WO2009129711A1 - 呼叫前转的方法、设备及系统 - Google Patents

呼叫前转的方法、设备及系统 Download PDF

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Publication number
WO2009129711A1
WO2009129711A1 PCT/CN2009/070843 CN2009070843W WO2009129711A1 WO 2009129711 A1 WO2009129711 A1 WO 2009129711A1 CN 2009070843 W CN2009070843 W CN 2009070843W WO 2009129711 A1 WO2009129711 A1 WO 2009129711A1
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WO
WIPO (PCT)
Prior art keywords
called user
call
entity
user
monitoring
Prior art date
Application number
PCT/CN2009/070843
Other languages
English (en)
French (fr)
Inventor
伍勇
梁静
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP09158700.6A priority Critical patent/EP2112843B1/en
Publication of WO2009129711A1 publication Critical patent/WO2009129711A1/zh
Priority to ZA2010/08137A priority patent/ZA201008137B/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/54—Arrangements for diverting calls for one subscriber to another predetermined subscriber
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold

Definitions

  • the present invention relates to communication systems, and more particularly to a method, device and system for call forwarding.
  • HLR home location register
  • MSC mobile Switching Center
  • VLR visitor location register
  • VMSC visited mobile switching center
  • the relevant information of the service is recorded in the HLR of the user's location. For example, when the called user is busy, no answer, no service area, etc., the call forwarding occurs. If the called user sets the call forwarding number to be the voice mail address, video mail address or other available. The communication number will forward the call to the corresponding forwarding number. In the case of using voice mail or video mail as the forwarding number, the mailbox server usually records or records the call, and then the called user is notified by the short message. When the user is in the network registration area, the call forwarding will be completed by the MSC/HLR of the user's location. If the user is in the roaming state, the call forwarding will be completed by the VMSC/VLR of the user's roaming area.
  • the user information is registered in the VLR of the roaming area.
  • the VLR in the roaming area After receiving the registration of the user information, the VLR in the roaming area sends a location update message to the HLR of the user's home location.
  • the HLR of the user's home location records relevant information in the received location update message.
  • the HLR of the user's home location sends the service information requested by the user to the VLR of the roaming area.
  • One of the important information is the call forwarding service that the user applies for at the home HLR, which mainly includes the conditions for triggering call forwarding, and the call forwarding number.
  • the user acts as a called user, and the calling user initiates a call request to the user, and the MSC/HLR (or VMSC/VLR) that provides the service to the calling user requests the roaming number from the home HLR of the called user.
  • MSC/HLR or VMSC/VLR
  • the called party's HLR After receiving the requested roaming number of the calling user MSC, the called party's HLR requests the roaming number from the VMSC/VLR of the called user's roaming place, and returns a request to the calling user's MSC/HLR (or VMSC/VLR). The obtained roaming number of the called user.
  • the MSC/HLR (or VMSC/VLR) serving the calling user calls the called user according to the obtained roaming number, and at this time, the call is connected to the roaming place of the called user.
  • the called user If the called user is busy, does not answer, or is not in the service area, it will return a response to the VMSC/VLR of the called user's roaming place, where the response includes that the called user is busy, has no answer, or is not in the service area, and cannot establish a connection. Information.
  • the VMSC/VLR of the called user roaming connects the call request to the call forwarding number of the called user.
  • the current call forwarding is implemented by the HLR of the called user's home location and the VMSC/VLR of the current location of the called party.
  • the VLR obtains the customized service status from the HLR, and then when the user occurs as the called party, the VMSC forwards the calling call to the forwarding number.
  • ISUP ISDN User Part
  • Embodiments of the present invention provide a method, device, and system for call forwarding, so that when a roaming called user experiences call forwarding, part of the long distance cost can be saved.
  • a call forwarding method of a called user including:
  • the called user receiving the monitoring entity report cannot establish a connection event
  • the called subscriber forwards number is sent to the call originating entity; the call originating entity is notified to connect the call to the called subscriber forward number.
  • a call forwarding system of a called user comprising:
  • the monitoring entity is configured to report to the call forwarding control entity that the called user cannot establish a connection event; the call forwarding control entity is configured to send the called party to the call originating entity after the called user that receives the monitoring entity cannot establish a connection event The user forwards the number; and notifies the call originating entity to connect the call to the called user forwarding number.
  • a call forwarding control entity including:
  • a receiving unit configured to receive, by the calling entity, the monitored user report that the called user cannot establish a connection event
  • a sending unit configured to send, according to the received called user, a connection event, to the call originating entity, the called user forwarding number, and notify the call initiating entity to connect the call to the called user forwarding number.
  • a network device including:
  • a receiving unit configured to receive a connection event that the called user cannot establish, and is configured to receive a forwarded number of the called user sent by the call forwarding control entity;
  • the sending unit is configured to send the called user unable to establish a connection event to the call forwarding control entity, and the call initiating unit is configured to request a call connection to the called user forwarding number.
  • a receiving unit configured to receive, from the call originating entity, that the called user cannot establish a connection event, and is configured to receive a called user forwarding number sent by the call forwarding control entity;
  • a sending unit configured to send the called user unable to establish a connection event to the call forwarding control entity, and configured to send the called user forwarding number to the call originating entity, so that the call originating entity connects the call to the location
  • the called user calls the forwarding number.
  • the monitoring entity discovers the state, it reports to the call forwarding control entity, and controls the call through the call forwarding control entity.
  • the initiating entity directly connects the call to the forwarded number of the called user. It can be seen that the embodiment of the present invention avoids the call forwarding connection to the called user by the visited mobile switching center at the location of the called user.
  • the embodiment of the present invention is applied to the call forwarding in which the called user is in the roaming state, the long-distance fee from the call to the mobile switching center to the forwarded number of the called user will be saved, especially when the user is roaming abroad, the saving will be saved. Expensive international long distance charges.
  • the call forwarding provided by the HLR in the prior art is replaced by the solution of the embodiment of the present invention, thereby reducing the cost of forwarding.
  • FIG. 2 is a flowchart of a call forwarding method of a called user in Embodiment 1 of the present invention
  • FIG. 3 is a block diagram of the call forwarding system corresponding to Figure 2;
  • FIG. 4 is a block diagram of a call forwarding control entity in Embodiment 1 of the present invention.
  • FIG. 5 is a block diagram of a call originating entity in Embodiment 1 of the present invention.
  • FIG. 6 is a flowchart of a call forwarding method of a called user in Embodiment 2 of the present invention.
  • FIG. 7 is a flowchart of a call forwarding method of a called user in Embodiment 3 of the present invention.
  • FIG. 8 is a flowchart of another call forwarding method of a called user according to Embodiment 3 of the present invention.
  • the call originating entity that controls the calling user connects the call to the forwarded number of the called user, thereby implementing call forwarding and avoiding the location of the called user.
  • the call forwarding from the calling side to the forwarding number is implemented by using the embodiment of the present invention, which will save the long distance charge from the visiting mobile switching center to the forwarded number of the called user.
  • the above call originating entity control for the calling user can be through the intelligent network (IN, Intelligent
  • CS domain circuit domain
  • PSTN Public Switched Telephone Network
  • GSM Global System for Mobile Communications
  • WCDMA IN provides services in core communication networks such as wideband code division multiple access
  • CDMA code division multiple access
  • the user subscription information (CSI, Camel Subscriber Information) of the intelligent service needs to be pre-registered in the HLR of the user B.
  • the specific process of providing the service through the IN is as follows:
  • the MSC of the calling user obtains the CSI data from the HLR of the user B, and learns that the user B applies for the intelligent network service.
  • the MSC of the calling user follows the IN call processing procedure, that is, the service to which the user B belongs.
  • the control point (SCP) sends an initial detection point (IDP, Initial DP) message, triggering the call flow to the intelligent network; thus establishing a control relationship between the calling user MSC and the IN.
  • IDP initial detection point
  • the information that the called user cannot establish the connection may be transmitted to the calling user's MSC, and the calling party The user's MSC picks up the IN, and subsequent calls can be processed under the IN control.
  • the method of triggering the IN service in the actual application is not limited to the above-mentioned triggering by means of CSI, and other triggering methods may also be used, for example: triggering by the GMSC (Mobile Network Gateway Office), and the specific triggering application is described in the embodiment.
  • GMSC Mobile Network Gateway Office
  • This embodiment discloses a call forwarding method of a called user. As shown in FIG. 2, the method specifically includes the following steps:
  • the called mobile terminal After the call originating entity of the calling user receives the called user's visit, the called mobile terminal returns that the called user cannot establish a connection event, and the monitoring entity monitors that the called user cannot establish a connection event, and the monitoring The entity reports that the called user cannot establish a connection event to the intelligent network;
  • the intelligent network sends the called user forwarding number to the call originating entity according to the received call user failing to establish a connection event;
  • the intelligent network notifies the call originating entity to connect the call to the forwarded number of the called user.
  • the embodiment further provides a call forwarding system of the called user.
  • the system includes: a call originating entity 31 located at the location of the calling user, A monitoring entity 33 to monitor, and a call forwarding control entity 32 for controlling call forwarding.
  • the monitoring entity 33 can monitor that the called user cannot establish a connection event, and the monitoring is performed.
  • Entity 33 reports to call forwarding control entity 32 that the called user is unable to establish a connection event. After receiving the connection event, the call forwarding control entity 32 sends the called user forward number to the call originating entity 31; and notifies the call originating entity 31 to connect the call to the called user. number.
  • the call forwarding control entity includes: a receiving unit 41 and a transmitting unit 42. If the call originating entity of the calling user receives the visited mobile switching center of the called user, and the returned called user cannot establish a connection event, the call originating entity reports the called user unable to establish a connection event to the controlling entity; After receiving the connection event, the receiving unit 41 in the control entity sends the called user forwarding number to the call originating entity through the sending unit 42 and notifies the call originating entity to connect the call to the location. The called user forwards the number.
  • the embodiment further provides a network device, including: a receiving unit 51, a sending unit 52, and a call initiating unit 53.
  • the receiving unit 51 can receive the connected user from the called mobile switching center of the called user and cannot establish a connection event; and send the called user unable to establish a connection event to the call forwarding control entity through the sending unit 52.
  • the call forwarding control entity After receiving the connection event, the call forwarding control entity sends the called user forward number to the call originating entity.
  • the call originating entity After receiving the forwarded number of the called user through the receiving unit 51, the call originating entity passes the call originating unit. 53 requests the call connection from the called subscriber forwarding number.
  • the network device shown in FIG. 5 may be a mobile switching center or a mobile network gateway office.
  • the embodiment further provides a monitoring entity, including a receiving unit and a sending unit, wherein the receiving unit receives, from the call originating entity, that the called user cannot establish a connection event; and then sends the called user unable to establish a connection event to the call forwarding through the sending unit.
  • Control entity At the same time, the receiving unit in this embodiment further receives the called user forwarding number sent by the call forwarding control entity; and then sends the called user forwarding number to the call originating entity through the sending unit, so as to facilitate the call.
  • the originating entity connects the call to the called subscriber call forwarding number.
  • the call forwarding entity after the call forwarding control entity receives the connection event that the called user cannot establish a connection, the call forwarding entity sends the called user forwarding number to the call originating entity, and controls to connect the current call to the called party.
  • User forwarded number Since the forwarded number is connected to the called user, it is not directly completed by the mobile switching center visited by the called user, but from the calling party.
  • the user's call originating entity directly connects the call to the forwarding number, thereby eliminating the long distance charge between the mobile switching center visited by the called user and the forwarding number. That is, the call forwarding scheme provided by the HLR in the prior art is replaced by the solution of the embodiment of the present invention described above, which reduces the cost of forwarding.
  • This embodiment is a specific implementation process of the call forwarding method of the called user when the call originating entity of the calling user and the monitoring entity are the mobile switching center, and the service control point (SCP) in the intelligent network is used in this embodiment. ) Implement call forwarding control.
  • the called user is first required to apply for the relevant intelligent network call forwarding service, so that the SCP provides the call forwarding service for the called user, where the set forwarding number is recorded in the SCP, and In the home location register of the called user, the T-CSI (terminating CSI) for the user to apply for the intelligent network call forwarding service is recorded.
  • the call forwarding method of the called user includes the following steps:
  • the calling user initiates a call to the called user.
  • the calling user may also be in a roaming state or may be in the home location of the calling user, so the calling user may pass through the mobile switching center (OMC) of the home location thereof.
  • OMC mobile switching center
  • the called user initiates a call, or may initiate a call to the called user through another network (such as a visited mobile switching center where it is roaming).
  • the situation is as follows: The calling user initiates a call to the called user through the OMSC at the home location.
  • the OMSC of the calling user initiates an SRI (Send Routing Information) operation to the HLR of the called user to request to initiate a call to the called user, or obtain a roaming number (MSRN) of the corresponding called user to be called to the called party through the MSRN.
  • SRI Send Routing Information
  • MSRN roaming number
  • the HLR of the called user returns to the OMSC of the calling user. T-CSI.
  • the OMSC of the calling user learns that the called user applies for the intelligent network service, so the call is processed through the intelligent network according to the T-CSI trigger, that is, to the intelligent network.
  • the SCP providing the service sends an initial monitoring point message (IDP).
  • the SCP After receiving the IDP message, the SCP starts to process the call, that is, sends a monitoring request to the OMSC, so as to monitor whether the OMSC receives the connected user cannot establish a connection event, and generally the called user is busy, has no answer, or is not in the service area.
  • the monitoring request in this embodiment is implemented by the RRBE (Request to Report Basic Call Status) message.
  • the SCP sends a call continuation indication to the OMSC, so that the OMSC continues the following call procedure.
  • the OMSC of the calling user again initiates an SRI (Send Routing Information) operation to the HLR of the called user, and obtains a roaming number (MSRN) of the corresponding called user to initiate a call to the called user through the MSRN.
  • SRI Send Routing Information
  • the HLR of the called user After receiving the current SRI, the HLR of the called user initiates a request for obtaining an MSR to the VMSC/VLR where the called user roams.
  • the VMSC/VLR returns a response to the HLR of the called user, and carries the MSRN of the called user.
  • the HLR of the called user in this step returns the MSRN of the called user to the OMSC of the calling user.
  • the OMSC of the calling user sends a call request to the VMSC/VLR according to the MSRN of the called user.
  • the VMSC/VLR After receiving the call request, the VMSC/VLR initiates a call request to the called user, and generally establishes a related connection when the called user answers, and processes according to the existing call flow.
  • the VMSC/VLR returns to the calling user's OMSC that the called user cannot establish a connection event, and disconnects the connection with the calling user's OMSC.
  • the SCP sends a monitoring request to the calling user OMSC to monitor that the called user cannot establish a connection event. Therefore, the calling user OMSC reports the called user cannot establish a connection through the basic call status event report (ERB, Event Report BCSM). Event, and suspend the call, waiting for instructions from the SCP.
  • ERP basic call status event report
  • BCSM Event Report BCSM
  • the SCP determines, according to the IDP information, that the called user has roamed, and cannot establish a connection with the called user, and needs to connect the current call to the forwarded number of the called user, and the forwarded call of the called user has been recorded in the SCP.
  • the number therefore, the SCP sends the forwarded number of the called subscriber to the calling subscriber OMSC, and instructs the calling subscriber OMSC to be connected to the forwarded number of the called subscriber by the call.
  • Said The forwarding number can be a voice mail box, a video mail box or other available number.
  • the called user sets a voice mail box (VM, Voice Mail).
  • the calling user OMSC connects the call to the forwarding number set by the called user, that is, the voice mail box, and the next recording process is completed by the OMSC and the voice mail.
  • the call forwarding of the called user is controlled by the SCP in the intelligent network, so that when the called user cannot establish a connection, the current call is directly connected to the forwarded number of the called user through the OMSC of the calling user. , such as voice mail, etc.
  • the processing amount of the loopback by the OMSC information network of the calling user is used.
  • the forwarding number is forwarded by the OMSC of the calling user.
  • the forwarding number is recorded in the SCP, and the OMSC can obtain the forwarding number through the SCP. Therefore, when the service is triggered by ISUP signaling, The secondary call can be connected to the forwarding number.
  • the user is required to apply for the call forwarding service through the intelligent network, and can be used for call forwarding when the called user is in the roaming state, including domestic roaming and foreign roaming.
  • This method of triggering the intelligent network control by the called user's T-CSI can effectively save the server-side service processing amount for the called user who applies for the service.
  • the embodiment is a specific implementation process of the call forwarding method of the called user when the call originating entity of the calling user and the monitoring entity are the mobile network gateway office, and the service control point in the intelligent network is used in this embodiment.
  • SCP Implements a call forwarding control entity. Since the call request received by the mobile network gateway office is sent according to the MSRN of the called user, the mobile network gateway office can determine that the current call belongs to the roaming call, and can directly transfer the current call to the SCP for control. When the user is unable to establish a connection, the long distance charge when the call is forwarded can be saved. As shown in Figure 7, the call forwarding method of the called user includes the following steps:
  • the calling user initiates a call to the called user.
  • the calling user may also be in a roaming state or may be in the home location of the calling user, so the calling user may pass through the mobile switching center (OMSC) of the home location thereof.
  • OMSC mobile switching center
  • the called user initiates a call, or may initiate a call to the called user through another network (such as a visited mobile switching center where it is roaming).
  • the situation is as follows: The calling user is at home. Ground, the call is initiated to the called user through the OMSC.
  • the OMSC of the calling user initiates an SRI (Send Routing Information) operation to the HLR of the called user to request to initiate a call to the called user, or obtain a roaming number (MSR) of the corresponding called user to be called to the called party through the MSRN.
  • SRI Send Routing Information
  • MSR roaming number
  • the called party's HLR After receiving the S1, the called party's HLR initiates a request for obtaining an MSR to the VMSC/VLR where the called user is roaming.
  • the VMSC/VLR returns a response to the HLR of the called user, and carries the MSRN of the called user.
  • the HLR of the called user returns the MSRN of the called user to the OMSC of the calling user.
  • the calling subscriber's OMSC initiates a call request to the mobile network gateway office (GMSC) through the MSRN.
  • GMSC mobile network gateway office
  • the intelligent network needs to control the current call, so the GMSC sends an initial detection point message (IDP) to the SCP of the intelligent network to trigger the SCP pair. Monitoring of this call.
  • IDDP initial detection point message
  • the SCP After receiving the IDP, the SCP starts to process the call, that is, directly sends a monitoring request to the GMSC, so as to monitor whether the GMSC receives the connection event that the called user cannot establish a connection. Generally, when the called user is busy, does not answer, or is not in the service area, the GMSC will receive that the called user cannot establish a connection event.
  • the monitoring request in this embodiment is implemented by the RRBE (Request to Report Basic Call Status) message.
  • the SCP sends a call continuation indication to the GMSC, so that the GMSC continues the following call procedure.
  • the GMSC initiates a call request to the VMS 7VLR according to the MSRN of the called user.
  • the VMSC/VLR After receiving the call request, the VMSC/VLR initiates a call request to the called user, and generally establishes a related connection when the called user answers, and processes according to the existing call flow. The state in which the called user is busy, not in the service area, or the called user does not answer, etc., cannot be established, and is processed according to the method of this embodiment.
  • the VMSC/VLR returns to the calling user's GMSC that the called user cannot establish a connection event, and disconnects the connection with the calling user's GMSC. 713.
  • the SCP sends a monitoring request to the GMSC to monitor that the called user cannot establish a connection event. Therefore, the GMSC reports the called user cannot establish a connection event through the basic call status event report (EBB), and suspends the call. , waiting for instructions from the SCP.
  • EBB basic call status event report
  • the SCP directly sends the forwarded number of the called user to the GMSC, and instructs the calling user GMSC to connect the forwarded number of the called user to the called party.
  • the forwarding number may be a voice mail box, a video mail box or other available number.
  • the called user sets a voice mail box (VM, Voice Mail).
  • the GMSC connects the call to the forwarding number set by the called user, that is, the voice mailbox, and the subsequent recording process is completed by the GMSC and the voice mail.
  • the embodiment of the present invention may specifically be:
  • the GMSC communicates with the SCP through the intermediate device, and the specific communication process is consistent with steps 701 to 706.
  • Subsequent processing steps 707 to 714 may be replaced by the flow shown in FIG. 8, which is specifically described as follows:
  • the GMSC After receiving the call request, the GMSC first sends an initial address message (IAM) in the intelligent network signaling to the intermediate device.
  • IAM initial address message
  • the intermediate device After receiving the IAM message, the intermediate device sends an IDP to the SCP according to the IAM message.
  • the SCP sends a monitoring request to the intermediate device, so that the intermediate device monitors whether the GMSC receives the connection event that the called user cannot establish a connection.
  • the monitoring request in this embodiment is implemented by the RRBE (Request to Report Basic Call Status) message.
  • the SCP sends a call continuation indication to the intermediate device.
  • the intermediate device forwards the call continuation indication to the GMSC, so that the GMSC continues the following call flow.
  • the GMSC initiates a call request to the VMSC/VLR according to the MSRN of the called user. 7. After receiving the call request, the VMSC/VLR initiates a call request to the called user, and generally establishes a related connection when the called user answers, and processes according to the existing call flow. The state in which the called user is busy, not in the service area, or the called user has no response, and the like cannot be established, is processed according to the method of this embodiment.
  • the VMSC/VLR is directed to the calling user because the called user cannot establish a connection.
  • the GMSC returns that the called user cannot establish a connection event and tears down the connection with the calling user's GMSC.
  • the SCP sends a monitoring request to the intermediate device to monitor that the called user cannot establish a connection event. Therefore, the GMSC reports to the intermediate device through the ERB that the called user cannot establish a connection event and suspends the call.
  • the intermediate device reports the event that the called user cannot establish a connection to the SCP through the ERB.
  • the SCP sends the forwarded number of the called user to the intermediate device, and sends an instruction to the intermediate device to instruct the calling user GMSC to connect the forwarded number of the called user to the called party.
  • the intermediate device forwards the forwarded number and the command of the called user to the GMSC.
  • the GMSC connects the call to the forwarded number set by the called user, that is, the voice mailbox, and the recorded recording process is completed by the GMSC and the voice mail.
  • the call forwarding of the called user is controlled by the SCP in the intelligent network, so that when the called user cannot establish a connection, the call is directly connected to the forwarded number of the called user through the GMSC of the calling user. , such as voice mail, etc. This can save the long-distance charges incurred when the VMSC roaming from the called user connects to the forwarding number.
  • the forwarding number is forwarded by the calling user's GMSC. Since the forwarding number is recorded in the SCP, and the GMSC can obtain the forwarding number through the SCP, the ISUP signaling or intelligent network signaling is used. When the service is triggered, the call can be connected to the forwarding number.
  • This embodiment can perform call forwarding when the called user is in a roaming state, including domestic roaming and foreign roaming.
  • the T-CSI is not used, but each call through the GMSC is controlled by the SCP, and the user does not need to apply for the call forwarding service, which brings more users. Convenience.
  • the embodiment provides a call forwarding system of a called user, including: a monitoring entity and a call forwarding control entity, wherein the monitoring entity reports to the call forwarding control entity that the called user cannot establish a connection event; the call forwarding control entity is After receiving the connection event that the called user cannot establish a connection, the call originating entity sends the called user forwarding number to the call originating entity; and notifies the call originating entity to connect the call to the called user forwarding number.
  • the above-mentioned monitoring entity should be able to report to the call forwarding control entity that the called user cannot establish a connection event, and the implementation needs to be set, specifically: sending a monitoring to the monitoring entity through the call forwarding control entity Controlling the request, requesting the monitoring entity to monitor that the called user cannot establish a connection event.
  • the monitoring entity and the call originating entity of the calling user may be implemented by the OMSC of the calling user; the OMSC receives the subscription information of the called user from the called user home location register, and according to The subscription information of the called user triggers the call forwarding control entity to send a monitoring request to the monitoring entity (ie, the mobile switching center of the calling user).
  • the OMSC serves as a call originating entity and a monitoring entity of the calling user, and mainly includes a receiving unit 51, a sending unit 52, and a call originating unit 53 as described in FIG. For a detailed description of each unit, refer to the description of FIG. 5 in Embodiment 1, and details are not described herein again.
  • the monitoring entity and the call originating entity of the calling user in this embodiment may be implemented by the calling subscriber's GMSC; the GMSC receives the roaming number of the called user from the calling subscriber mobile switching center, and triggers The call forwarding control entity sends a monitoring request to the monitoring entity (ie, the GMSC).
  • the GMSC serves as a call originating entity and a monitoring entity of the calling user, and mainly includes a receiving unit 51, a sending unit 52, and a call originating unit 53 as described in FIG.
  • a receiving unit 51 receives a call from the calling user
  • a sending unit 52 sends a call to the calling user
  • a call originating unit 53 receives a call from the calling user
  • FIG. 5 receives a call from a call originating entity and a monitoring entity of the calling user.
  • the call forwarding system of the called user in this embodiment may also be set up in the following manner: the call originating entity is implemented by the calling user's GMSC, and the monitoring entity is implemented by the intermediate device.
  • the GMSC is connected to the call forwarding control entity by using the intermediate device, and the GMSC triggers the call forwarding control entity to send a monitoring request to the intermediate device by using the intermediate device.
  • the call is controlled by the SCP.
  • the SCP is used as a call forwarding control entity.
  • the method includes: a receiving unit 41 and a sending unit 42.
  • the sending unit 42 needs to send a monitoring request to the call originating entity of the calling user in advance, and requests the call originating entity that monitors the calling user to receive the connected user cannot establish a connection event.
  • the call originating entity of the calling user receives the called user returning from the mobile switching center of the called user, the call originating entity automatically reports that the called user cannot establish a connection event to the controlling entity.
  • the receiving unit 41 in the control entity sends the called user forwarding number to the call originating entity through the sending unit 42 and controls the call originating entity to connect the call to the call originating entity.
  • the called user forwards the number.
  • the call forwarding control entity in this embodiment may also be implemented in other manners, for example: through a device having a corresponding function of the SCP.
  • the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
  • the essential solution software product of the present invention is stored in a readable storage medium, such as a floppy disk, a hard disk or an optical disk of a computer, and includes a plurality of instructions for making a device (which may be a server, or a network). Apparatus, etc.) performs the methods described in various embodiments of the present invention.

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Description

呼叫前转的方法、 设备及系统
本申请要求于 2008 年 4 月 25 日提交中国专利局、 申请号为 200810094003.0、 发明名称为"呼叫前转的方法、 设备及系统"的中国专利申请 的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信系统， 特别涉及呼叫前转的方法、 设备及系统。
背景技术
如果一个用户要和其他用户进行通信， 首先要在归属位置寄存器（HLR ) 中进行入网注册， 并进行相关业务的注册， 当需要为该用户提供通信服务时， 通过用户所在地的 MSC/HLR ( MSC: 移动交换中心）为用户提供服务。 当该 用户漫游到其他地区时， 则需要在其所漫游地区的拜访位置寄存器（VLR )中 进行用户信息登记， 则由其所漫游地区的 VMSC/VLR ( VMSC: 拜访移动交 换中心）来提供服务。
在一次呼叫过程中，如果被叫用户申请了相关的呼叫前转业务， 则会在用 户所在地的 HLR中记录该业务的相关信息。例如当被叫用户处于忙、无应答、 不在服务区等无法建立连接的状态下， 则会发生呼叫前转， 如果被叫用户设置 的呼叫前转号码为语音信箱地址、视频信箱地址或其他可用的通信号码， 则会 将本次呼叫前转到相应的前转号码。对于采用语音信箱或视频信箱作为前转号 码的情况，一般通过邮箱服务器为主叫录音或录像， 然后通过短消息通知被叫 用户。 当用户在其入网注册地区， 该呼叫前转将会由用户所在地的 MSC/HLR 完成，如果用户处于漫游状态，该呼叫前转将会由用户漫游地区的 VMSC/VLR 完成。
如图 1所示， 为一个移动用户漫游后， 作为被叫时， 产生呼叫前转的流程 图， 假定该移动用户设置了将呼叫前转到语音邮箱的业务， 该流程如下：
101、 用户到达漫游地区后， 在漫游地区的 VLR中进行用户信息的登记。
102、 漫游地区的 VLR接收用户信息的登记后， 向用户归属地的 HLR发 送位置更新消息。
103、 用户归属地的 HLR记录接收到的位置更新消息中的相关信息。
104、 用户归属地的 HLR将用户申请的业务信息发送到漫游地区的 VLR, 其中一个重要的信息就是用户在其归属地 HLR申请的呼叫前转业务， 主要包 括触发呼叫前转的条件， 以及呼叫前转号码。
105、 所述用户作为被叫用户， 由主叫用户向该用户发起呼叫请求， 为主 叫用户提供服务的 MSC/HLR (或者 VMSC/VLR ) 向被叫用户的归属地 HLR 请求漫游号码。
106、 被叫用户的 HLR收到主叫用户 MSC的请求漫游号码后， 向被叫用 户漫游地的 VMSC/VLR请求漫游号码， 并向主叫用户的 MSC/HLR (或者 VMSC/VLR )返回请求得到的被叫用户的漫游号码。
107、 为主叫用户提供服务的 MSC/HLR (或者 VMSC/VLR )根据获取到 的漫游号码呼叫被叫用户， 此时， 该呼叫被接续到被叫用户漫游地的
VMSC/VLR。
108、 被叫用户漫游地的 VMSC/VLR向被叫用户发起呼叫请求。
109、 若被叫用户忙、 无应答或者不在服务区， 则会向被叫用户漫游地的 VMSC/VLR返回一个响应， 该响应中包含被叫用户忙、 无应答或者不在服务 区等无法建立连接的信息。
110、被叫用户漫游地的 VMSC/VLR将该呼叫请求接续到被叫用户的呼叫 前转号码。
通过上述流程可知， 目前的呼叫前转是由被叫用户归属地的 HLR和被叫 当前所在地的 VMSC/VLR配合实现的。 用户漫游到 VMSC/VLR时， VLR从 HLR获得用户定制的业务情况， 然后当用户作为被叫发生上述情况时， VMSC 将主叫的呼叫前转到前转号码。
在实施本发明的过程中，发明人发现现有呼叫前转的功能至少存在如下缺 陷：
当用户漫游到国外时， 通过用户漫游地的 VMSC/VLR进行前转， 会造成 较高的长途费用。 另夕卜， 由于 ISUP ( ISDN User Part, ISDN用户部分）信令 在穿越国际关口局时，往往由于话路经过多个中间运营商的国际关口局，会导 致主叫号码和原被叫号码丟失。那么当呼叫前转到国内时， 网络无法根据原被 叫号码找到被叫用户归属的邮箱服务器。
发明内容 本发明的实施例提供一种呼叫前转的法、设备及系统， 以使漫游的被叫用 户发生呼叫前转时， 能够节约部分长途费用。
为达到上述目的， 本发明的实施例釆用如下技术方案：
一种被叫用户的呼叫前转方法， 包括：
接收监控实体报告的被叫用户无法建立连接事件；
向呼叫发起实体发送被叫用户前转号码；通知所述呼叫发起实体将呼叫接 续到所述被叫用户前转号码。
一种被叫用户的呼叫前转系统， 包括：
监控实体， 用于向呼叫前转控制实体报告被叫用户无法建立连接事件； 呼叫前转控制实体，用于在接收监控实体报告的被叫用户无法建立连接事 件后， 向呼叫发起实体发送被叫用户前转号码； 并通知呼叫发起实体将呼叫接 续到所述被叫用户前转号码。
一种呼叫前转控制实体， 包括：
接收单元，用于接收到主叫用户的监控实体报告的被叫用户无法建立连接 事件；
发送单元， 用于根据接收到的被叫用户无法建立连接事件， 向呼叫发起实 体发送被叫用户前转号码，通知所述呼叫发起实体将呼叫接续到所述被叫用户 前转号码。
一种网络设备， 包括：
接收单元， 用于接收被叫用户无法建立连接事件， 并用于接收呼叫前转控 制实体发送的被叫用户前转号码；
发送单元， 用于将被叫用户无法建立连接事件发送到呼叫前转控制实体； 呼叫发起单元， 用于向被叫用户前转号码请求呼叫连接。
一种监控实体， 其特征在于包括：
接收单元， 用于从呼叫发起实体接收被叫用户无法建立连接事件， 并用于 接收呼叫前转控制实体发送的被叫用户前转号码；
发送单元， 用于将被叫用户无法建立连接事件发送到呼叫前转控制实体， 并用于将所述的被叫用户前转号码发送到呼叫发起实体，以便所述呼叫发起实 体将呼叫接续至所述被叫用户呼叫前转号码。 由上述技术方案所描述的本发明的实施例，在被叫用户处于无法建立连接 的状态时， 由监控实体发现该状态后， 报告给呼叫前转控制实体， 通过呼叫前 转控制实体，控制呼叫发起实体将呼叫直接接续到所述被叫用户前转号码，可 见，本发明实施例避免了由被叫用户所在地的拜访移动交换中心，将呼叫接续 到所述被叫用户前转号码。如果将本发明实施例运用到被叫用户处于漫游状态 的呼叫前转中，将节省从拜访移动交换中心接续到被叫用户前转号码的长途费 用， 特别是当用户处于国外漫游时， 将节省昂贵的国际长途费用。 由此， 以本 发明实施例的方案替代现有技术中 HLR提供的呼叫转移， 从而减少了前转的 成本。
附图说明
图 1为现有技术中呼叫前转方法的流程图；
图 2为本发明实施例 1中被叫用户的呼叫前转方法的流程图；
图 3为图 2对应呼叫前转系统的框图；
图 4为本发明实施例 1中呼叫前转控制实体的框图；
图 5为本发明实施例 1中呼叫发起实体的框图；
图 6为本发明实施例 2中被叫用户的呼叫前转方法的流程图；
图 7为本发明实施例 3中被叫用户的呼叫前转方法的流程图；
图 8为本发明实施例 3中另一种被叫用户的呼叫前转方法的流程图。
具体实施方式
本发明实施例在被叫用户处于无法建立连接的状态时，通过控制主叫用户 的呼叫发起实体将呼叫接续到被叫用户的前转号码，从而实现呼叫前转，避免 了由被叫用户所在地的拜访移动交换中心，将呼叫接续到所述被叫用户前转号 码。若被叫用户处于漫游状态，釆用本发明实施例实现从主叫侧到前转号码的 呼叫前转， 将节约从拜访移动交换中心接续到被叫用户前转号码的长途费用。
上述对主叫用户的呼叫发起实体控制可以通过智能网 （IN, Intelligent
Network )来实现， 智能网技术是目前广泛应用在电路域（以下称 CS域）通 信网络中的一种业务提供体系， 如 PSTN (公共交换电话网络）、 GSM (全球 移动通信系统）、 WCDMA (宽频码分多址）、 CDMA (码分多址）等核心通信 网中都运用了 IN提供业务。 通过在核心通信网中引入业务交换点（SSP ), 使 核心通信网与上层智能网业务设备相连。智能网作为通信网的高层业务网， 能 够为通信网生成和实现各种新业务。
如果某用户 B申请了被叫的 IN业务， 则需要在用户 B的 HLR中预先登 记智能业务的用户签约信息（ CSI， Camel Subscriber Information )， 通过 IN提 供业务的具体过程如下： 当主叫用户向用户 B发起呼叫时， 主叫用户的 MSC 从用户 B的 HLR中得到 CSI数据， 得知用户 B申请了智能网业务； 则主叫用 户的 MSC按照 IN呼叫处理流程， 即向用户 B所属的业务控制点（ SCP )发送 初始检测点 （ IDP , Initial DP ) 消息， 触发该呼叫流程到智能网； 从而建立了 主叫用户 MSC与 IN之间的控制关系。
当被叫用户所在地的 MSC发生被叫用户的忙、 无应答或不在服务区等无 法建立连接的情况时，可以将被叫用户无法建立连接的信息传递到主叫用户的 MSC, 并通过主叫用户的 MSC上艮到 IN, 后续呼叫可以在 IN控制下进行处 理。
在实际运用时触发 IN业务的方法不限于上述通过 CSI的方式触发， 还可 以采用其他触发方式， 例如： 通过 GMSC (移动网网关局）进行触发， 具体触 发的运用详见实施例。下面结合附图对本发明呼叫前转的方法及设备的实施例 进行详细描述。
实施例 1:
本实施例公开了一种被叫用户的呼叫前转方法， 如图 2示， 该方法具体包 括如下步骤：
201、 在主叫用户的呼叫发起实体接收到被叫用户的拜访移动交换中心返 回的被叫用户无法建立连接事件后，由监控实体监控到所述的被叫用户无法建 立连接事件， 并且该监控实体将被叫用户无法建立连接事件向智能网报告；
202、 智能网根据接收到的被叫用户无法建立连接事件， 向所述呼叫发起 实体发送被叫用户前转号码；
203、智能网通知所述呼叫发起实体将呼叫接续到所述被叫用户前转号码。 对应于上述被叫用户的呼叫前转方法，本实施例还提供一种被叫用户的呼 叫前转系统， 如图 3所示， 该系统包括： 位于主叫用户所在地的呼叫发起实体 31 , 用来监控的监控实体 33 , 以及用来控制呼叫前转的呼叫前转控制实体 32。 当呼叫发起实体 31接收到被叫用户无法建立连接事件后 （如： 被叫用户 忙、无应答或者不在服务区等），可以通过监控实体 33监控到被叫用户无法建 立连接事件后，该监控实体 33会向呼叫前转控制实体 32报告被叫用户无法建 立连接事件。 呼叫前转控制实体 32在接收到被叫用户无法建立连接事件后， 向所述呼叫发起实体 31发送被叫用户前转号码；并通知呼叫发起实体 31将呼 叫接续到所述被叫用户前转号码。
如图 4所示， 上述呼叫前转控制实体包括： 接收单元 41和发送单元 42。 其中， 如果主叫用户的呼叫发起实体接收到被叫用户的拜访移动交换中 心，返回的被叫用户无法建立连接事件后， 该呼叫发起实体将被叫用户无法建 立连接事件向该控制实体报告； 控制实体中的接收单元 41接收到所述被叫用 户无法建立连接事件后， 通过发送单元 42向所述呼叫发起实体发送被叫用户 前转号码， 并通知所述呼叫发起实体将呼叫接续到所述被叫用户前转号码。
如图 5所示， 本实施例还提供一种网络设备， 包括： 接收单元 51、 发送 单元 52、 呼叫发起单元 53。
其中， 接收单元 51能够从被叫用户的拜访移动交换中心接收被叫用户无 法建立连接事件； 并通过发送单元 52将被叫用户无法建立连接事件发送到呼 叫前转控制实体。 呼叫前转控制实体在接收到被叫用户无法建立连接事件后， 向呼叫发起实体发送被叫用户前转号码； 呼叫发起实体通过接收单元 51接收 到被叫用户前转号码后， 通过呼叫发起单元 53向被叫用户前转号码请求呼叫 连接。 图 5所示的网络设备可以是移动交换中心， 也可以是移动网网关局。
本实施例还提供一种监控实体， 包括接收单元和发送单元， 其中接收单元 从呼叫发起实体接收被叫用户无法建立连接事件；然后通过发送单元将被叫用 户无法建立连接事件发送到呼叫前转控制实体。 同时， 本实施例中的接收单元 还接收呼叫前转控制实体发送的被叫用户前转号码；然后通过发送单元将所述 的被叫用户前转号码发送到呼叫发起实体，以便于所述呼叫发起实体将呼叫接 续至所述被叫用户呼叫前转号码。 由上述方案所述的本发明实施例，在呼叫前 转控制实体接收到被叫用户无法建立连接事件后，向呼叫发起实体发送被叫用 户前转号码， 并控制将本次呼叫接续到被叫用户前转号码。 由于在接续到被叫 用户前转号码时， 没有直接通过被叫用户拜访的移动交换中心完成， 而从主叫 用户的呼叫发起实体直接将呼叫接续到前转号码，从而省去了被叫用户拜访的 移动交换中心到前转号码之间的长途费用。 即， 以上述本发明实施例的方案替 代现有技术中 HLR提供的呼叫转移方案， 减少了前转的成本。
实施例 2:
本实施例是针对主叫用户的呼叫发起实体和监控实体为移动交换中心时， 该被叫用户的呼叫前转方法的具体实现过程，并且本实施例中通过智能网中的 业务控制点 （SCP ) 实现呼叫前转控制。
在实现本实施例之前， 首先要求被叫用户申请相关的智能网呼叫前转业 务， 这样 SCP就会为被叫用户提供呼叫前转业务， 其中 SCP中记录了设定的 前转号码， 并且还在被叫用户的归属位置寄存器中，记录有关用户申请智能网 呼叫前转业务的 T-CSI (终结 CSI )。 如图 6所示， 该被叫用户的呼叫前转方法 包括如下步骤：
601、主叫用户向被叫用户发起呼叫，此时主叫用户可能也处于漫游状态， 也可能处于主叫用户的归属地，所以主叫用户可能通过其归属地的移动交换中 心 ( OMSC )向被叫用户发起呼叫， 也可能是通过其他网络（如其漫游地的拜 访移动交换中心）向被叫用户发起呼叫。 本实施例中情况为： 主叫用户在归属 地， 通过 OMSC向被叫用户发起呼叫。
602、 主叫用户的 OMSC向被叫用户的 HLR发起 SRI (发送路由信息） 操作， 以请求向被叫用户发起呼叫， 或者获取相应的被叫用户的漫游号码 ( MSRN ) 以便通过 MSRN向被叫用户发起呼叫。
603、 由于被叫用户处于漫游状态， 并且在 HLR中记录了该被叫用户申请 智能网呼叫前转业务的 T-CSI, 所以， 被叫用户的 HLR向主叫用户的 OMSC 返回 i己录的 T-CSI。
604、 主叫用户的 OMSC接收到上述的 T-CSI后， 得知被叫用户申请了智 能网业务， 所以根据所述的 T-CSI触发将本次呼叫通过智能网来处理， 即向智 能网中提供业务的 SCP发送初始监测点消息 （ IDP )。
605、 SCP接收到 IDP消息后， 开始处理本次呼叫， 即向 OMSC发送一个 监控请求， 以便监控 OMSC是否接收到被叫用户无法建立连接事件， 一般在 被叫用户忙、无应答或不在服务区时， OMSC会接收到被叫用户无法建立连接 事件，本实施例中的监控请求通过 RRBE (请求报告基本呼叫状态）消息实现。
606、 SCP向 OMSC发送一个呼叫继续指示， 以便 OMSC继续下面的呼 叫流程。
607、 主叫用户的 OMSC再次向被叫用户的 HLR发起 SRI (发送路由信 息）操作， 获取相应的被叫用户的漫游号码（MSRN ) 以便通过 MSRN 向被 叫用户发起呼叫。
608、 被叫用户的 HLR 接收到本次 SRI 后， 向被叫用户漫游地的 VMSC/VLR发起获取 MSR 的请求。
609、 所述 VMSC/VLR向被叫用户的 HLR返回一个应答， 并携带被叫用 户的 MSRN。
610、 由于上次的 SRI操作已经返回了 T-CSI, 所以本步骤中被叫用户的 HLR向主叫用户的 OMSC返回被叫用户的 MSRN。
611、 主叫用户的 OMSC根据被叫用户的 MSRN, 向所述 VMSC/VLR发 起呼叫请求。
612、所述 VMSC/VLR接收到呼叫请求后， 向被叫用户发起呼叫请求， 一 般在被叫用户应答时建立相关连接，按照现有呼叫流程处理。对于被叫用户处 于忙、 不在服务区， 或者被叫用户无应答等无法建立连接的状态， 按照本实施 例方法处理。
613、 由于被叫用户无法建立连接， 所以所述 VMSC/VLR向主叫用户的 OMSC返回被叫用户无法建立连接事件， 并拆除与主叫用户的 OMSC之间连 接。
614、由于 SCP向主叫用户 OMSC发送了监控请求， 以监控被叫用户无法 建立连接事件， 所以， 主叫用户 OMSC通过基本呼叫状态事件报告（ERB, Event Report BCSM )上报被叫用户无法建立连接事件，并悬置呼叫，等待 SCP 的指示。
615、 SCP根据 IDP信息判断被叫用户已经漫游， 并且不能与被叫用户建 立连接， 需要将本次呼叫接续到被叫用户的前转号码， 并且在 SCP 中已经记 录了被叫用户的前转号码， 所以， SCP向主叫用户 OMSC发送被叫用户的前 转号码， 并指示主叫用户 OMSC将被此呼叫接续被叫用户的前转号码。 所述 的前转号码可以是语音信箱、视频信箱或其他可用号码， 本实施例中被叫用户 设定了一个语音信箱 （VM, Voice Mail )。
616、 主叫用户 OMSC将本次呼叫接续到被叫用户设定的前转号码， 即语 音信箱， 接下来的录音流程由 OMSC和语音信箱配合完成。
本实施例通过智能网中的 SCP对被叫用户的呼叫前转进行控制， 使得在 被叫用户不能建立连接时， 直接通过主叫用户的 OMSC将本次呼叫接续到被 叫用户的前转号码， 如语音信箱等。 这样可以节约从被叫用户漫游的 VMSC 接续到前转号码时发生的长途费用。 并且， 本实施例通过主叫用户的 OMSC 信网络对迂回路由的处理量。
本实施例中通过主叫用户的 OMSC进行接续前转号码， 由于前转号码记 录在 SCP中的， 并且 OMSC可以通过 SCP可以获得前转号码， 所以， 在采用 ISUP信令进行业务触发时， 本次呼叫可以接续到前转号码。
本实施例需要用户申请通过智能网控制呼叫前转的业务,可以用在被叫用 户处于漫游状态时进行呼叫前转， 包括国内漫游和国外漫游。这种通过被叫用 户的 T-CSI触发智能网控制的方式， 针对申请该项业务的被叫用户有效， 可以 节约服务器端的业务处理量。
实施例 3:
本实施例是针对主叫用户的呼叫发起实体和监控实体为移动网网关局时， 该被叫用户的呼叫前转方法的具体实现过程，并且本实施例中通过智能网中的 业务控制点（SCP ) 实现呼叫前转控制实体。 由于移动网网关局所接收到的呼 叫请求是根据被叫用户的 MSRN发出的， 所以移动网网关局可以确定本次呼 叫是属于漫游呼叫， 可以直接将本次呼叫交由 SCP控制， 以便实现在被叫用 户无法建立连接时， 能够节约呼叫前转时的长途话费。 如图 7所示， 该被叫用 户的呼叫前转方法包括如下步骤：
701、主叫用户向被叫用户发起呼叫，此时主叫用户可能也处于漫游状态， 也可能处于主叫用户的归属地，所以主叫用户可能通过其归属地的移动交换中 心（OMSC )向被叫用户发起呼叫， 也可能是通过其他网络（如其漫游地的拜 访移动交换中心）向被叫用户发起呼叫。 本实施例中情况为： 主叫用户在归属 地， 通过 OMSC向被叫用户发起呼叫。
702、 主叫用户的 OMSC向被叫用户的 HLR发起 SRI (发送路由信息） 操作， 以请求向被叫用户发起呼叫， 或者获取相应的被叫用户的漫游号码 ( MSR ) 以便通过 MSRN向被叫用户发起呼叫。
703、 被叫用户的 HLR接收到 S 1后， 向被叫用户漫游地的 VMSC/VLR 发起获取 MSR 的请求。
704、 所述 VMSC/VLR向被叫用户的 HLR返回一个应答， 并携带被叫用 户的 MSRN。
705、 被叫用户的 HLR向主叫用户的 OMSC返回被叫用户的 MSRN。
706、 主叫用户的 OMSC通过 MSRN向移动网网关局（ GMSC )发起呼叫 请求。
707、 由于通过 GMSC建立连接的呼叫都是由于被叫用户处于漫游状态， 需要智能网对本次呼叫进行控制， 故而 GMSC向智能网的 SCP发送一个初始 检测点消息（ IDP ), 以触发 SCP对本次呼叫的监控。
708、 SCP接收到 IDP后， 开始处理本次呼叫， 即： 直接向 GMSC发送一 个监控请求， 以便监控 GMSC是否接收到被叫用户无法建立连接事件。 一般 在被叫用户忙、无应答或不在服务区时， GMSC会接收到被叫用户无法建立连 接事件， 本实施例中的监控请求通过 RRBE (请求报告基本呼叫状态）消息实 现。
709、 SCP向 GMSC发送一个呼叫继续指示， 以便 GMSC继续下面的呼 叫流程。
710、 GMSC根据被叫用户的 MSRN, 向所述 VMS 7VLR发起呼叫请求。
711、 所述 VMSC/VLR接收到呼叫请求后， 向被叫用户发起呼叫请求， 一 般在被叫用户应答时建立相关连接，按照现有呼叫流程处理。对于被叫用户处 于忙、 不在服务区， 或者被叫用户无应答等无法建立连接的状态， 按照本实施 例方法处理。
712、 由于被叫用户无法建立连接， 所以所述 VMSC/VLR向主叫用户的 GMSC返回被叫用户无法建立连接事件， 并拆除与主叫用户的 GMSC之间连 接。 713、由于 SCP向 GMSC发送了监控请求， 以监控被叫用户无法建立连接 事件， 所以， GMSC通过基本呼叫状态事件报告 ( ERB , Event Report BCSM ) 上报被叫用户无法建立连接事件， 并悬置呼叫， 等待 SCP的指示。
714、 SCP直接向 GMSC发送被叫用户的前转号码，并指示主叫用户 GMSC 将被刺呼叫接续被叫用户的前转号码。所述的前转号码可以是语音信箱、视频 信箱或其他可用号码， 本实施例中被叫用户设定了一个语音信箱（VM, Voice Mail )。
715、 GMSC将本次呼叫接续到被叫用户设定的前转号码， 即语音信箱， 接下来的录音流程由 GMSC和语音信箱配合完成。
可替代地， 当呼叫发起实体为移动网网关局， 监控实体为中间设备时， 本 发明实施例具体可以为： GMSC通过中间设备与 SCP通信， 具体通信过程与 步骤 701至步骤 706—致， 对于后续处理流程步骤 707到步骤 714, 可以采用 图 8所示的流程代替， 具体描述如下：
1、 GMSC接收到呼叫请求后， 先向中间设备发送智能网信令中的初始地 址消息（IAM )。
2、 中间设备接收到 IAM消息后， 根据这个 IAM消息向 SCP发送 IDP消
3、 SCP向该中间设备发送一个监控请求， 以便实现中间设备监控 GMSC 是否接收到被叫用户无法建立连接事件。 本实施例中的监控请求通过 RRBE (请求报告基本呼叫状态 ) 消息实现。
4、 SCP向中间设备发送一个呼叫继续指示。
5、 中间设备将该呼叫继续指示转发给 GMSC, 以便 GMSC继续下面的呼 叫流程。
6、 GMSC根据被叫用户的 MSRN, 向所述 VMSC/VLR发起呼叫请求。 7、 所述 VMSC/VLR接收到呼叫请求后， 向被叫用户发起呼叫请求， 一般 在被叫用户应答时建立相关连接，按照现有呼叫流程处理。对于被叫用户处于 忙、 不在服务区， 或者被叫用户无应答等无法建立连接的状态， 按照本实施例 方法处理。
8、 由于被叫用户无法建立连接， 所以所述 VMSC/VLR 向主叫用户的 GMSC返回被叫用户无法建立连接事件， 并拆除与主叫用户的 GMSC之间连 接。
9、 由于 SCP向中间设备发送了监控请求， 以监控被叫用户无法建立连接 事件， 所以， GMSC通过 ERB向中间设备上报被叫用户无法建立连接事件， 并悬置呼叫。
10、 中间设备将所述被叫用户无法建立连接事件通过 ERB上报给 SCP。
11、 SCP向中间设备发送被叫用户的前转号码， 并向中间设备发送指示主 叫用户 GMSC将呼叫接续被叫用户的前转号码的指令。
12、 中间设备将被叫用户的前转号码和指令转发给 GMSC。
13、 GMSC将本次呼叫接续到被叫用户设定的前转号码， 即语音信箱，接 下来的录音流程由 GMSC和语音信箱配合完成。
本实施例通过智能网中的 SCP对被叫用户的呼叫前转进行控制， 使得在 被叫用户不能建立连接时， 直接通过主叫用户的 GMSC将本次呼叫接续到被 叫用户的前转号码， 如语音信箱等。 这样可以节约从被叫用户漫游的 VMSC 接续到前转号码时发生的长途费用。
本实施例中通过主叫用户的 GMSC进行接续前转号码， 由于前转号码记 录在 SCP中的， 并且 GMSC可以通过 SCP可以获得前转号码， 所以， 在采用 ISUP信令或者智能网信令进行业务触发时， 本次呼叫可以接续到前转号码。
本实施例可以在被叫用户处于漫游状态时进行呼叫前转，包括国内漫游和 国外漫游。 本实施例中触发智能网控制中， 没有采用 T-CSI, 而是对每个经过 GMSC的呼叫都通过 SCP来控制， 不需要用户申请该项呼叫前转的业务， 为 用户带来了较多的方便。
实施例 4:
本实施例提供一种被叫用户的呼叫前转系统， 包括：监控实体和呼叫前转 控制实体， 其中监控实体向呼叫前转控制实体报告被叫用户无法建立连接事 件； 呼叫前转控制实体在接收到被叫用户无法建立连接事件后， 向呼叫发起实 体发送被叫用户前转号码；并通知呼叫发起实体将呼叫接续到所述被叫用户前 转号码。上述的监控实体要能够向呼叫前转控制实体报告被叫用户无法建立连 接事件， 实现要进行设定， 具体为： 通过呼叫前转控制实体向监控实体发送监 控请求， 请求监控实体监控被叫用户无法建立连接事件。
对应于上述实施例 2, 本实施例中主叫用户的监控实体和呼叫发起实体可 以通过主叫用户的 OMSC实现； 所述 OMSC从被叫用户归属位置寄存器接收 被叫用户的签约信息，并根据被叫用户的签约信息触发所述呼叫前转控制实体 向监控实体（即主叫用户的移动交换中心）发送监控请求。 其中， OMSC作为 主叫用户的呼叫发起实体和监控实体， 主要包括如图 5所描述的接收单元 51、 发送单元 52以及呼叫发起单元 53。 对于其中各个单元的具体描述详见实施例 1中对图 5的描述， 此处不再赘述。
对应于实施例 3 , 本实施例中主叫用户的监控实体和呼叫发起实体可以通 过主叫用户的 GMSC实现； 所述 GMSC从主叫用户移动交换中心收到被叫用 户的漫游号码， 并触发所述呼叫前转控制实体向监控实体（即 GMSC )发送监 控请求。
其中， GMSC作为主叫用户的呼叫发起实体和监控实体， 主要包括如图 5 所描述的接收单元 51、发送单元 52以及呼叫发起单元 53。对于其中各个单元 的具体描述详见实施例 1中对图 5的描述， 此处不再赞述。
本实施例中被叫用户的呼叫前转系统也可以采用如下方式组建：呼叫发起 实体通过主叫用户的 GMSC实现，而监控实体通过中间设备实现。所述 GMSC 通过所述中间设备连接到呼叫前转控制实体， 所述 GMSC通过该中间设备， 触发所述呼叫前转控制实体向所述中间设备发送监控请求。
在实施例 2和实施例 3中均需要通过 SCP对呼叫进行控制， SCP作为一 种呼叫前转控制实体， 如图 4所示， 具体包括： 接收单元 41和发送单元 42。
在具体实现时， 需要发送单元 42事先向主叫用户的呼叫发起实体发送监 控请求， 请求监控主叫用户的呼叫发起实体接收到被叫用户无法建立连接事 件。
这样，在主叫用户的呼叫发起实体接收到被叫用户的拜访移动交换中心返 回的被叫用户无法建立连接事件后，该呼叫发起实体会自动将被叫用户无法建 立连接事件向该控制实体报告； 控制实体中的接收单元 41接收到所述被叫用 户无法建立连接事件后， 通过发送单元 42向所述呼叫发起实体发送被叫用户 前转号码， 并控制所述呼叫发起实体将呼叫接续到所述被叫用户前转号码。 本实施例中的呼叫前转控制实体除了通过 SCP实现以外， 也可以通过其 他方式实现， 例如： 通过一个单独具有 SCP相应功能的设备。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到本发 明可借助软件加必需的通用硬件平台的方式来实现， 当然也可以通过硬件，但 很多情况下前者是更佳的实施方式。基于这样的理解， 本发明的技术方案本质 机软件产品存储在可读取的存储介质中， 如计算机的软盘， 硬盘或光盘等， 包 括若干指令用以使得一台设备 (可以是服务器， 或者网络设备等）执行本发明 各个实施例所述的方法。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于 此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到 的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围 应该以权利要求的保护范围为准。

Claims

权 利 要 求
1、 一种被叫用户的呼叫前转方法， 其特征在于包括：
接收监控实体报告的被叫用户无法建立连接事件；
向呼叫发起实体发送被叫用户前转号码；通知所述呼叫发起实体将呼叫接 续到所述被叫用户前转号码。
2、 根据权利要求 1所述的被叫用户的呼叫前转方法， 其特征在于， 在接 收监控实体报告的被叫用户无法建立连接事件之前， 该方法还包括：
向监控实体发送监控请求， 请求监控实体监控被叫用户无法建立连接事 件。
3、 根据权利要求 2所述的被叫用户的呼叫前转方法， 其特征在于， 所述 呼叫发起实体和所述监控实体为主叫用户的移动交换中心，在所述向监控实体 发送监控请求之前， 该方法还包括：
所述主叫用户的移动交换中心从被叫用户归属位置寄存器接收被叫用户 的签约信息；
所述主叫用户的移动交换中心根据被叫用户的签约信息触发呼叫前转控 制实体向主叫用户的移动交换中心发送监控请求。
4、 根据权利要求 3所述的被叫用户的呼叫前转方法， 其特征在于， 在接 收监控实体报告的被叫用户无法建立连接事件之前， 该方法还包括：
主叫用户的移动交换中心通过被叫用户归属位置寄存器获取被叫用户的 漫游号码；
所述主叫用户的移动交换中心根据被叫用户的漫游号码向被叫用户拜访 的移动交换中心发起呼叫请求；
所述主叫用户的移动交换中心从所述被叫用户拜访的移动交换中心接收 到被叫用户无法建立连接事件。
5、 根据权利要求 3所述的被叫用户的呼叫前转方法， 其特征在于， 所述 触发呼叫前转控制实体向主叫用户的移动交换中心发送监控请求为：通过综合 业务数字网用户部分信令触发所述呼叫前转控制实体向所述主叫用户的移动 交换中心发送监控请求。
6、 根据权利要求 2所述的被叫用户的呼叫前转方法， 其特征在于， 所述 呼叫发起实体和所述监控实体为主叫用户的移动网网关局，在所述向监控实体 发送监控请求之前， 该方法还包括：
所述移动网网关局从主叫用户移动交换中心收到被叫用户的漫游号码； 所述移动网网关局触发呼叫前转控制实体向所述主叫用户的移动网网关 局发送监控请求。
7、 根据权利要求 2所述的被叫用户的呼叫前转方法， 其特征在于， 所述 呼叫发起实体为主叫用户的移动网网关局， 所述监控实体为中间设备， 所述移 动网网关局通过中间设备连接到呼叫前转控制实体，在所述向监控实体发送监 控请求之前， 该方法还包括：
所述移动网网关局从主叫用户移动交换中心收到被叫用户的漫游号码； 所述移动网网关局通过中间设备触发所述呼叫前转控制实体向所述中间 设备发送监控请求。
8、 根据权利要求 6或 7所述的被叫用户的呼叫前转方法， 其特征在于， 在接收监控实体报告的被叫用户无法建立连接事件之前， 该方法还包括： 所述移动网网关局根据被叫用户的漫游号码向被叫用户拜访的移动交换 中心发起呼叫请求；
所述移动网网关局从被叫用户拜访的移动交换中心接收到被叫用户无法 建立连接事件。
9、 根据权利要求 6所述的被叫用户的呼叫前转方法， 其特征在于， 所述 触发呼叫前转控制实体向所述主叫用户的移动网网关发送监控请求包括：通过 智能网信令触发所述呼叫前转控制实体向所述移动网网关局发送监控请求。
10、根据权利要求 7所述的被叫用户的呼叫前转方法， 其特征在于， 所述 触发呼叫前转控制实体向中间设备发送监控请求包括：通过综合业务数字网用 户部分信令触发所述呼叫前转控制实体向中间设备发送监控请求。
11、 一种被叫用户的呼叫前转系统， 其特征在于包括：
监控实体， 用于向呼叫前转控制实体报告被叫用户无法建立连接事件； 呼叫前转控制实体，用于在接收所述监控实体报告的被叫用户无法建立连 接事件后， 向呼叫发起实体发送被叫用户前转号码； 并通知呼叫发起实体将呼 叫接续到所述被叫用户前转号码。
12、 根据权利要求 11所述的被叫用户的呼叫前转系统， 其特征在于， 所 述呼叫前转控制实体还用于向监控实体发送监控请求，请求监控实体监控被叫 用户无法建立连接事件。
13、 根据权利要求 12所述的被叫用户的呼叫前转系统， 其特征在于， 所 述呼叫发起实体和监控实体由主叫用户的移动交换中心实现；所述移动交换中 心从被叫用户归属位置寄存器接收被叫用户的签约信息，并根据被叫用户的签 约信息触发所述呼叫前转控制实体向主叫用户的移动交换中心发送监控请求。
14、 根据权利要求 12所述的被叫用户的呼叫前转系统， 其特征在于， 所 述呼叫发起实体和所述监控实体由主叫用户的移动网网关局实现；所述移动网 网关局从主叫用户移动交换中心收到被叫用户的漫游号码，并触发所述呼叫前 转控制实体向移动网网关局发送监控请求。
15、 根据权利要求 13所述的被叫用户的呼叫前转系统， 其特征在于， 所 述呼叫发起实体由移动网网关局实现， 所述监控实体由中间设备实现， 所述移 动网网关局通过所述中间设备连接到呼叫前转控制实体，所述移动网网关局通 过该中间设备， 触发所述呼叫前转控制实体向所述中间设备发送监控请求。
16、 一种呼叫前转控制实体， 其特征在于包括：
接收单元，用于接收到主叫用户的监控实体报告的被叫用户无法建立连接 事件；
发送单元， 用于根据所述接收单元接收到的被叫用户无法建立连接事件， 向呼叫发起实体发送被叫用户前转号码，通知所述呼叫发起实体将呼叫接续到 所述被叫用户前转号码。
17、 根据权利要求 16所述的呼叫前转控制实体， 其特征在于：
所述发送单元还用于向主叫用户的监控实体发送监控请求，请求监控主叫 用户的呼叫发起实体接收到被叫用户无法建立连接事件。
18、 一种网络设备， 其特征在于包括：
接收单元， 用于接收被叫用户无法建立连接事件， 并用于接收呼叫前转控 制实体发送的被叫用户前转号码；
发送单元， 用于将被叫用户无法建立连接事件发送到呼叫前转控制实体； 呼叫发起单元， 用于向被叫用户前转号码请求呼叫连接。
19、 根据权利要求 18所述的网络设备， 其特征在于， 该网络设备为移动 交换中心或移动网网关局。
20、 一种监控实体， 其特征在于包括：
接收单元， 用于从呼叫发起实体接收被叫用户无法建立连接事件， 并用于 接收呼叫前转控制实体发送的被叫用户前转号码；
发送单元， 用于将被叫用户无法建立连接事件发送到呼叫前转控制实体， 并用于将所述的被叫用户前转号码发送到呼叫发起实体，以便所述呼叫发起实 体将呼叫接续至所述被叫用户呼叫前转号码。
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CN101909269B (zh) * 2010-08-09 2015-03-25 中兴通讯股份有限公司 实现一机多号终端前转呼叫的方法、系统、业务控制点
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