inquiry failure response, in described routing inquiry failure response, carry described change back number and the described number of changing processing mode, send described routing inquiry failure response to described GMSC (gateway mobile switching center);
The number of changing processing module is arranged at GMSC (gateway mobile switching center), is used for notifying number after the number of changing of the described called number of described calling subscriber according to the described number of the changing processing mode of described routing inquiry failure response.
Described inquiry response module is utilized the protocol extension field of the failure cause additional information in the described routing inquiry failure response, carries number and the described number of changing processing mode after the described change.
The invention also discloses a kind of mobile communication system of utilizing the realization subscriber number change notification of described method, comprise the device of subscriber number change notification in GMSC (gateway mobile switching center), attaching position register and a kind of mobile communication system, described device comprises:
One memory module is arranged at attaching position register, stores user's the number of changing information, and the described number of changing information comprises the preceding number of change, change back number, whether subscriber call is changed the back number information, and the number of changing processing mode;
One route information query request module is arranged at GMSC (gateway mobile switching center), is used for after receiving the calling that the calling subscriber initiates, and the attaching position register of the network of called number ownership is sent route information query request at described called number;
One inquiry response module, be arranged at attaching position register, after receiving described route information query request, according to the described number of the changing information in the described memory module, structure routing inquiry failure response, in described routing inquiry failure response, carry described change back number and the described number of changing processing mode, send described routing inquiry failure response to described GMSC (gateway mobile switching center);
The number of changing processing module is arranged at GMSC (gateway mobile switching center), is used for notifying number after the number of changing of the described called number of described calling subscriber according to the described number of the changing processing mode of described routing inquiry failure response.
Described inquiry response module is utilized the protocol extension field of the failure cause additional information in the described routing inquiry failure response, carries number and the described number of changing processing mode after the described change.
The present invention possesses following technique effect:
Extended field in the existing mobile communication standard agreement of HLR utilization transmits the number of changing information to GMSC, realizes the changed number notification business, and is little to existing mobile communication system change, influences little, compatible good.Simultaneously, signaling interaction times is few between HLR and the GMSC, and signaling traffic load is low, the treatment effeciency height.And, utilize protocol extension field in the inquiry routing iinformation failure response message, can further increase other relevant parameter of changed number notification business, can expand the function of changed number notification business neatly.
Description of drawings
Fig. 1 is the realization flow figure of the changed number notification of prior art;
Fig. 2 realizes the system construction drawing of the changed number notification function in the mobile communication system for the present invention;
Fig. 3 is the system flow chart of changed number notification function in the realization mobile communication system of the present invention;
Fig. 4 is the structural representation of the device of subscriber number change notification in the mobile communication system of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Figure 2 shows that the present invention realizes the system construction drawing of the changed number notification function in the mobile communication system.Wherein, calling subscriber a, label 201, it is linked in the communication network 202 by making a call.This calling subscriber a can be moving or fixing user terminal of Home Network or outer net.This communication network 202 is the mobile network's at called subscriber place a access network.This communication network 202 is connected with GMSC203.This GMSC203 is the server control appliance, is the control centre that realizes user call proceeding, calls out basic functions such as control and business realizing.This GMSC203 is connected with HLR204.HLR204 is an attaching position register, is the central database of system, user's relevant information under storing, wherein comprised the essential information the when user opens an account, and the business information of user's miscellaneous service of contracting, in the present invention, HLR stores user's the number of changing information especially.This HLR204 also is responsible for handling the routing inquiry request of GMSC203, returns the routing inquiry result.
(Visit Mobile SwitchingCenter, VMSC) 205 connect with Visited Mobile Switching Center respectively for GMSC203 and HLR204.VMSC is the current mobile switching centre that roams into of calling subscriber, is used to handle call flow.VMSC is connected with base station sub-system BSS206, BSS be responsible for and customer mobile terminal between the foundation of radio channel and the wireless transmission of data.Called subscriber b is connected with BSS by wave point.
Whether this called subscriber is as changing number, and then the information of the number of changing in HLR comprises: number m before the number of changing, number n after the number of changing, number n and the number of changing processing mode after the subscriber call number of changing.This number of changing processing mode can for example be number n after automatic calling called subscriber's the number of changing behind verbal announcement calling subscriber, SMS notification calling subscriber or the verbal announcement calling subscriber.Below with the called subscriber b number of changing, and the information of the number of changing in HLR is: the number m before the number of changing, the number n after the number of changing, number n after the subscriber call number of changing, processing mode is that verbal announcement is an example, and detailed process of the present invention is described.
Figure 3 shows that the system flow chart of changed number notification function in the realization mobile communication system of the present invention.
Step 301, number m before the number of changing of calling subscriber a calling called subscriber b goes into to call for to ask the GMSC203 that is sent to the home network of called subscriber b by communication network 202.
Step 302, the route information query request of GMSC number m before the HLR204 of called subscriber b ownership sends at called subscriber's number of changing.
Step 303, HLR receives this routing inquiry request, CAMEL-Subscription-Information to this called subscriber b is inquired about, learn called subscriber b number of changing and the signatory business of notifying current new digit n, the number of changing processing mode is verbal announcement, then according to the number of changing processing mode structure route information query failure response, adding failure cause is " changed number ", and number n and the number of changing processing mode after in the protocol extension field of the failure cause additional information of this response, carrying the called subscriber b number of changing, send this inquiry routing iinformation failure response to GMSC.
Because this route information query failure response is the message of stipulating in the standard agreement, thus applicable to plurality of communication systems such as GSM, WCDMA, TD-SCDMA, to system change and influence less, compatible height.
Step 304, GMSC receives inquiry routing iinformation failure response, judge failure cause, and according to number n structure playback script after failure cause, the number of changing processing mode and the called subscriber b number of changing, play verbal announcement according to this playback script to calling subscriber a, content of announcement comprises: b user's number of changing, and number n after the number of changing.
Be set at the situation of calling out this number n automatically behind the subscriber call number n for the number of the changing processing mode in the number of the changing information of HLR, GMSC finishes after the calling subscriber plays warning tone, the calling of n of initiating once more to check numbers, after in HLR, obtaining the positional information of number n, will connect by VMSC and BSS and called subscriber b.
Be set at SMS notification calling subscriber's situation for the number of the changing processing mode in the number of the changing information of HLR, GMSC is after receiving inquiry routing iinformation failure response, to inquire about after the number of changing of carrying in the routing iinformation failure response number and the number of changing processing mode is constructed a note according to this, its content comprises, call failure factor is user's number of changing, and number n after the explanation user number of changing.This note is sent to calling subscriber a.
The invention also discloses the device of subscriber number change notification in a kind of mobile communication system, be illustrated in figure 4 as the structural representation of the device of subscriber number change notification in the mobile communication system of the present invention.Described device promptly is used for carrying out the method for above-mentioned disclosed a kind of mobile communication system subscriber number change notification.
The device 40 of subscriber number change notification comprises six modules in the mobile communication system: memory module 401, inquiry response module 402, route information query request module 403, the number of changing processing module 404, calling module 405, SMS module 406.Wherein, memory module 401 and inquiry response module 402 are arranged in the attaching position register of mobile communication system, and route information query request module 403, the number of changing processing module 404, calling module 405 and SMS module 406 are arranged in the GMSC (gateway mobile switching center) of mobile communication system.
This memory module 401 is arranged at attaching position register, stores user's the number of changing information, and the described number of changing information comprises the preceding number of change, change back number, whether subscriber call is changed the back number information, and the number of changing processing mode.
This inquiry response module 402 is arranged at attaching position register, after receiving described route information query request, according to the described number of the changing information in the described memory module, structure routing inquiry failure response, in described routing inquiry failure response, carry described change back number and the described number of changing processing mode, send described routing inquiry failure response to described GMSC (gateway mobile switching center).
This route information query request module 403 is arranged at GMSC (gateway mobile switching center), is used for after receiving the calling that the calling subscriber initiates, and the attaching position register of the network of called number ownership is sent route information query request at described called number.
This number of changing processing module 404 is arranged at GMSC (gateway mobile switching center), is used for notifying number after the number of changing of the described called number of described calling subscriber according to the described number of the changing processing mode of described routing inquiry failure response.
Below with the called subscriber b number of changing, and the information of the number of changing in HLR is: the number m before the number of changing, the number n after the number of changing, number n after the subscriber call number of changing, processing mode is that verbal announcement is an example, and detailed process of the present invention is described.
Store user's the number of changing information in the memory module 401, comprising: number m before the number of changing, number n after the number of changing, whether number n and the number of changing processing mode after the subscriber call number of changing.This number of changing processing mode can for example be number n after automatic calling called subscriber's the number of changing behind verbal announcement calling subscriber, SMS notification calling subscriber or the verbal announcement calling subscriber.
Number m before calling subscriber a calls out the number of changing of called subscriber b, go into to call for ask be sent to the GMSC203 of home network of called subscriber b by communication network 202 after, the route information query request module 403 among the GMSC is sent route information query request at described number m to the attaching position register of the network of this called number m ownership.
After attaching position register is received this routing inquiry request, CAMEL-Subscription-Information by 402 couples of these called subscriber b of inquiry response module is inquired about, learn called subscriber b number of changing and the signatory business of notifying current new digit n, the number of changing processing mode is verbal announcement, then according to the number of changing processing mode structure route information query failure response, adding failure cause is " changed number ", and number n and the number of changing processing mode after in the protocol extension field of the failure cause additional information of this response, carrying the called subscriber b number of changing, send this inquiry routing iinformation failure response to GMSC.
GMSC receives inquiry routing iinformation failure response, judge failure cause by the number of changing processing module 404, and according to number n structure playback script after failure cause, the number of changing processing mode and the called subscriber b number of changing, play verbal announcement to calling subscriber a, content of announcement comprises: b user's number of changing, and number n after the number of changing.
Be set at the situation of calling out this number n automatically behind the subscriber call number n for the number of the changing processing mode in the number of the changing information of HLR, GMSC finishes after the calling subscriber plays warning tone, utilize calling module 405 calling of n of initiating once more to check numbers, after in HLR, obtaining the positional information of number n, will connect by VMSC and BSS and called subscriber b.
Be set at SMS notification calling subscriber's situation for the number of the changing processing mode in the number of the changing information of HLR, GMSC is after receiving inquiry routing iinformation failure response, number and the number of changing processing mode are constructed a note after utilizing SMS module 406 according to the number of changing of carrying in this inquiry routing iinformation failure response, its content comprises, call failure factor is user's number of changing, and number n after the explanation user number of changing.This note is sent to calling subscriber a.
Technical scheme of the present invention has following advantage:
Extended field in the existing mobile communication standard agreement of HLR utilization transmits the number of changing information to GMSC, realizes the changed number notification business, and is little to existing mobile communication system change, influences little, compatible good.
Signaling interaction times is few between HLR and the GMSC, and signaling traffic load is low, the treatment effeciency height.Prior art need to transmit 4 signalings between HLR and the GMSC, and the present invention only needs to transmit 2 signalings in order to realize the changed number notification business, and signaling interaction times is few; And only be to increase extended field on original standard signaling basics, signaling traffic load is low, the treatment effeciency height.
Further, utilize protocol extension field in the inquiry routing iinformation failure response message, can further increase other relevant parameter of changed number notification business, can expand the function of changed number notification business neatly.
Though the present invention discloses with aforesaid preferred embodiment, be not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention, the modification of being done all is included in the application's the scope.
Claims (10)
1, the method for subscriber number change notification in a kind of mobile communication system, described mobile communication system comprises GMSC (gateway mobile switching center), attaching position register, it is characterized in that, described method comprises the steps:
Store user's the number of changing information in the described attaching position register, the described number of changing information comprises the preceding number of change, change back number, whether subscriber call is changed the back number information, and the number of changing processing mode;
The calling subscriber makes a call, and called number is the preceding number of a described user change, and described calling connects the GMSC (gateway mobile switching center) of described called number ownership;
Described GMSC (gateway mobile switching center) is sent the route information query request of described called number to described attaching position register;
Described attaching position register is according to the described number of changing information, structure routing inquiry failure response, in described routing inquiry failure response, carry described change back number and the described number of changing processing mode, send described routing inquiry failure response to described GMSC (gateway mobile switching center);
Described GMSC (gateway mobile switching center) is notified number after the number of changing of the described called number of described calling subscriber according to the described number of changing processing mode.
2, the method for claim 1 is characterized in that, the described number of changing processing mode comprises:
Number after the automatic calling number of changing behind verbal announcement calling subscriber, SMS notification calling subscriber or the verbal announcement calling subscriber.
3, method as claimed in claim 1 or 2 is characterized in that, further comprises:
Utilize the protocol extension field of the failure cause additional information in the described routing inquiry failure response, carry number and the described number of changing processing mode after the described change.
4, method as claimed in claim 2 is characterized in that, further comprises:
If the described number of changing processing mode is the verbal announcement calling subscriber, described GMSC (gateway mobile switching center) structure playback script is play verbal announcement to described calling subscriber, and the content of described verbal announcement comprises: described called subscriber is number after the number of changing and the number of changing.
5, method as claimed in claim 2 is characterized in that, further comprises:
If the described number of changing processing mode is automatically to call out number after the number of changing behind the verbal announcement calling subscriber, described GMSC (gateway mobile switching center) structure playback script, play verbal announcement to described calling subscriber, and initiate changing the calling of back number, the content of described verbal announcement comprises: described called subscriber is number after the number of changing and the number of changing.
6, method as claimed in claim 2 is characterized in that, further comprises:
If the described number of changing processing mode is the SMS notification calling subscriber, described GMSC (gateway mobile switching center) is constructed a note and is sent described calling subscriber, and the content of described note comprises; Described called subscriber is number after the number of changing and the number of changing.
7, the device of subscriber number change notification in a kind of mobile communication system, described mobile communication system comprises GMSC (gateway mobile switching center), attaching position register, it is characterized in that, described device comprises:
One memory module is arranged at attaching position register, stores user's the number of changing information, and the described number of changing information comprises the preceding number of change, change back number, whether subscriber call is changed the back number information, and the number of changing processing mode;
One route information query request module is arranged at GMSC (gateway mobile switching center), is used for after receiving the calling that the calling subscriber initiates, and the attaching position register of the network of called number ownership is sent route information query request at described called number;
One inquiry response module, be arranged at attaching position register, after receiving described route information query request, according to the described number of the changing information in the described memory module, structure routing inquiry failure response, in described routing inquiry failure response, carry described change back number and the described number of changing processing mode, send described routing inquiry failure response to described GMSC (gateway mobile switching center);
The number of changing processing module is arranged at GMSC (gateway mobile switching center), is used for notifying number after the number of changing of the described called number of described calling subscriber according to the described number of the changing processing mode of described routing inquiry failure response.
8, device as claimed in claim 7 is characterized in that,
Described inquiry response module is utilized the protocol extension field of the failure cause additional information in the described routing inquiry failure response, carries number and the described number of changing processing mode after the described change.
9, a kind of mobile communication system of utilizing as the realization subscriber number change notification of method as described in the claim 1,2,4,5 or 6, the device that comprises subscriber number change notification in GMSC (gateway mobile switching center), attaching position register and a kind of mobile communication system, it is characterized in that described device comprises:
One memory module is arranged at attaching position register, stores user's the number of changing information, and the described number of changing information comprises the preceding number of change, change back number, whether subscriber call is changed the back number information, and the number of changing processing mode;
One route information query request module is arranged at GMSC (gateway mobile switching center), is used for after receiving the calling that the calling subscriber initiates, and the attaching position register of the network of called number ownership is sent route information query request at described called number;
One inquiry response module, be arranged at attaching position register, after receiving described route information query request, according to the described number of the changing information in the described memory module, structure routing inquiry failure response, in described routing inquiry failure response, carry described change back number and the described number of changing processing mode, send described routing inquiry failure response to described GMSC (gateway mobile switching center);
The number of changing processing module is arranged at GMSC (gateway mobile switching center), is used for notifying number after the number of changing of the described called number of described calling subscriber according to the described number of the changing processing mode of described routing inquiry failure response.
10, system as claimed in claim 9 is characterized in that,
Described inquiry response module is utilized the protocol extension field of the failure cause additional information in the described routing inquiry failure response, carries number and the described number of changing processing mode after the described change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101182257A CN101340614A (en) | 2007-07-02 | 2007-07-02 | Customer number changing prompt method and apparatus in mobile communication system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101182257A CN101340614A (en) | 2007-07-02 | 2007-07-02 | Customer number changing prompt method and apparatus in mobile communication system |
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| CNA2007101182257A Pending CN101340614A (en) | 2007-07-02 | 2007-07-02 | Customer number changing prompt method and apparatus in mobile communication system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707728B (en) * | 2009-10-27 | 2012-06-06 | 东方通信股份有限公司 | Number changing notification system and realization method by monitoring signaling based on intelligent network |
| WO2012088864A1 (en) * | 2010-12-27 | 2012-07-05 | 中兴通讯股份有限公司 | Method and system for routing data message |
| CN112165555A (en) * | 2020-09-28 | 2021-01-01 | 上海掌门科技有限公司 | Calling method and device based on called party detection |
-
2007
- 2007-07-02 CN CNA2007101182257A patent/CN101340614A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707728B (en) * | 2009-10-27 | 2012-06-06 | 东方通信股份有限公司 | Number changing notification system and realization method by monitoring signaling based on intelligent network |
| WO2012088864A1 (en) * | 2010-12-27 | 2012-07-05 | 中兴通讯股份有限公司 | Method and system for routing data message |
| CN102572999A (en) * | 2010-12-27 | 2012-07-11 | 中兴通讯股份有限公司 | Data message routing method and system |
| CN102572999B (en) * | 2010-12-27 | 2016-07-06 | 中兴通讯股份有限公司 | A kind of method and system of data message route |
| CN112165555A (en) * | 2020-09-28 | 2021-01-01 | 上海掌门科技有限公司 | Calling method and device based on called party detection |
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