WO2008145051A1 - Procédé servant à convertir des supports de conversation, procédé et dispositif servant à mettre à jour l'établissement d'un appel - Google Patents

Procédé servant à convertir des supports de conversation, procédé et dispositif servant à mettre à jour l'établissement d'un appel Download PDF

Info

Publication number
WO2008145051A1
WO2008145051A1 PCT/CN2008/071017 CN2008071017W WO2008145051A1 WO 2008145051 A1 WO2008145051 A1 WO 2008145051A1 CN 2008071017 W CN2008071017 W CN 2008071017W WO 2008145051 A1 WO2008145051 A1 WO 2008145051A1
Authority
WO
WIPO (PCT)
Prior art keywords
media type
iccf
call
terminal device
party
Prior art date
Application number
PCT/CN2008/071017
Other languages
English (en)
French (fr)
Inventor
Shuiping Long
Yaoping Luo
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP08748623A priority Critical patent/EP2056618B1/en
Priority to AT08748623T priority patent/ATE516675T1/de
Publication of WO2008145051A1 publication Critical patent/WO2008145051A1/zh
Priority to US12/424,976 priority patent/US8588211B2/en
Priority to US13/542,196 priority patent/US8515053B2/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1089—In-session procedures by adding media; by removing media
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1095—Inter-network session transfer or sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]

Definitions

  • the present invention relates to an IMS centralized control technology in the field of communication technologies, and in particular, to an ICS session medium change method, a call setup update, an ICS session media change device, a call setup update device, and a terminal device.
  • CS Circuit-Switched
  • GSM Global System for Mobile communications
  • the mobile switching center is responsible for call routing and business logic execution, such as call forwarding services, call holding services, and so on.
  • IP Multimedia Sub-system is a packet-switched (PS) service network. Its service provision is independent of roaming, which facilitates the introduction of new multimedia services.
  • the IMS supports the user equipment.
  • the UE accesses the IMS network through various packet switched access networks (e.g., GPRS) for IMS multimedia services.
  • the packet-switched IMS network is the future development trend of the communication network, but the IMS network is also a relatively complex network. It is foreseeable that the full deployment of the packet-switched IMS network will not be completed in a short time, and at the same time, all CS networks are impossible. The user replaces the new IMS terminal in a short time, and the CS network will coexist with the IMS network for a long period of time, so the CS network and the IMS network need to operate at the same time.
  • the 3GPP The 3rd Generation Partnership Project proposes the IMS Centralised Service (ICS) topic, which requires the user equipment UE to carry voice or video through the CS network (Visual Phone, VP) media to establish an IMS call, and at the same time, weaken or remove the service processing logic in the MSC; the UE sends and receives IMS call related control signaling through the newly introduced IMS CS Control Channel (ICCC), ICCC may supplement business data through unstructured (Unstructured Supplementary Service Data (USSD) message, called: ICCC-cs; or through PS bearer, called: ICCC-ps.
  • ICS IMS Centralised Service
  • An existing calling process for establishing an IMS centralized service control call through a CS network includes: Step 101 to Step 104, the terminal device establishes an ICCC control channel with an IMS CS Control Function (ICCF) and passes The control channel sends the number of the called party to the ICCF.
  • ICCF IMS CS Control Function
  • Step 101 The terminal device sends a session invitation (Invite) to the ICCF.
  • the session invitation message includes a phone number of the called party, that is, a number of the second party.
  • the session invitation can be transmitted over a USSD or PS network.
  • the adopted PS network may be a packet access network such as GPRS, and the specific manner of transmission may be selected according to the network service opened by the user terminal.
  • Step 102 the ICCF returns a temporary response message (183), where the temporary response message may include
  • the number of the ICCF may also be configured in advance by the terminal device, and this step does not need to return the number of the ICCF.
  • Step 103 The terminal device sends a temporary response message acknowledgement (PRACK) to the ICCF.
  • Step 104 the ICCF returns 200 OK to confirm the temporary acknowledgement message.
  • PRACK temporary response message acknowledgement
  • Step 105 The terminal device establishes a circuit switched call branch (CS Call Leg) with the ICCF.
  • CS Call Leg circuit switched call branch
  • Step 106 The ICCF establishes a second call branch with the called party.
  • Step 107 The ICCF establishes a call connection between the terminal device and the second party by binding the call branch established with the terminal device and the call branch established with the second party.
  • the ICCF can be regarded as a Back-to-Back-User-Agent (B2BUA), which is equivalent to the bonding of two user equipments UE.
  • B2BUA Back-to-Back-User-Agent
  • the first call branch is established between the ICCF and the terminal device, and the called party establishes a second call branch.
  • the two call branches are relatively independent. When one call branch is removed, another call branch can exist independently.
  • the establishment of the first call branch and the establishment of the second call branch may be mutually triggered.
  • the interaction between the terminal device and the second party signaling and the media connection are implemented, and the implementation is implemented.
  • the called process for establishing an IMS call through the CS network in the IMS centralized service control mode is similar to the above-mentioned calling process, and is not described here.
  • the above existing technical solutions can realize the process of establishing an IMS call through the CS network, but the call or call setup is performed by the calling party and the called party.
  • the IMS allows the call to be arbitrarily deleted and added to various media (voice, video, text, etc.).
  • the existing network equipment of most CS networks does not support the media type conversion after the call is established. Therefore, under the existing IMS centralized control scheme, after the user establishes a call connection with the IMS through the CS, the current CS The limitations of the network cannot change the media type of the call and reduce the user experience of the service.
  • Version 5 (Release 5, R5) developed by 3GPP can provide the CS network to change the media type of the session in the process of the tongue, but it needs to upgrade the existing CS network and its equipment in a wide range. The upgrade cost is huge and it is difficult to promote.
  • the embodiments of the present invention provide an IP multimedia subsystem centralized control ICS session media change method, call setup update, ICS session media change device, call setup update device, and terminal device, which can implement media type change.
  • an embodiment of the present invention provides a method for changing an ICS session media, including:
  • a media type change request receives, by the terminal device or the mobile switching center, a media type change request, where the media type change request includes a new media type; releasing the circuit switched control unit ICCF and the terminal device based on the original media type circuit switched call branch; establishing the ICCF and the Determining, by the terminal device, a circuit switched call branch based on a new media type; updating a media type of the second call branch of the ICCF and the second party to the new media type; or
  • An embodiment of the present invention provides a method for establishing call update, including:
  • An embodiment of the present invention provides a method for changing an ICS session media, including:
  • an embodiment of the present invention provides an ICS session media changing apparatus, including: a receiving unit, configured to receive a media type change request sent by a terminal equipment mobile switching center or a second party, where the media type change request includes a new media type ;
  • a media type change unit configured to: after the receiving unit receives the media type change request, release the circuit-switched call branch based on the original media type established by the ICCF and the terminal device, and reconstruct the ICCF and the terminal device based on the new a circuit type call branch of the media type; and updating the media type of the second call branch of the ICCF with the second party to the new media type.
  • An embodiment of the present invention provides an apparatus for establishing a call, including:
  • a call establishing unit configured to establish a circuit-switched call branch of the ICCF and the terminal device based on the original media type, and request the second party to establish a second call branch based on the original media type;
  • An update request receiving unit configured to receive a change media type request sent by the second party, where the request includes a new media type
  • a call update unit configured to: after the update request receiving unit receives the change media type request, release the circuit-switched call branch based on the original media type established by the ICCF and the terminal device, and establish the ICCF and the terminal device based on a new media type circuit switched call leg; and a second call leg establishing the ICCF and the second party based on the new media type.
  • An embodiment of the present invention provides an ICS session media changing apparatus, including:
  • a media negotiation proxy unit configured to control the terminal device through the circuit switched control channel of the IMS The second party conducts media consultations;
  • a call establishing unit configured to establish a circuit-switched call branch of the ICCF and the terminal device based on the negotiated media type, and establish a second call branch of the ICCF and the second party based on the negotiated media type; Determining a call connection established with the terminal device and the call branch established with the second party, establishing a call connection between the terminal device and the second party.
  • a terminal device provided by the embodiment of the present invention includes: a media type change unit and a call branch reconstruction unit;
  • a media type change unit configured to change a media type used for the second party call
  • a call branch reconstruction unit configured to release the original media established by the terminal device and the ICCF after the media type change unit changes the media type a type of circuit switched call leg; and establishing a circuit switched call leg of the terminal device and the ICCF based on the changed new media type.
  • a media negotiating unit configured to perform media negotiation with the second party by exchanging the control channel with the IMS circuit established by the ICCF;
  • a call branch establishing unit configured to establish, with the ICCF, a circuit switched call leg based on a media type negotiated by the media.
  • the circuit switched call branch based on the original media type established by the terminal device and the ICCF is released, and the terminal device is re-established.
  • a circuit-switched call branch based on a new media type established by the ICCF, and establishing a call connection between the terminal device and the second party by binding the re-established circuit-switched call branch with the second call branch established by the ICCF and the second party Media type changes are implemented in IMS centralized service control calls established through circuit switching.
  • 1 is a flow chart of a caller of a prior art to establish an IMS centralized service control call through a CS network
  • 2 is a flowchart of a call control method according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a call control method according to Embodiment 2 of the present invention.
  • FIG. 5 is a flowchart of a fourth call control method according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of a call control method according to Embodiment 5 of the present invention.
  • FIG. 7 is a flowchart of a call control method according to Embodiment 6 of the present invention.
  • FIG. 9 is a flowchart of a call control method according to Embodiment 8 of the present invention.
  • FIG. 10 is a flowchart of a call control method according to Embodiment 9 of the present invention.
  • FIG. 11 is a flowchart of a ten call control method according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram showing the logical structure of an ICS tongue media changing device according to an embodiment of the present invention
  • FIG. 14 is a schematic diagram showing the logical structure of an ICS session media changing device according to Embodiment 13 of the present invention
  • FIG. 16 is a schematic diagram showing the logical structure of a terminal device according to Embodiment 15 of the present invention.
  • FIG. 17 is a schematic diagram showing the logical structure of an ICS ⁇ tongue media changing apparatus according to an embodiment of the present invention
  • FIG. 18 is a schematic diagram showing the logical structure of an apparatus for call setup update according to Embodiment 17 of the present invention.
  • the embodiment of the invention provides a method for call control and a circuit switching control device and a terminal device of the IMS, which can implement media type change in an IMS centralized service control call established through circuit switching.
  • the method for call control provided by the embodiment of the present invention and the circuit switching control device and terminal device of the IMS are described in detail below.
  • the first embodiment is a call control method.
  • the signaling flow chart is as shown in FIG. 2, and includes: 201.
  • the terminal device is a network device that can perform communication based on circuit switching, for example: may be a mobile phone, a fixed phone, a network computer, a server, etc.; the second party includes establishing a call with the terminal device.
  • the peer terminal device and the access network in which it is located; the access network may be a PS access network or a CS access network, which is not limited by the present invention.
  • the terminal device changes a media type used by the second party call.
  • the media type may include: an audio type, a video type, a file type, and the like.
  • the circuit switched call branch of the release terminal device and the ICCF may be initiated by the terminal device, for example: the step of releasing the circuit switched call leg includes:
  • the terminal device sends a Disconnect message to the MSC serving the MSC; the MSC sends a Release (REL) message to the Media Gateway Controller (MGCF);
  • REL Release
  • MGCF Media Gateway Controller
  • the media gateway controller sends a tongue teardown (BYE) message to the ICCF;
  • the ICCF returns an acknowledgment (200OK) message to the BYE message to the MGCF.
  • the MGCF returns a Release Complete (REL COMP) message to the MSC;
  • the MSC returns a Release message to the terminal device, confirming that the call leg has been released.
  • the circuit-switched call branch of the terminal device and the ICCF can also be initiated by the ICCF, for example: the terminal device sends a media type change request to the ICCF through the ICCC channel, and the ICCF re-initiates the release and the A request for a circuit switched call leg established by the terminal device.
  • the step of establishing a circuit switched call branch based on the new media type may be: the terminal device sends a call setup message to the MSC; the Setup message includes the new media type;
  • the MSC sends an Initial Address (IAM) message to the MGCF;
  • IAM Initial Address
  • the MGCF sends a session invite (Invite) message to the ICCF, where the Invite message includes a new media type; and the MGCF can adapt to the new media type when forwarding the new media type to the ICCF.
  • Invite session invite
  • the ICCF accepts the Invite message, it can be understood that the ICCF receives the Invite
  • the message may trigger the step of changing the media type of the second call branch to the new media type in step 205 of the embodiment, and the step of changing the media type of the second call branch to the new media type is completed.
  • the ICCF returns a 200 OK message to the MGCF for confirmation;
  • an off-hook response (ANM) message to the MSC;
  • the MSC returns a Connect message to the terminal device, and the circuit switched call branch is established.
  • step of establishing a circuit switched call branch based on the new media type in step 204 can also be performed on the circuit switched call leg by receiving a new media type of the terminal device through the ICCC at the ICCF. Thereafter, the circuit-switched call leg based on the new media type is re-initiated by the ICCF.
  • a Re-Invite message or an Update message may be sent to the second party through the ICCF.
  • the second direction the ICCF returns a response message of the Re-Invite message or the Update message, accepting the new media type.
  • the media type can also be changed by reconstructing the second call leg, such as:
  • Step 205 and step 204 of this embodiment have no absolute sequence.
  • Step 205 can be performed simultaneously with step 204 to establish a call branch based on the new media type, for example: after the ICCF receives the Invite message from the media gateway controller, Step 205 may be triggered.
  • the ICCF After the media type change of the second branch is completed, the ICCF returns an acknowledgement message to the terminal device to confirm that the circuit switched call leg establishment is completed.
  • the acknowledgment message can be correspondingly converted by the device in the circuit switched domain to reach the terminal device.
  • the ICCF establishes a call connection between the terminal device and the second party by binding the circuit-switched call branch based on a new media type and the second call branch changed to a new media type.
  • binding circuit switched call branch and the second call branch can be in the call. Binding is performed during the establishment of the calling branch.
  • the binding process mainly includes implementing a connection between the terminal device and the media of the second party.
  • the circuit switched call branch based on the original media type established by the terminal device and the ICCF is released, and the terminal device is re-established.
  • a circuit-switched call branch based on a new media type established with the ICCF and establishing a call connection between the terminal device and the second party by binding the re-established circuit-switched call branch with the second call branch established by the ICCF and the second party, The implementation of the media type change in the IMS centralized service control call established through circuit switching is realized.
  • the ICCF talks with the second call branch established by the second party
  • the circuit-switched call branch based on the original media type established by the terminal device and the ICCF, if the terminal device changes the media type used by the second party to talk;
  • the ICCF establishes a call connection between the terminal device and the second party by binding the circuit-switched call branch based on the new media type and the second call branch changed to the new media type.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • a second embodiment of the present invention provides a call control method.
  • the signaling flow chart is as shown in FIG. 3, and includes: 301.
  • the second call branch established by the two parties makes a call;
  • the terminal device changes a media type used by the second party call
  • the media type may include: an audio type, a video type, a file type, and the like.
  • 303. Determine whether the circuit switched network where the terminal device is located supports the service change and the service change and the UDI Fallback (SCUDIF) feature. If yes, proceed to step 304. If not, proceed to step 305.
  • SCUDIF UDI Fallback
  • the ICCF establishes a call connection between the terminal device and the second party by binding the circuit-switched call branch based on a new media type and the second call branch changed to a new media type.
  • the second embodiment of the present invention differs from the first embodiment in that, according to the first embodiment, it is added whether the circuit switched network supports the SCUDIF feature, and if the support can know that the CS switching network where the terminal device is located supports the media change, Therefore, the media type of the circuit switched call branch established by the terminal device and the ICCF may be changed to the new media type by using a media change mode supported by the R5, so that the media conversion speed is faster.
  • a third embodiment of the present invention provides a call control method.
  • the signaling flow chart is as shown in FIG. 4, and includes: 401.
  • the second call branch established by the two parties makes a call;
  • the terminal device changes a media type used by the second party call.
  • the media type may include: an audio type, a video type, a file type, and the like.
  • step 203 For the specific release of the call, refer to step 203 in the first embodiment.
  • the ICCF establishes a third call branch with a Media Resource Function (MRF); 405.
  • MRF Media Resource Function
  • the media resource device and the second party send and receive Real-time Transport Control Protocol (RTCP) messages by using the third call branch and the second call leg.
  • RTCP Real-time Transport Control Protocol
  • the controlled RTCP message because the RTCP message is sent at regular intervals, if the time of the reconstructed CS call leg based on the new media type is not short enough, it will not be received for a certain period of time.
  • the RTCP message will consider that the call fails, and the second party will actively suspend the call branch with ICCF. Therefore, after releasing the CS call branch, in order to maintain the second call branch established by the ICCF and the second party, the media resource device can be used to establish a call connection with the second party and send and receive RTCP messages.
  • the ICCF can be notified that the media gateway control function entity controls the media gateway to temporarily hold the second call branch as a media endpoint and the second party sends and receives RTCP messages.
  • the embodiment sends a Re-Invite message or an Update message to the second party by using the ICCF; the second direction, the ICCF returns a response of the Re-Invite message or the Update message.
  • the message accepts the new media type and implements a change in the media type.
  • the ICCF establishes a call connection between the terminal device and the second party by binding the circuit-switched call branch based on a new media type and the second call branch changed to a new media type.
  • step 403 it may be determined whether the circuit switched network in which the terminal device is located supports the SCUDIF feature. If supported, the circuit-switched call branch based on the original media type is modified to be based on the SCUDIF feature. The new media type circuit switched call branches and proceeds to step 408. If not, proceed to step 403.
  • the difference between the third embodiment and the second embodiment is that the third party replaces the terminal device with the second party to send and receive RTCP messages, thereby avoiding the process of re-establishing the CS call leg. If the time is too long, the ICCF and the second party's call branch are released, which ensures the stability of the second call leg when the CS branch is reconstructed, which makes the method of the embodiment more practical.
  • Embodiment 4 A method for call control, where a signaling flowchart is shown in FIG. 5, including:
  • the terminal device communicates with the second party through the circuit switched call branch established by the terminal device and the ICCF, and the ICCF establishes a second call branch established by the second party.
  • the terminal device is a network device that can perform communication based on circuit switching, for example: may be a mobile phone, a fixed phone, a network computer, a server, etc.; the second party includes establishing a call with the terminal device.
  • the peer terminal device and the access network in which it is located; the access network may be a PS access network or a CS access network, which is not limited by the present invention.
  • the second party changes a media type used for talking to the terminal device.
  • the media type may include: an audio type, a video type, a file type, and the like.
  • the process of changing the media type of the second call branch to the new media type includes:
  • the ICCF returns a response message of the Re-Invite message or Update message to the second party to accept the new media type. It can be understood that the response message may be returned after the circuit-switched call branch based on the new media type between the terminal device and the ICCF is established in step 505, indicating that the terminal device accepts the new media type. .
  • process of changing the media type of the second call branch to the new media type may also be:
  • the circuit switched call branch of the terminal device and the ICCF may be initiated by the ICCF, for example: the step of releasing the circuit switched call leg includes: The ICCF sends a session teardown (BYE) message to the MGCF;
  • BYE session teardown
  • the MGCF sends a REL message to the MSC serving the terminal device;
  • the MSC sends a Disconnect message to the terminal device
  • the terminal device returns a Release message to the MSC, confirming that the call leg has been released.
  • the MSC returns a REL COMP message to the MGCF;
  • the MGCF returns an acknowledgement (200OK) message to the BYCE message to the ICCF, confirming that the call leg has been removed.
  • the circuit-switched call branch of the terminal device and the ICCF can also be initiated by the terminal device, for example: the ICCF can send a media type change request to the terminal device through the ICCC, and the terminal device initiates release.
  • the specific steps refer to step 203 of the first embodiment.
  • the step of establishing a circuit switched call branch based on the new media type may be:
  • the ICCF sends a session invitation (Invite) message to the MGCF, where the Invite message includes a new media type;
  • the MGCF accepts the Invite message, and the MGCF sends an Initial Address (IAM) message to the MSC;
  • IAM Initial Address
  • the terminal device returns a Connect message to the MSC for confirmation.
  • an off-hook response (ANM) message to the MGCF;
  • the MGCF returns a 200 OK message to the ICCF for confirmation; the circuit switched call leg is established. It can be understood that the step of establishing a circuit switched call branch based on the new media type in step 505 can also be:
  • the terminal device receives the new media type sent by the ICCF through the ICCC, and after the circuit switched call leg is removed, the terminal device re-initiates the step of establishing a circuit-switched call leg based on the new media type.
  • ICCF by binding the circuit-switched call branch based on a new media type and A second call branch changed to a new media type establishes a call connection of the terminal device to the second party.
  • the fourth embodiment of the present invention is different from the first embodiment in that it is applicable to different call scenarios.
  • the initiator of the media change in the first embodiment is the terminal device.
  • the terminal device communicates with the second party through the circuit switched call leg established by the terminal device and the ICCF and the second call branch established by the second party;
  • the call branch establishes a call connection between the terminal device and the second party.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • Embodiment 5 A method for call control, which is shown in Figure 6 and includes:
  • the terminal device communicates with the second party through the circuit switched call branch established by the terminal device and the ICCF, and the ICCF establishes a second call branch established by the second party.
  • the second party changes a media type used for talking to the terminal device.
  • step 604. Determine whether the circuit switched network where the terminal device is located supports the SCUDIF feature. If yes, continue to step 605. If not, proceed to step 606.
  • determining whether the circuit switched network supports the SCUDIF feature can be judged by the ICCF.
  • the terminal device can be judged.
  • the procedure for releasing the circuit switched call leg is as described in step four step 504.
  • the ICCF establishes a call connection between the terminal device and the second party by binding the circuit-switched call branch based on a new media type and the second call branch changed to a new media type.
  • the difference between the fifth embodiment of the present invention and the second embodiment is that it is applicable to different call scenarios.
  • the initiator of the media change in the first embodiment is the terminal device.
  • Embodiment 6 is a method for call control, and a signaling flowchart is shown in FIG. 7, which includes:
  • the terminal device communicates with the second party through the circuit switched call branch established by the terminal device and the ICCF, and the ICCF establishes a second call branch established by the second party.
  • the second party changes a media type used for talking with the terminal device.
  • the ICCF returns a response message of the Re-Invite message or Update message to the second party to accept the new media type.
  • the procedure for releasing the circuit switched call leg is as described in step four step 504. 705.
  • the ICCF establishes a third call branch with the media resource device.
  • the ICCF binds the second call branch and the third call branch.
  • the media resource device and the second party send and receive RTCP messages by using the third call leg and the second call leg.
  • the ICCF can be notified that the media gateway control function entity controls the media gateway to temporarily maintain the second call branch as a media endpoint and the second party sends and receives RTCP messages.
  • the ICCF establishes a call connection between the terminal device and the second party by binding the circuit-switched call branch based on a new media type and the second call branch changed to a new media type.
  • the circuit switching network where the terminal device is located may be determined to support the SCUDIF feature before the step 704. If supported, the circuit-switched call branch based on the original media type is modified to be based on the SCUDIF feature. The circuit switched call branch of the new media type is described and proceeds to step 709. If not, proceed to step 704.
  • the difference between the sixth embodiment of the present invention and the third embodiment is that it is applicable to different call scenarios.
  • the initiator of the media change in the first embodiment is the terminal device.
  • Embodiment 7 is a method for call control, and a signaling flowchart is shown in FIG. 8 and includes:
  • the terminal device and the ICCF establish a circuit-switched call branch based on the original media type.
  • the step of the terminal device establishing a circuit-switched call branch based on the original media type to the ICCF is as follows: Step 204 of the circuit switched call branch.
  • the ICCF requests a second party to establish a second call branch based on the original media type.
  • the ICCF may request the second party to establish an original media based on sending an Invite message to the second party.
  • the second call branch of the type is a third party that specifies a third party to establish a third call branch based on the original media type.
  • the second direction, the ICCF, requests to change a media type, where the request includes a new one. media type;
  • the second party can return a request to change the media type by returning a response message to the Invite message to the ICCF.
  • the manner in which the request to change the media type is specifically returned may also be returned by other conventional messages, and the specific message does not constitute a limitation of the present invention.
  • Step 804. Release a circuit-switched call branch established by the terminal device and the ICCF.
  • the terminal device establishes a circuit-switched call branch based on the new media type with the ICCF.
  • the manner of establishing a circuit-switched call branch based on the new media type refer to step 204 of the first embodiment and the steps of the fifth embodiment. 505.
  • the ICCF establishes, with the second party, a second call branch based on the new media type.
  • the ICCF establishes the terminal device and the second party by binding the circuit-switched call branch based on the new media type established with the terminal device and the second call branch established with the second party. Call connection.
  • the seventh embodiment differs from the first embodiment and the fourth embodiment in that it is applicable to different call scenarios.
  • the terminal device requests
  • the second party requests to change a media type.
  • the media type change of the seventh embodiment is a change of the media type performed during the call setup process of the terminal device and the second party.
  • Embodiment 8 is a method for call control, and a signaling flowchart is shown in FIG. 8 and includes:
  • the terminal device and the ICCF establish a circuit-switched call branch based on the original media type.
  • the step of the terminal device establishing a circuit-switched call branch based on the original media type to the ICCF is performed according to the first embodiment.
  • the ICCF requests a second party to establish a second call branch based on the original media type.
  • the ICCF may request the second party to establish an original media based on sending an Invite message to the second party.
  • the second call branch of the type is a third party that specifies a third party to establish a third call branch based on the original media type.
  • the second direction requests to change a media type, where the request includes a new one. media type;
  • the second party can return a request to change the media type by returning a response message to the Invite message to the ICCF.
  • the manner in which the request to change the media type is specifically returned may also be returned by other conventional messages, and the specific message does not constitute a limitation of the present invention.
  • step 904. Determine whether the circuit switched network where the terminal device is located supports SCUDIF. If yes, proceed to step 905. If not, proceed to step 906.
  • Step 906 Release a circuit-switched call branch established by the terminal device and the ICCF.
  • Step 203 For releasing the circuit-switched call branch of the original media type established by the terminal device and the ICCF, refer to step 203 and the embodiment of the first embodiment. Step 504 of six.
  • the terminal device establishes a circuit-switched call branch based on the new media type with the ICCF.
  • a circuit-switched call branch based on the new media type For the manner of establishing a circuit-switched call branch based on the new media type, refer to step 204 of the first embodiment and the steps of the fifth embodiment. 505.
  • the ICCF establishes, with the second party, a second call branch based on the new media type.
  • the ICCF establishes the terminal device and the second party by binding the circuit-switched call branch based on the new media type established with the terminal device and the second call branch established with the second party. Call connection.
  • the eighth embodiment of the present invention differs from the seventh embodiment in that, according to the seventh embodiment, it is added whether the network supports the SCUDIF feature, and if the support can know that the CS switching network where the terminal device is located supports the media change,
  • the media type of the circuit switched call branch established by the terminal device and the ICCF may be changed to the new media type by using a media change mode supported by the R5, so that the media conversion speed is faster.
  • Embodiment 9 is a method for call control, and a signaling flowchart is shown in FIG. 10, including:
  • the terminal device communicates with the second party through the circuit-switched call branch established by the terminal device and the ICCF, and the second call branch established by the second party.
  • the MSC served by the terminal device changes a media type used by the terminal device to communicate with the second party. It can be understood that the MSC may trigger a call connection to reduce its session quality to release more resources when the network is overloaded or resource shortage, for example: changing the video media type to the voice media type. You can also restore the original media type after the network status returns to normal, for example: Change the video media type to the voice media type.
  • the MSC releases a circuit switched call branch established by the terminal device and the ICCF.
  • the process for the MSC to release the circuit switched call branch may be:
  • the MSC sends a request for releasing the call to the terminal device and the ICCF respectively;
  • the MSC Upon receiving the corresponding message from the terminal device and the ICCF, the MSC releases the circuit switched call branch.
  • the terminal device establishes, with the ICCF, a circuit switched call branch based on the new media type.
  • step 204 of the first embodiment The process of establishing a circuit switched call leg based on a new media type is described in step 204 of the first embodiment and step 505 of the fourth embodiment.
  • step 205 of the first embodiment The process of changing the media type of the second call leg to the new media type is described in step 205 of the first embodiment and step 505 of the fourth embodiment.
  • the ICCF establishes a call connection between the terminal device and the second party by binding the circuit-switched call branch based on a new media type and the second call branch changed to a new media type.
  • the difference between the ninth embodiment and the first embodiment and the fourth embodiment is that the ninth triggering change media type is triggered by the MSC serving the terminal device.
  • Embodiment 10 is a method for call control.
  • the signaling flowchart is as shown in FIG. 11.
  • the method includes: 1101, a circuit switched call branch and an ICCF and a second party established by the terminal device and the second party through the terminal device and the ICCF. Establishing a second call branch to make a call;
  • the MSC served by the terminal device changes a media type used by the terminal device to talk to the second party.
  • the MSC releases a circuit switched call point established by the terminal device and the ICCF. Branch
  • the process for the MSC to release the circuit switched call branch may be:
  • the MSC sends a request for releasing the call to the terminal device and the ICCF respectively;
  • the MSC Upon receiving the corresponding message from the terminal device and the ICCF, the MSC releases the circuit switched call branch.
  • the ICCF establishes a third call branch with the media resource device.
  • the ICCF binds the second call branch and the third call branch.
  • the media resource device and the second party send and receive RTCP messages by using the third call leg and the second call leg.
  • step 1104 to the step 1106 can also be replaced by: the ICCF notification media gateway control function entity controls the media gateway to temporarily send and receive RTCP messages as the media endpoint and the second party.
  • the terminal device establishes, with the ICCF, a circuit switched call branch based on the new media type.
  • step 204 of the first embodiment The process of establishing a circuit switched call leg based on a new media type is described in step 204 of the first embodiment and step 505 of the fourth embodiment.
  • step 205 of the first embodiment The process of changing the media type of the second call leg to the new media type is described in step 205 of the first embodiment and step 505 of the fourth embodiment.
  • the ICCF establishes a call connection between the terminal device and the second party by binding the circuit-switched call branch based on the new media type and the second call branch changed to a new media type.
  • the difference between the tenth embodiment and the ninth embodiment is that the third party replaces the terminal device with the second party to send and receive RTCP messages, thereby avoiding the ICCF in the process of re-establishing the CS call leg, because the reconstruction time is too long.
  • the third party replaces the terminal device with the second party to send and receive RTCP messages, thereby avoiding the ICCF in the process of re-establishing the CS call leg, because the reconstruction time is too long.
  • the stability of the second call leg when the CS branch is reconstructed is ensured, which makes the method of the embodiment more practical.
  • Embodiment 11 A method for call control, where the signaling process is as shown in FIG. 12, including: 1201, a circuit switched control channel (ICCC) and an IMS of a terminal device established by an ICCF The two parties conduct media consultations;
  • ICCC circuit switched control channel
  • IMS IMS of a terminal device established by an ICCF
  • the process by which the terminal device negotiates with the second party through the Circuit Switched Control Channel (ICCC) of the IMS established with the ICCF may be:
  • the terminal device establishes an IMS circuit switched control channel with the ICCF;
  • the terminal device sends, by using the circuit switched control channel of the IMS, the identity of the second party and the media type requesting the call connection with the second party to the ICCF;
  • the ICCF sends a session invitation message to the second party by using the identifier of the second party, where the session invitation message includes the media type;
  • the second direction the ICCF, returns a media type change request, where the request includes a new media type
  • the media type change request may be sent by using a temporary response message. It may be understood that the message carrying the media type change request may be multiple, and the specific message type and the message do not constitute a limitation of the present invention.
  • the ICCF returns the new media type to the terminal device through a circuit switched control channel of the IMS;
  • the terminal device returns an acknowledgement message to the ICCF via the circuit switched control channel of the IMS to accept the new media type;
  • the ICCF returns a media type change request acknowledgement message to the second party to confirm that the terminal device accepts the new media type.
  • the media type change request acknowledgement message can be acknowledged by a temporary response message.
  • the process of media negotiation by the terminal device through the circuit switched control channel of the IMS established with the ICCF and the second party may also be:
  • a session invitation of the second party receives, by the ICCF, a session invitation of the second party, where the session invitation includes an identity identifier of the terminal device and a media type that the second party requests to establish a call;
  • the ICCF establishes a circuit switched control channel with the IMS of the called terminal by using the identity identifier
  • the ICCF returns a media type change request to the second party, where the change request includes a new media type
  • the media type change request may be sent by using a temporary response message. It can be understood that the message carrying the media type change request may be multiple, and the specific message type and the message do not constitute a limitation of the present invention.
  • the media type change request acknowledgement message can be acknowledged by a temporary response message.
  • the ICCF notifies the called device that the called party accepts the new media type.
  • the ICCF can perform media negotiation with the second party through the ICCC proxy terminal device, and can adopt other multiple negotiation modes, and the terminal device and the second party can perform multiple negotiation through the ICCC.
  • the invention emphasizes that media negotiation is performed by the ICCC before the call is established, and the specific negotiation mode and the number of consultations do not constitute a limitation of the present invention.
  • the ICCF establishes, with the terminal device, a circuit switched call branch based on the negotiated media type.
  • step 204 of the first embodiment of the present invention For the step of establishing a circuit switched call branch, reference may be made to step 204 of the first embodiment of the present invention and step 505 of the fourth embodiment of the present invention.
  • the ICCF establishes, with the second party, a second call branch based on the negotiated media type.
  • the step 1202 and the step 1203 may be performed simultaneously, for example, according to different initiators of the calling party, and if the terminal device is the originator of the call, the terminal device first sends a circuit switch to the ICCF.
  • the ICCF establishes the second call branch of the ICCF and the second party after receiving the setup request, and after the second call branch is established, if the second party is The initiator of the call, the flow is reversed, the first direction, the second direction, the ICCF sends a request for establishing a second call branch, and after receiving the setup request, the ICCF establishes
  • the ICCF exchanges a call branch with the terminal device, and after the circuit-switched call branch is established, the ICCF returns an acknowledgement message to the second party to complete establishment of the second call branch.
  • the ICCF establishes a call connection between the terminal device and the second party by binding the circuit switched call leg established with the terminal device and the second call leg established with the second party.
  • the step 1204 can be performed to complete the binding of the call branch.
  • the binding process mainly includes implementing connection between the terminal device and the media of the second party.
  • the ICCF implements media negotiation with the second party through the ICCC, and establishes a call branch and an ICCF circuit exchanged between the terminal device and the ICCF, and a second call branch of the second party.
  • the negotiated media type is established, which avoids the inconsistency of the media types requested by the two parties in the call setup process in the prior art, and the circuit switched network does not support the change of the media type, resulting in failure of call setup and improvement.
  • the user experience experience makes the whole call setup process more optimized and reasonable.
  • the ICS session media changing device 1300 is shown in FIG. 13 and includes: a media type changing unit 1310 and a call branch binding unit 1320.
  • the media type changing unit 1310 is configured to: after the terminal device or the second party changes the media type used for the call, release the call branch based on the original media type established by the ICCF and the terminal device, and rebuild the ICCF Transmitting a call branch with the terminal device based on the new media type; and changing a media type of the second call branch established by the ICCF and the second party to the new media type;
  • a call branch binding unit 1320 configured to re-establish the terminal device by binding a call branch based on the new media type circuit switching established with the terminal device and the second call branch changed to a new media type The second party's call is connected.
  • an ICS session media changing device comprising: a media negotiation proxy unit 1410 and a call establishing unit 1420;
  • the media negotiation proxy unit 1410 is configured to control, by using a circuit switched control channel of the IMS, the terminal device to perform media negotiation with the second party;
  • a call establishing unit 1420 configured to establish a circuit-switched call branch of the ICCF and the terminal device based on the negotiated media type, and establish a second call branch of the ICCF and the second party based on the negotiated media type;
  • the call branch established with the terminal device and the established with the second party The call branch establishes a call connection between the terminal device and the second party.
  • Embodiment 14 is a terminal device 1500, and its logical structure is shown in FIG. 15, which includes: a media type changing unit 1510, a call branch reconstructing unit 1520;
  • the media type changing unit 1510 is configured to change a media type used for the second party call
  • the call branch reestablishing unit 1520 is configured to release, after the media type changing unit changes the media type, release the terminal device and the ICCF based on the a circuit switched call branch of the original media type; and establishing a circuit switched call leg of the terminal device and the ICCF based on the changed new media type.
  • a terminal device 1600 which is shown in FIG. 16, includes: a media negotiating unit 1610 and a call branch establishing unit 1620.
  • the media negotiating unit 1610 is configured to perform media negotiation with the second party by using an IMS circuit exchange control channel established with the ICCF;
  • the call branch establishing unit 1620 is configured to establish, with the ICCF, a circuit switched call branch based on a media type negotiated by the media.
  • Embodiment 16 is a schematic diagram of a logical structure of an ICS session media changing device 1700.
  • the receiving unit 1710 is configured to receive a media type change request sent by the terminal equipment mobile switching center or the second party, where the media type change request includes a new media type;
  • the media type changing unit 1720 is configured to: after the receiving unit 1710 receives the media type change request, release the circuit-switched call branch based on the original media type established by the ICCF and the terminal device, and reconstruct the ICCF and the terminal device based on the a circuit switching call branch of the new media type; and updating the media type of the ICCF and the second call branch of the second party to the new media type.
  • the ICS session media changing device further includes: a determining unit and a modifying unit, wherein the determining unit is configured to determine whether the circuit switched network where the terminal device is located supports the SCUDIF, and if not, the media type changing unit 1730 Release the call branch based on the original media type established by the ICCF and the terminal device; if yes, send the result to the modifying unit 1740;
  • the modifying unit is configured to modify, by using the SCUDIF, the circuit-switched call branch based on the original media type to a circuit-switched call branch based on the new media type, and indicate that the media type is changed
  • the unit 1730 updates the media type of the ICCF and the second call branch of the second party to the new media type.
  • Embodiment 17 is a device 1800 for establishing a call, and a logical structure diagram thereof is shown in FIG. 18, including: a call setup unit 1810, an update request receiving unit 1820, and a call update unit 1830.
  • the call establishing unit 1810 is configured to establish, by the ICCF, the terminal device to exchange the call branch based on the original media type, and request the second party to establish a second call branch based on the original media type;
  • An update request receiving unit 1820 configured to receive a change media type request sent by the second party, where the request includes a new media type
  • the call update unit 1830 is configured to: after the update request receiving unit 1820 receives the change media type request, release the circuit-switched call branch based on the original media type established by the ICCF and the terminal device, and establish the ICCF and the terminal The device is based on a circuit switched call leg of the new media type; and establishing a second call leg of the ICCF and the second party based on the new media type.
  • the device for establishing an update further includes: a determining unit and a modifying unit, where
  • the determining unit is configured to determine whether the circuit switched network where the terminal device is located supports the SCUDIF, and if not, instruct the call update unit 1830 to release the call branch based on the original media type established by the ICCF and the terminal device; Transmitting the result to the modifying unit 1850; the modifying unit, configured to modify the circuit-switched call branch based on the original media type to the circuit-switched call branch based on the new media type, and indicate the call by using the SCUDIF
  • the update unit 1830 establishes a second call leg of the ICCF and the second party based on the new media type.
  • the circuit switched call branch based on the original media type established by the terminal device and the ICCF is released, and the terminal device is re-established.
  • a circuit-switched call branch based on a new media type established by the ICCF, and establishing a call connection between the terminal device and the second party by binding the re-established circuit-switched call branch with the second call branch established by the ICCF and the second party Media type changes are implemented in IMS centralized service control calls established through circuit switching.
  • the embodiment of the present invention determines whether the circuit-switched network supports the SCUDIF feature. If the CS-switched network in which the terminal device is located supports the change of the media, the device can be changed by using the media change mode supported by the R5. The media type of the circuit switched call branch established by the ICCF is changed to the new media type, so that the media conversion speed is faster.
  • the RTCP message is sent and received by the third party instead of the terminal device, and the call branch of the ICCF and the second party is prevented from being re-established in the process of re-establishing the CS call leg.
  • the stability of the second call leg when reconstructing the CS branch is ensured, which makes the method of the embodiment more practical.
  • the ICCF implements media negotiation with the second party through the ICCC, and when the call branch and the ICCF of the terminal device and the ICCF circuit are established, and the second call branch of the second party is used,
  • the negotiated media type is established, which avoids the prior art in the call setup process, the two types of media requested by the call are not one, and the circuit switched network does not support the change of the media type, resulting in failure of call setup. It improves the user experience of the business and makes the whole call setup process more optimized and reasonable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)

Description

^^媒体变更方法、 呼叫建立更新方法及设备
本申请要求于 2007 年 5 月 31 日提交中国专利局、 申请号为 200710105296.3、 发明名称为"呼叫控制的方法和 IMS的电路交换控制装置及 终端设备"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
本发明涉及通信技术领域 IMS集中控制技术， 具体涉及一种 ICS会话媒 体变更方法、 呼叫建立更新、 ICS会话媒体变更装置、 呼叫建立更新的装置及 终端设备。
背景技术
目前，移动通信网络以电路交换 ( Circuit-Switched, CS )为主， 包括 GSM、
CDMA等。各运营商基于 CS网络建立了比较完善和丰富的业务平台， 其中移 动交换中心（MSC )负责呼叫路由和业务逻辑执行， 如呼叫前转业务， 呼叫保 持业务等等。
CS网络的业务提供需要漫游地 MSC的支持，对于新业务的引入不利。 IP 多媒体子系统（IP Multimedia Sub-system, IMS ) 于分组交换 ( Package- Switched, PS )的业务网络， 其业务提供与漫游地无关， 有利于新的多媒体业 务的引入。 IMS支持用户设备 UE通过各种分组交换接入网 （如： GPRS )接 入 IMS网络进行 IMS多媒体业务。
基于分组交换的 IMS网络是通信网络未来的发展趋势 ,但是 IMS网络也是 一个比较复杂的网络， 可以预见， 基于分组交换的 IMS网络的全面部署不会短 时间完成， 同时， 不可能所有的 CS网络用户短时间更换新的 IMS终端， CS网 络将会在较长的一段时间内与 IMS网络共存， 因此需要 CS网络与 IMS网络的同 时运营。
在向 IMS网络演进过程中 , 3GPP ( The 3rd Generation Partnership Project, 第三代伙伴计划）提出 IMS集中业务控制 （IMS Centralised Service, ICS )课 题， 要求实现用户设备 UE通过 CS网络承载语音或视频（Visual Phone, VP ) 媒体来建立 IMS呼叫， 同时， 削弱或去除 MSC中的业务处理逻辑； UE通过新 引入的 IMS的电路交换控制信道（ IMS CS Control Channel, ICCC )收发 IMS 呼叫相关的控制信令， ICCC可能通过非结构化补充业务数据 ( Unstructured Supplementary Service Data, USSD ) 消息 载， 称为： ICCC-cs; 或通过 PS承 载， 称为： ICCC-ps。
现有的一种通过 CS网络来建立 IMS集中业务控制呼叫的主叫流程包括： 步骤 101至步骤 104，终端设备与 IMS的电路交换控制单元（IMS CS Control Function, ICCF )建立 ICCC控制信道并通过所述控制信道将被叫方的号码发送 给所述 ICCF。 具体的：
步骤 101， 所述终端设备向所述 ICCF发送会话邀请（Invite ); 所述会话邀 请消息包含被叫方的电话号码，即第二方的号码。所述会话邀请可以通过 USSD 或 PS网络传输。
可以理解的是， 采取的 PS网络可以是 GPRS等分组接入网， 具体采取何种 方式传输可以根据用户终端开通的网络服务进行选择。
步骤 102， ICCF返回临时响应消息（ 183 )， 所述临时响应消息中可以包含
ICCF的号码。 所述 ICCF的号码也可以在所述终端设备预先进行配置， 则本步 骤则不必返回所述 ICCF的号码。
步骤 103 , 所述终端设备向所述 ICCF发送临时响应消息确认（ PRACK )消 步骤 104， 所述 ICCF返回 200OK对所述临时确认消息进行确认。
步骤 105， 所述终端设备与所述 ICCF建立电路交换呼叫分支（CS Call Leg ).
步骤 106， 所述 ICCF与所述被叫方建立第二呼叫分支；
步骤 107， 所述 ICCF通过绑定所述与终端设备建立的呼叫分支和所述与第 二方建立的呼叫分支建立所述终端设备与所述第二方的呼叫连接。
这里， ICCF可以看作是一个背靠背用户代理（ Back-to-Back-User-Agent , B2BUA )， 相当于两个用户设备 UE粘合在一起。 ICCF和所述终端设备之间建 立第一个呼叫分支 ,和被叫方建立第二个呼叫分支 ,这两个呼叫分支相对独立 , 当某一个呼叫分支被拆除， 另一个呼叫分支可以独立存在。 而所述第一个呼叫 分支的建立和所述第二个呼叫分支的建立可以相互触发，在建立的过程中， 实 现所述终端设备与第二方信令的交互和媒体的连接 ,实现所述终端设备与第二 方的通话。 IMS集中业务控制方式下实现通过 CS网络来建立 IMS呼叫的被叫流程和 上述的主叫流程相似， 此处不再赘述。
在对现有技术的研究和实践过程中 , 发明人发现现有技术存在以下问题： 以上现有的技术方案可以实现通过 CS网络来建立 IMS呼叫，但是在主被 叫进行通话或呼叫建立的过程中，经常会遇到主叫方或被叫方请求变换媒体类 型的情况， IMS允许呼叫进行中任意删除和添加各种媒体（语音， 视频， 文字 等）， 但是这种需求对于 CS网络来讲， 现有的大多数 CS网络的网络设备还不 支持在呼叫建立之后进行媒体类型的转换， 因此， 上述现有的在 IMS集中控 制方案下， 用户通过 CS与 IMS建立呼叫连接后， 由于当前 CS网络的局限性 不能更改呼叫的媒体类型， 降低用户的业务体验感受。 在 3GPP制定的版本 5 ( Release5, R5 )可以提供 CS网络在 ^舌过程中更改会话的媒体类型， 但是 需要对现有的 CS网络及其设备进行大范围的升级，升级成本巨大，难以推广。
发明内容
本发明实施例提供一种 IP多媒体子系统集中控制 ICS会话媒体变更方法、 呼叫建立更新、 ICS会话媒体变更装置、 呼叫建立更新的装置及终端设备， 能 够实现媒体类型的变更。
为此， 本发明实施例提供一种 ICS会话媒体变更方法， 包括：
接收终端设备或移动交换中心发送的媒体类型变更请求，所述媒体类型变 更请求包括新媒体类型； 释放电路交换控制单元 ICCF与终端设备基于原媒体 类型的电路交换呼叫分支； 建立所述 ICCF与所述终端设备基于新媒体类型的 电路交换呼叫分支； 更新所述 ICCF与第二方的第二呼叫分支的媒体类型为所 述新媒体类型； 或者
接收第二方发送的媒体类型变更请求 ,所述媒体类型变更请求包括新媒体 类型； 更新 ICCF与第二方的第二呼叫分支的媒体类型为所述新媒体类型； 释 放 ICCF与终端设备基于原媒体类型的电路交换呼叫分支； 建立所述 ICCF与 终端设备基于新媒体类型的电路交换呼叫分支。
本发明实施例提供一种呼叫建立更新的方法， 包括：
建立 ICCF与终端设备基于原媒体类型的电路交换呼叫分支； 向第二方请求建立基于所述原媒体类型的第二呼叫分支；
接收所述第二方发送的变更媒体类型请求， 所述请求中包括新媒体类型； 释放 ICCF与所述终端设备建立的电路交换呼叫分支；
建立 ICCF与所述终端设备基于新的媒体类型的电路交换呼叫分支； 建立 ICCF与所述第二方基于所述新媒体类型的第二呼叫分支
本发明实施例提供一种 ICS会话媒体变更方法， 包括：
通过建立的 IMS的电路交换控制信道控制终端设备和第二方的媒体协商； 建立 ICCF与所述终端设备基于协商后的媒体类型的电路交换呼叫分支； 建立 ICCF与所述第二方基于协商后的媒体类型的第二呼叫分支； 绑定所述与终端设备建立的电路交换呼叫分支和所述与第二方建立的第 二呼叫分支， 建立所述终端设备与所述第二方的呼叫连接。
相应的， 本发明实施例提供一种 ICS会话媒体变更装置， 包括： 接收单元，用于接收终端设备移动交换中心或第二方发送的媒体类型变更 请求， 所述媒体类型变更请求包括新媒体类型；
媒体类型变更单元， 用于在所述接收单元接收到媒体类型变更请求后，释 放所述 ICCF与终端设备建立的基于原媒体类型的电路交换呼叫分支， 重建所 述 ICCF与终端设备基于所述新的媒体类型的电路交换呼叫分支；并更新 ICCF 与第二方的第二呼叫分支的媒体类型为所述新媒体类型。
本发明实施例提供一种呼叫建立更新的装置， 包括：
呼叫建立单元， 用于建立 ICCF与终端设备基于原媒体类型的电路交换呼 叫分支， 并向第二方请求建立基于所述原媒体类型的第二呼叫分支；
更新请求接收单元， 用于接收所述第二方发送的变更媒体类型请求， 所述 请求中包括新媒体类型；
呼叫更新单元， 用于更新请求接收单元接收到变更媒体类型请求后，释放 所述 ICCF与所述终端设备建立的基于原媒体类型的电路交换呼叫分支， 并建 立所述 ICCF与所述终端设备基于新的媒体类型的电路交换呼叫分支； 以及建 立所述 ICCF与所述第二方基于所述新媒体类型的第二呼叫分支。
本发明实施例提供一种 ICS会话媒体变更装置 , 包括：
媒体协商代理单元， 用于通过 IMS的电路交换控制信道控制终端设备与 第二方进行媒体协商；
呼叫建立单元， 用于建立 ICCF与所述终端设备基于协商后的媒体类型的 电路交换呼叫分支， 建立 ICCF与所述第二方基于协商后的媒体类型的第二呼 叫分支；并通过绑定所述与终端设备建立的呼叫分支和所述与第二方建立的呼 叫分支， 建立所述终端设备与所述第二方的呼叫连接。
本发明实施例提供的一种终端设备， 包括：媒体类型变更单元和呼叫分支 重建单元； 其中
媒体类型变更单元， 用于变更与所述第二方通话使用的媒体类型； 呼叫分支重建单元， 用于在所述媒体类型变更单元变更媒体类型后，释放 该终端设备与 ICCF建立的基于原媒体类型的电路交换呼叫分支； 并建立该终 端设备与所述 ICCF基于所述变更后的新媒体类型的电路交换呼叫分支。
本发明实施例提供的一种终端设备， 包括：
媒体协商单元，用于通过与 ICCF建立的 IMS电路交换控制信道与第二方 进行媒体协商；
呼叫分支建立单元， 用于与所述 ICCF建立基于所述媒体协商后的媒体类 型的电路交换呼叫分支。
采用上述技术方案， 本发明实施例有益的技术效果在于：
本发明实施例在通过电路交换建立的 IMS集的业务控制呼叫中， 当触发 变更呼叫的媒体类型时， 则释放终端设备与 ICCF建立的基于原媒体类型的电 路交换呼叫分支， 重新建立终端设备与 ICCF建立的基于新媒体类型的电路交 换呼叫分支， 并通过绑定所述重新建立的电路交换呼叫分支与 ICCF与第二方 建立的第二呼叫分支建立终端设备与第二方的呼叫连接，实现了通过电路交换 建立的 IMS集中业务控制呼叫中实现媒体类型的变更。 因为在电路交换网络 采用了重建呼叫支路的机制， 与现有技术相比，可以降低对电路交换网络的要 求， 避免了现有技术方案中需要对现有的电路交换网络设备进行的大范围升 级， 降低了网络建设的成本， 通用性更强。
附图说明
图 1为现有技术通过 CS网络来建立 IMS集中业务控制呼叫的主叫流程 图； 图 2为本发明实施例一呼叫控制方法的流程图；
图 3为本发明实施例二呼叫控制方法的流程图；
图 4为本发明实施例三呼叫控制方法的流程图；
图 5为本发明实施例四呼叫控制方法的流程图；
图 6为本发明实施例五呼叫控制方法的流程图；
图 7为本发明实施例六呼叫控制方法的流程图；
图 8为本发明实施例七呼叫控制方法的流程图；
图 9为本发明实施例八呼叫控制方法的流程图；
图 10为本发明实施例九呼叫控制方法的流程图；
图 11为本发明实施例十呼叫控制方法的流程图；
图 12为本发明实施例十一呼叫控制方法的流程图；
图 13为本发明实施例十二 ICS 舌媒体变更装置的逻辑结构示意图； 图 14为本发明实施例十三 ICS会话媒体变更装置的逻辑结构示意图； 图 15为本发明实施例十四终端设备的逻辑结构示意图；
图 16为本发明实施例十五终端设备的逻辑结构示意图；
图 17为本发明实施例十六 ICS ^舌媒体变更装置的逻辑结构示意图； 图 18为本发明实施例十七呼叫建立更新的装置的逻辑结构示意图。
具体实施方式
本发明实施例提供了呼叫控制的方法和 IMS的电路交换控制装置及终端 设备， 能够实现通过电路交换建立的 IMS集中业务控制呼叫中实现媒体类型 的变更。 下面对本发明实施例提供的呼叫控制的方法和 IMS的电路交换控制 装置及终端设备进行详细描述。
实施例一， 一种呼叫控制的方法， 信令流程图如图 2所示， 包括： 201 , 终端设备与第二方通过所述终端设备与 ICCF建立的电路交换呼叫 分支和 ICCF与第二方建立的第二呼叫分支进行通话；
本发明实施例中 , 所述终端设备为可以基于电路交换进行通信的网络设 备， 例如： 可以是移动电话、 固定电话、 网络计算机和服务器等等； 所述第二 方包括与终端设备建立呼叫的对端终端设备及其所在的接入网络；该接入网络 可以是 PS接入网， 也可以是 CS接入网络， 本发明不做限定。 202, 所述终端设备变更与所述第二方通话使用的媒体类型；
本发明实施例中， 所述的媒体类型可以包括： 音频类型、视频类型和文件 类型等。
203 , 释放所述终端设备与所述 ICCF建立的所述基于原媒体类型的电路 交换呼叫分支；
本实施例中， 释放终端设备与 ICCF的电路交换呼叫分支可以由所述终端 设备发起， 例如： 释放电路交换呼叫支路的步骤包括：
所述终端设备向为其服务的 MSC发送呼叫拆除（Disconnect ) 消息； MSC向媒体网关控制器（MGCF )发送释放 ( REL ) 消息；
媒体网关控制器向 ICCF发送^舌拆除（BYE ) 消息；
ICCF向所述 MGCF返回对所述 BYE消息的确认 ( 200OK ) 消息。
MGCF向 MSC返回释放完成 ( REL COMP ) 消息；
MSC向所述终端设备返回释放 ( Release ) 消息， 确认呼叫支路已释放。 可以理解的是， 释放终端设备与 ICCF的电路交换呼叫分支还可以由所述 ICCF发起， 例如： 所述终端设备通过 ICCC通道将媒体类型变更请求发送给 ICCF, 所述 ICCF再发起释放与所述终端设备建立的电路交换呼叫分支的请 求。
204, 建立所述终端设备与所述 ICCF基于新的媒体类型的电路交换呼叫 分支；
本实施例中， 建立基于新的媒体类型的电路交换呼叫分支的步骤可以是： 终端设备向所述 MSC发送呼叫建立（Setup ) 消息； 所述 Setup消息包含 所述新的媒体类型；
所述 MSC向 MGCF发送初始地址 (IAM)消息；所述 IAM消息包含所述新 的媒体类型；
所述 MGCF向 ICCF发送会话邀请 ( Invite ) 消息， 所述 Invite消息中包 含新的媒体类型； 所述 MGCF在向所述 ICCF转发所述新的媒体类型时，可以 络相适应。
所述 ICCF接受所述 Invite消息，可以理解的是，所述 ICCF收到所述 Invite 消息，则可以触发本实施例步骤 205将第二呼叫分支的媒体类型变更为所述新 的媒体类型的步骤， 待所述第二呼叫分支的媒体类型变更为所述新的媒体类 型的步骤完成 , 所述 ICCF向 MGCF返回 200OK消息予以确认；
所述 MGCF向所述 MSC返回摘机应答（ ANM ) 消息；
所述 MSC向所述终端设备返回连接（Connect )消息， 电路交换呼叫分支 建立完成。
可以理解的是，步骤 204建立基于新的媒体类型的电路交换呼叫分支的步 骤也可以通过在所述 ICCF通过 ICCC收到所述终端设备的新的媒体类型 , 在 所述电路交换呼叫支路拆除后 , 由 ICCF重新发起建立基于新的媒体类型的电 路交换呼叫支路。
205 , 将第二呼叫分支的媒体类型变更为所述新的媒体类型；
本实施例中，可以通过 ICCF向所述第二方发送重新会话邀请 ( Re-Invite ) 消息或更新 ( Update ) 消息；
所述第二方向所述 ICCF返回所述 Re-Invite消息或所述 Update消息的响 应消息接受所述新的媒体类型。
可以理解的是，还可以通过重建所述第二呼叫支路的方式进行媒体类型的 变更， 如：
释放所述 ICCF与所述第二方基于原媒体类型的第二呼叫分支；
建立所述 ICCF与所述第二方基于新媒体类型的第二呼叫分支。
本实施例步骤 205和步骤 204并无绝对顺序， 步骤 205可以与步骤 204 建立基于新的媒体类型的呼叫分支时同时进行， 例如： 在 ICCF收到来自于媒 体网关控制器的 Invite消息后， 则可以触发步骤 205， 待第二分支的媒体类型 变更完成， 则 ICCF向所述终端设备返回确认消息， 确认电路交换的呼叫支路 建立完成。所述确认消息可以经过电路交换域的设备进行对应的转换使之可以 到达所述终端设备。
206, 所述 ICCF通过绑定所述基于新媒体类型的电路交换呼叫分支和所 述变更为新媒体类型的第二呼叫分支建立所述终端设备与所述第二方的呼叫 连接。
可以理解的是，所述绑定电路交换呼叫分支和所述第二呼叫分支可以在呼 叫分支的建立过程中进行绑定，绑定的过程主要包括实现所述终端设备和所述 第二方的媒体的连接。
本发明实施例一， 在通过电路交换建立的 IMS集中业务控制呼叫中， 当 触发变更呼叫的媒体类型时， 则释放终端设备与 ICCF建立的基于原媒体类型 的电路交换呼叫分支， 重新建立终端设备与 ICCF建立的基于新媒体类型的电 路交换呼叫分支， 并通过绑定所述重新建立的电路交换呼叫分支与 ICCF与第 二方建立的第二呼叫分支建立终端设备与第二方的呼叫连接，实现了通过电路 交换建立的 IMS集中业务控制呼叫中实现媒体类型的变更。 因为在电路交换 网络采用了重建呼叫支路的机制， 与现有技术相比，可以降低对电路交换网络 的要求 ,避免了现有技术方案中需要对现有的电路交换网络设备进行的大范围 升级， 降低了网络建设的成本， 通用性更强。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤 是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可 读存储介质中， 该程序在执行时， 包括如下步骤：
终端设备与第二方通过所述终端设备与 ICCF建立的电路交换呼叫分支和
ICCF与第二方建立的第二呼叫分支进行通话；
若所述终端设备变更与所述第二方通话使用的媒体类型 ,则释放所述终端 设备与所述 ICCF建立的所述基于原媒体类型的电路交换呼叫分支；
建立所述终端设备与所述 ICCF基于新的媒体类型的电路交换呼叫分支； 将第二呼叫分支的媒体类型变更为所述新的媒体类型；
所述 ICCF通过绑定所述基于新媒体类型的电路交换呼叫分支和所述变更 为新媒体类型的第二呼叫分支建立所述终端设备与所述第二方的呼叫连接。
上述提到的存储介质可以是只读存储器， 磁盘或光盘等。
本发明实施例二， 一种呼叫控制的方法， 信令流程图如图 3所示， 包括： 301 , 终端设备与第二方通过所述终端设备与 ICCF建立的电路交换呼叫 分支和 ICCF与第二方建立的第二呼叫分支进行通话；
302, 所述终端设备变更与所述第二方通话使用的媒体类型；
本发明实施例中， 所述的媒体类型可以包括： 音频类型、视频类型和文件 类型等。 303 , 判断所述终端设备所在的电路交换网络是否支持业务变更和非限制 数字信息业务回退（ Service Change and UDI Fallback, SCUDIF )特性， 如果 支持则继续步骤 304， 如果不支持则继续步骤 305。
304, 利用 SCUDIF特性将所述基于原媒体类型的电路交换呼叫分支修改 为基于所述新的媒体类型的电路交换呼叫分支并继续步骤 307。
305, 释放所述终端设备与所述 ICCF建立的所述基于原媒体类型的电路 交换呼叫分支；
306, 建立所述终端设备与所述 ICCF基于新的媒体类型的电路交换呼叫 分支；
307, 将第二呼叫分支的媒体类型变更为所述新的媒体类型。
308， 所述 ICCF通过绑定所述基于新媒体类型的电路交换呼叫分支和所 述变更为新媒体类型的第二呼叫分支建立所述终端设备与所述第二方的呼叫 连接。
本发明实施例二， 与实施例一的区别在于，在实施例一的基础上追加了判 断电路交换网络是否支持 SCUDIF特性，若支持可以得知所述终端设备所在的 CS交换网络支持媒体变更， 因此则可以采用 R5支持的媒体变更方式将所述 终端设备与所述 ICCF建立的电路交换呼叫分支的媒体类型变更为所述新的媒 体类型， 使媒体转换的速度更快。
本发明实施例三， 一种呼叫控制的方法， 信令流程图如图 4所示， 包括： 401 , 终端设备与第二方通过所述终端设备与 ICCF建立的电路交换呼叫 分支和 ICCF与第二方建立的第二呼叫分支进行通话；
402, 所述终端设备变更与所述第二方通话使用的媒体类型；
本发明实施例中， 所述的媒体类型可以包括： 音频类型、 视频类型、 文件 类型等。
403 , 释放所述终端设备与所述 ICCF建立的所述基于原媒体类型的电路 交换呼叫分支；
具体释放呼叫的步骤参照实施例一中的步骤 203。
404, 所述 ICCF与媒体资源设备（Media Resource Function, MRF )建立 第三呼叫分支； 405, 所述 ICCF绑定所述第二呼叫分支和所述第三呼叫分支；
406, 所述媒体资源设备和所述第二方通过所述第三呼叫分支和所述第二 呼叫分支收发实时传输控制协议 ( Real-time Transport Control Protocol, RTCP ) 消息。
由于 CS呼叫支路被释放， 第二方就收不到对实时传输协议 ( Real-time
Transport Protocol , RTP ) 的连接的进行控制的 RTCP消息， 因为 RTCP消息 是按一定时间间隔发送的， 若重建的基于新的媒体类型的 CS呼叫支路的时间 不是足够短， 一定时间未收到所述 RTCP消息， 会认为呼叫失败， 进而第二方 会主动中止和 ICCF的呼叫分支。 因此在释放 CS呼叫分支后， 为了保持 ICCF 与第二方建立的第二呼叫分支， 可以利用媒体资源设备与第二方建立呼叫连 接， 并收发 RTCP消息。
可以理解的是， 本实施例还可以采取 ICCF通知媒体网关控制功能实体控 制媒体网关暂时作为媒体端点和所述第二方收发 RTCP 消息的方式实现对第 二呼叫分支的保持。
407, 建立所述终端设备与所述 ICCF基于新的媒体类型的电路交换呼叫 分支；
408, 将第二呼叫分支的媒体类型变更为所述新的媒体类型。
本实施例通过 ICCF向所述第二方发送重新会话邀请 ( Re-Invite ) 消息或 更新 ( Update )消息； 所述第二方向所述 ICCF返回所述 Re-Invite消息或所述 Update消息的响应消息接受所述新的媒体类型， 实现媒体类型的变更。
409, 所述 ICCF通过绑定所述基于新媒体类型的电路交换呼叫分支和所 述变更为新媒体类型的第二呼叫分支建立所述终端设备与所述第二方的呼叫 连接。
本实施例中，还可以在步骤 403之前判断所述终端设备所在的电路交换网 络是否支持 SCUDIF特性， 如果支持， 则利用 SCUDIF特性将所述基于原媒 体类型的电路交换呼叫分支修改为基于所述新的媒体类型的电路交换呼叫分 支并继续步骤 408。 如果不支持则继续步骤 403。
本发明实施例三与实施例二的区别在于，通过第三方代替所述终端设备与 第二方收发 RTCP消息， 避免了在重新建立 CS呼叫支路的过程中， 由于重建 时间过长， 导致 ICCF与第二方的呼叫分支被释放的情况， 保证了在重建 CS 支路时， 第二呼叫支路的稳定性， 使本实施例方法的实用性更强。
实施例四， 一种呼叫控制的方法， 信令流程图如图 5所示， 包括：
501 , 终端设备与第二方通过所述终端设备与 ICCF建立的电路交换呼叫 分支和 ICCF与第二方建立的第二呼叫分支进行通话；
本发明实施例中 , 所述终端设备为可以基于电路交换进行通信的网络设 备， 例如： 可以是移动电话、 固定电话、 网络计算机和服务器等等； 所述第二 方包括与终端设备建立呼叫的对端终端设备及其所在的接入网络；该接入网络 可以是 PS接入网， 也可以是 CS接入网络， 本发明不做限定。
502, 第二方变更与所述终端设备通话使用的媒体类型；
本发明实施例中， 所述的媒体类型可以包括： 音频类型、视频类型和文件 类型等。
503 , 将所述第二呼叫分支的媒体类型变更为新的媒体类型；
本实施例中，所述将第二呼叫分支的媒体类型变更为所述新的媒体类型的 过程包括：
所述第二方向所述 ICCF发送包含所述新的媒体类型的 Re-Invite消息或 Update消息；
所述 ICCF向所述第二方返回所述 Re-Invite消息或 Update消息的响应消 息接受所述新的媒体类型。可以理解的是， 所述响应消息可以在步骤 505所述 终端设备与所述 ICCF之间的基于新的媒体类型的电路交换呼叫分支建立后返 回， 指示所述终端设备接受所述新的媒体类型。
可以理解的是，所述将第二呼叫分支的媒体类型变更为新的媒体类型的过 程还可以是：
释放所述 ICCF与所述第二方基于原媒体类型的第二呼叫分支；
建立所述 ICCF与所述第二方基于新媒体类型的第二呼叫分支。
504， 释放所述终端设备与所述 ICCF建立的所述基于原媒体类型的电路 交换呼叫分支；
本实施例中， 终端设备与 ICCF的电路交换呼叫分支可以由所述 ICCF发 起， 例如： 释放电路交换呼叫支路的步骤包括： ICCF向 MGCF发送会话拆除（ BYE ) 消息；
MGCF向为所述终端设备服务的 MSC发送 REL消息；
MSC向所述终端设备发送 Disconnect消息；
所述终端设备向所述 MSC返回释放（Release ) 消息， 确认呼叫支路已释 放。
MSC向 MGCF返回 REL COMP消息；
所述 MGCF向 ICCF返回对所述 BYE消息的确认 ( 200OK ) 消息 , 确认 呼叫分支已经拆除。
可以理解的是， 终端设备与 ICCF的电路交换呼叫分支还可以由所述终端 设备发起， 例如： 可以所述 ICCF通过 ICCC将媒体类型变更请求发送给所述 终端设备，所述终端设备再发起释放与所述终端设备建立的电路交换呼叫分支 的请求， 具体步骤参照实施例一的步骤 203。
505, 建立所述终端设备与所述 ICCF基于新的媒体类型的电路交换呼叫 分支；
本实施例中， 建立基于新的媒体类型的电路交换呼叫分支的步骤可以是：
ICCF向所述 MGCF发送会话邀请 ( Invite )消息， 所述 Invite消息中包含 新的媒体类型；
所述 MGCF接受所述 Invite消息 , MGCF向所述 MSC发送初始地址 (IAM) 消息；
所述 MSC向终端设备所述发送呼叫建立 （ Setup ) 消息；
所述终端设备向所述 MSC返回连接（Connect ) 消息， 进行确认。
所述 MSC向所述 MGCF返回摘机应答 ( ANM ) 消息；
MGCF向 ICCF返回 200OK消息予以确认； 电路交换呼叫分支建立完成。 可以理解的是，步骤 505建立基于新的媒体类型的电路交换呼叫分支的步 骤也可以是：
所述终端设备通过 ICCC接收所述 ICCF发送的新的媒体类型 , 在所述电 路交换呼叫支路拆除后 ,由所述终端设备重新发起建立基于新的媒体类型的电 路交换呼叫支路的步骤。
506, ICCF通过绑定所述基于新的媒体类型的电路交换呼叫分支和所述 变更为新的媒体类型的第二呼叫分支建立所述终端设备与所述第二方的呼叫 连接。
本发明实施例四与实施例一的区别在于，适用于不同的呼叫场景， 实施例 例一的媒体变更的发起方为所述终端设备。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤 是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可 读存储介质中， 该程序在执行时， 包括如下步骤：
终端设备与第二方通过所述终端设备与 ICCF建立的电路交换呼叫分支和 ICCF与第二方建立的第二呼叫分支进行通话；
所述第二方变更与所述终端设备通话使用的媒体类型 ,则将所述第二呼叫 分支的媒体类型变更为新的媒体类型；
释放所述终端设备与所述 ICCF建立的所述基于原媒体类型的电路交换呼 叫分支；
建立所述终端设备与所述 ICCF基于新的媒体类型的电路交换呼叫分支； 所述 ICCF通过绑定所述基于新的媒体类型的电路交换呼叫分支和所述变 更为新的媒体类型的第二呼叫分支建立所述终端设备与所述第二方的呼叫连 接。
上述提到的存储介质可以是只读存储器， 磁盘或光盘等。
实施例五， 一种呼叫控制的方法， 信令流程图如图 6所示， 包括：
601 , 终端设备与第二方通过所述终端设备与 ICCF建立的电路交换呼叫 分支和 ICCF与第二方建立的第二呼叫分支进行通话；
602, 所述第二方变更与所述终端设备通话使用的媒体类型；
603 , 将所述第二呼叫分支的媒体类型变更为新的媒体类型；
将所述第二呼叫分支的媒体类型变更为新的媒体类型的步骤参照实施例 四步骤 503。
604, 判断所述终端设备所在的电路交换网络是否支持 SCUDIF特性， 如 果支持则继续步骤 605， 如果不支持， 则继续步骤 606。
本实施例， 判断电路交换网络是否支持 SCUDIF特性可以由 ICCF判断也 可以有所述终端设备进行判断。
605, 利用 SCUDIF特性将所述基于原媒体类型的电路交换呼叫分支修改 为基于所述新的媒体类型的电路交换呼叫分支并继续步骤 608。
606， 释放所述终端设备与所述 ICCF建立的所述基于原媒体类型的电路 交换呼叫分支；
释放电路交换的呼叫分支的步骤参照步骤实施例四步骤 504。
607, 建立所述终端设备与所述 ICCF基于新的媒体类型的电路交换呼叫 分支；
建立电路交换呼叫分支的步骤参见实施例四， 步骤 505。
608, 所述 ICCF通过绑定所述基于新的媒体类型的电路交换呼叫分支和 所述变更为新的媒体类型的第二呼叫分支建立所述终端设备与所述第二方的 呼叫连接。
本发明实施例五与实施例二的区别在于， 适用于不同的呼叫场景， 实施例 例一的媒体变更的发起方为所述终端设备。
实施例六， 一种呼叫控制的方法， 信令流程图如图 7所示， 包括：
701 , 终端设备与第二方通过所述终端设备与 ICCF建立的电路交换呼叫 分支和 ICCF与第二方建立的第二呼叫分支进行通话；
702, 所述第二方变更与所述终端设备通话使用的媒体类型；
703 , 将所述第二呼叫分支的媒体类型变更为新的媒体类型；
本实施例中所述将第二呼叫分支的媒体类型变更为所述新的媒体类型的 过程包括：
所述第二方向所述 ICCF发送包含所述新的媒体类型的 Re-Invite消息或 Update消息；
所述 ICCF向所述第二方返回所述 Re-Invite消息或 Update消息的响应消 息接受所述新的媒体类型。
704, 释放所述终端设备与所述 ICCF建立的所述基于原媒体类型的电路 交换呼叫分支；
释放电路交换的呼叫分支的步骤参照步骤实施例四步骤 504。 705, 所述 ICCF与媒体资源设备建立第三呼叫分支；
706, 所述 ICCF绑定所述第二呼叫分支和所述第三呼叫分支；
707, 所述媒体资源设备和所述第二方通过所述第三呼叫分支和所述第二 呼叫分支收发 RTCP消息。
可以理解的是， 本实施例还可以采取 ICCF通知媒体网关控制功能实体 控制媒体网关暂时作为媒体端点和所述第二方收发 RTCP 消息的方式实现对 第二呼叫分支的保持。
708, 建立所述终端设备与所述 ICCF基于新的媒体类型的电路交换呼叫 分支；
建立电路交换呼叫分支的步骤参见实施例四， 步骤 505。
709, 所述 ICCF通过绑定所述基于新的媒体类型的电路交换呼叫分支和 所述变更为新的媒体类型的第二呼叫分支建立所述终端设备与所述第二方的 呼叫连接。
本实施例中，所述可以在步骤 704之前判断所述终端设备所在的电路交换 网络是否支持 SCUDIF特性 ,如果支持则 ,利用 SCUDIF特性将所述基于原媒 体类型的电路交换呼叫分支修改为基于所述新的媒体类型的电路交换呼叫分 支并继续步骤 709。 如果不支持则继续步骤 704。
本发明实施例六与实施例三的区别在于， 适用于不同的呼叫场景， 实施例 例一的媒体变更的发起方为所述终端设备。
实施例七， 一种呼叫控制的方法， 信令流程图如图 8所示， 包括：
801 , 终端设备与 ICCF建立基于原媒体类型的电路交换呼叫分支； 本实施例中， 所述终端设备向 ICCF建立基于原媒体类型的电路交换呼叫 分支的步骤参见实施例一的建立基于新媒体类型的电路交换呼叫分支的步骤 204。
802, 所述 ICCF向第二方请求建立基于所述原媒体类型的第二呼叫分支； 所述 ICCF可以通过向所述第二方发送 Invite消息向所述第二方请求建立 基于所述原媒体类型的第二呼叫分支。
803 , 所述第二方向所述 ICCF请求变更媒体类型， 所述请求中包含新的 媒体类型；
可以理解的是， 所述第二方可以通过向所述 ICCF返回对所述 Invite消息 的响应消息返回变更媒体类型的请求。具体返回变更媒体类型请求的方式还可 以采取其他常规的消息返回 , 具体的消息不构成对本发明的限制。
804, 释放所述终端设备与所述 ICCF建立的电路交换呼叫分支； 释放所述终端设备与所述 ICCF建立的基于原媒体类型的电路交换呼叫分 支的过程参见实施例一的步骤 203和实施例六的步骤 504。
805, 所述终端设备与 ICCF建立基于所述新的媒体类型的电路交换呼叫 分支；建立基于所述新的媒体类型的电路交换呼叫分支的方式参见实施例一的 步骤 204和实施例五的步骤 505。
806， 所述 ICCF与所述第二方建立基于所述新的媒体类型的第二呼叫分 支。
807, 所述 ICCF通过绑定所述与终端设备建立的基于新的媒体类型的电 路交换呼叫分支和所述与第二方建立的第二呼叫分支建立所述终端设备与所 述第二方的呼叫连接。
实施例七与实施例一和实施例四的区别在于， 适用于不同的呼叫场景， 实 施例一是在所述电路交换网络的终端设备与第二方进行通话的过程中 ,所述终 端设备请求变更媒体类型 ,实施例五是在所述电路交换网络的终端设备与第二 方进行通话的过程中， 所述第二方请求变更媒体类型。 实施例七的媒体类型变 更是在所述终端设备与所述第二方的呼叫建立过程中进行的媒体类型的变更。
实施例八， 一种呼叫控制的方法， 信令流程图如图 8所示， 包括：
901 , 终端设备与 ICCF建立基于原媒体类型的电路交换呼叫分支； 本实施例中， 所述终端设备向 ICCF建立基于原媒体类型的电路交换呼叫 分支的步骤参见实施例一的建立基于新媒体类型的电路交换呼叫分支的步骤 204。
902, 所述 ICCF向第二方请求建立基于所述原媒体类型的第二呼叫分支； 所述 ICCF可以通过向所述第二方发送 Invite消息向所述第二方请求建立 基于所述原媒体类型的第二呼叫分支。
903 , 所述第二方向所述 ICCF请求变更媒体类型， 所述请求中包含新的 媒体类型；
可以理解的是， 所述第二方可以通过向所述 ICCF返回对所述 Invite消息 的响应消息返回变更媒体类型的请求。具体返回变更媒体类型请求的方式还可 以采取其他常规的消息返回 , 具体的消息不构成对本发明的限制。
904, 判断所述终端设备所在的电路交换网络是否支持 SCUDIF, 如果支 持则继续步骤 905， 如果不支持， 则继续步骤 906。
905, 利用 SCUDIF特性将所述基于原媒体类型的电路交换呼叫分支修改 为基于所述新的媒体类型的电路交换呼叫分支并继续步骤 908。
906, 释放所述终端设备与所述 ICCF建立的电路交换呼叫分支； 释放所述终端设备与所述 ICCF建立的基于原媒体类型的电路交换呼叫分 支的过程参见实施例一的步骤 203和实施例六的步骤 504。
907, 所述终端设备与 ICCF建立基于所述新的媒体类型的电路交换呼叫 分支；建立基于所述新的媒体类型的电路交换呼叫分支的方式参见实施例一的 步骤 204和实施例五的步骤 505。
908, 所述 ICCF与所述第二方建立基于所述新的媒体类型的第二呼叫分 支。
909, 所述 ICCF通过绑定所述与终端设备建立的基于新的媒体类型的电 路交换呼叫分支和所述与第二方建立的第二呼叫分支建立所述终端设备与所 述第二方的呼叫连接。
本发明实施例八， 与实施例七的区别在于，在实施例七的基础上追加了判 断网络是否支持 SCUDIF特性， 若支持可以得知所述终端设备所在的 CS交换 网络支持媒体变更， 因此则可以采用 R5支持的媒体变更方式将所述终端设备 与所述 ICCF建立的电路交换呼叫分支的媒体类型变更为所述新的媒体类型 , 使媒体转换的速度更快。
实施例九， 一种呼叫控制的方法， 信令流程图如图 10所示， 包括：
1001 , 终端设备与第二方通过所述终端设备与 ICCF建立的电路交换呼叫 分支和 ICCF与第二方建立的第二呼叫分支进行通话；
1002， 所述终端设备服务的 MSC变更所述终端设备与所述第二方通话使 用的媒体类型； 可以理解的是， 所述 MSC在网络过载或资源紧缺时， 可能触发对某个呼 叫连接降低其会话质量以释放出更多的资源， 例如： 将视频媒体类型变更为语 音媒体类型。 也可以在网络状况回复正常后， 恢复原有的媒体类型， 例如： 将 视频媒体类型变更为语音媒体类型。
1003 , 所述 MSC释放所述终端设备与所述 ICCF建立的电路交换呼叫分 支；
本实施例中， MSC释放所述电路交换呼叫分支的过程可以是：
MSC向所述终端设备和 ICCF分别发出释放呼叫的请求；
MSC收到所述终端设备和 ICCF的相应消息，则释放所述电路交换的呼叫 分支。
1004， 所述终端设备与所述 ICCF建立基于所述新的媒体类型的电路交换 呼叫分支；
所述建立基于新的媒体类型的电路交换呼叫分支的过程参照实施例一的 步骤 204和实施例四的步骤 505。
1005, 将所述 ICCF与所述第二方建立的第二呼叫分支的媒体类型变更为 所述新的媒体类型；
将所述第二呼叫分支的媒体类型变更所述新的媒体类型的过程参见实施 例一的步骤 205和实施例四的步骤 505。
1006, 所述 ICCF通过绑定所述基于新的媒体类型的电路交换呼叫分支和 所述变更为新的媒体类型的第二呼叫分支建立所述终端设备与所述第二方的 呼叫连接。
实施例九与实施例一和实施例四的区别在于，实施例九触发变更媒体类型 是为终端设备服务的 MSC触发的。
实施例十， 一种呼叫控制的方法， 信令流程图如图 11所示， 包括： 1101 , 终端设备与第二方通过所述终端设备与 ICCF建立的电路交换呼叫 分支和 ICCF与第二方建立的第二呼叫分支进行通话；
1102, 所述终端设备服务的 MSC变更所述终端设备与所述第二方通话使 用的媒体类型；
1103 , 所述 MSC释放所述终端设备与所述 ICCF建立的电路交换呼叫分 支；
本实施例中， MSC释放所述电路交换呼叫分支的过程可以是：
MSC向所述终端设备和 ICCF分别发出释放呼叫的请求；
MSC收到所述终端设备和 ICCF的相应消息，则释放所述电路交换的呼叫 分支。
1104， 所述 ICCF与媒体资源设备建立第三呼叫分支；
1105, 所述 ICCF绑定所述第二呼叫分支和所述第三呼叫分支；
1106,所述媒体资源设备和所述第二方通过所述第三呼叫分支和所述第二 呼叫分支收发 RTCP消息。
可以理解的是， 所述步骤 1104至步骤 1106也可以替换为： 所述 ICCF通 知媒体网关控制功能实体控制媒体网关暂时作为媒体端点和所述第二方收发 RTCP消息。
1107, 所述终端设备与所述 ICCF建立基于所述新的媒体类型的电路交换 呼叫分支；
所述建立基于新的媒体类型的电路交换呼叫分支的过程参照实施例一的 步骤 204和实施例四的步骤 505。
1108, 将所述 ICCF与所述第二方建立的第二呼叫分支的媒体类型变更为 所述新的媒体类型；
将所述第二呼叫分支的媒体类型变更所述新的媒体类型的过程参见实施 例一的步骤 205和实施例四的步骤 505。
1109， 所述 ICCF通过绑定所述基于新的媒体类型的电路交换呼叫分支和 所述变更为新的媒体类型的第二呼叫分支建立所述终端设备与所述第二方的 呼叫连接。
本发明实施例十与实施例九的区别在于，通过第三方代替所述终端设备与 第二方收发 RTCP消息， 避免了在重新建立 CS呼叫支路的过程中， 由于重建 时间过长， 导致 ICCF与第二方的呼叫分支被释放的情况， 保证了在重建 CS 支路时， 第二呼叫支路的稳定性， 使本实施例方法的实用性更强。
实施例十一， 一种呼叫控制的方法， 信令流程如图 12所示， 包括： 1201 ,终端设备通过与 ICCF建立的 IMS的电路交换控制信道 (ICCC)和第 二方进行媒体协商；
终端设备通过与 ICCF建立的 IMS的电路交换控制信道 (ICCC)和第二方进 行媒体协商的过程可以是：
所述终端设备与 ICCF建立 IMS的电路交换控制信道；
所述终端设备通过所述 IMS的电路交换控制信道将第二方的身份标识和 请求与所述第二方建立呼叫连接的媒体类型发送给所述 ICCF;
所述 ICCF通过所述第二方的身份标识向所述第二方发送会话邀请消息， 所述会话邀请消息包含所述媒体类型；
所述第二方向所述 ICCF返回媒体类型变更请求， 所述请求中包含新的媒 体类型；
本实施例中， 所述媒体类型变更请求可以通过临时响应消息发送， 可以理 解的是， 所述承载媒体类型变更请求的消息可以有多种，具体的消息类型和消 息合格不构成对本发明限制。
所述 ICCF通过所述 IMS的电路交换控制信道将所述新的媒体类型返回给 所述终端设备；
所述终端设备通过所述 IMS的电路交换控制信道向所述 ICCF返回确认消 息接受所述新的媒体类型；
所述 ICCF向所述第二方返回媒体类型变更请求确认消息， 确认所述终端 设备接受所述新的媒体类型。
可以理解的是，所述媒体类型变更请求确认消息可以通过临时响应确认消 息承载。
终端设备通过与 ICCF建立的 IMS的电路交换控制信道和第二方进行媒体 协商的过程还可以是：
所述 ICCF收到所述第二方的会话邀请， 所述会话邀请包含所述终端设备 的身份标识和所述第二方请求建立呼叫的媒体类型；
所述 ICCF通过所述身份标识建立与所述被叫终端的 IMS的电路交换控制 信道；
所述 ICCF通过所述 IMS的电路交换控制信道将所述媒体类型发送给所述 终端设备； 所述终端设备通过所述 IMS的电路交换控制信道向所述 ICCF发送媒体类 型变更请求， 所述变更请求中包含新的媒体类型；
所述 ICCF向所述第二方返回媒体类型变更请求， 所述变更请求中包含新 的媒体类型；
此处，所述媒体类型变更请求可以通过临时响应消息发送，可以理解的是， 所述承载媒体类型变更请求的消息可以有多种，具体的消息类型和消息合格不 构成对本发明限制。
所述第二方向所述 ICCF返回媒体类型变更请求确认消息接受所述新的媒 体类型；
可以理解的是，所述媒体类型变更请求确认消息可以通过临时响应确认消 息承载。
所述 ICCF通知所述终端设备被叫方接受所述新的媒体类型。
可以理解的是， 所述 ICCF通过 ICCC代理终端设备与第二方进行媒体协 商还可以采取其他多种协商方式， 并且所述终端设备和所述第二方可以通过 ICCC通过进行多次协商， 本发明强调的是在呼叫建立之前， 通过 ICCC进行 媒体协商 , 具体的协商方式合协商次数不构成对本发明的限制。
1202, 所述 ICCF与所述终端设备建立基于协商后的媒体类型的电路交换 呼叫分支；
所述建立电路交换呼叫分支的步骤可以参考本发明实施例一的步骤 204 和本发明实施例四的步骤 505。
1203 , 所述 ICCF与所述第二方建立基于协商后的媒体类型的第二呼叫分 支；
本实施例， 所述步骤 1202和步骤 1203 , 可以同时进行， 例如才 据主叫的 发起方不同，假设所述终端设备为呼叫的发起方， 则首先所述终端设备向所述 ICCF发送电路交换呼叫分支的建立请求， 所述 ICCF收到所述建立请求后， 建立所述 ICCF与所述第二方的第二呼叫分支，所述第二呼叫分支建立完成后， 若所述第二方为呼叫的发起方， 则流程正好相反， 所述首先所述第二方向所述 ICCF发送第二呼叫分支的建立请求， 所述 ICCF收到所述建立请求后， 建立 所述 ICCF与所述终端设备的电路交换呼叫分支， 所述电路交换呼叫分支建立 完成后，所述 ICCF向所述第二方返回确认消息完成所述第二呼叫分支的建立。
1204, 所述 ICCF通过绑定所述与终端设备建立的电路交换呼叫分支和所 述与第二方建立的第二呼叫分支建立所述终端设备与所述第二方的呼叫连接。
在上述呼叫建立的过程中，可以进行所述步骤 1204完成呼叫分支的绑定， 绑定的过程主要包括实现所述终端设备和所述第二方的媒体的连接。
本发明实施例十一通过在呼叫建立之前， 实现 ICCF通过 ICCC与第二方 进行媒体协商， 在建立终端设备与 ICCF电路交换的呼叫分支和 ICCF与第二 方的第二呼叫分支时， 均采用所述协商后的媒体类型建立，避免了现有技术中 在呼叫建立过程中，呼叫的双方请求的媒体类型不一致， 而电路交换网络又不 支持媒体类型的更改， 导致的呼叫建立的失败， 提高了用户的业务体验感受， 使整个呼叫建立的过程更加优化并且合理。
实施例十二， 一种 ICS会话媒体变更装置 1300, 其逻辑结构示意图如图 13所示， 包括： 媒体类型变更单元 1310和呼叫分支绑定单元 1320。
所述媒体类型变更单元 1310, 用于在所述终端设备或所述第二方变更通 话使用的媒体类型后， 释放所述 ICCF与终端设备建立的基于原媒体类型的呼 叫分支， 重建所述 ICCF与终端设备基于所述新的媒体类型的电路交换呼叫分 支； 并将 ICCF与第二方建立的第二呼叫分支的媒体类型变更为所述新的媒体 类型；
呼叫分支绑定单元 1320， 用于通过绑定与终端设备建立的基于所述新的 媒体类型电路交换的呼叫分支和所述变更为新的媒体类型的第二呼叫分支重 新建立所述终端设备与所述第二方的呼叫连接。
实施例十三， 一种 ICS会话媒体变更装置， 其逻辑结构示意图如图 14所 示， 包括：媒体协商代理单元 1410和呼叫建立单元 1420;
媒体协商代理单元 1410, 用于通过 IMS的电路交换控制信道控制终端设 备与第二方进行媒体协商；
呼叫建立单元 1420，用于建立 ICCF与所述终端设备基于协商后的媒体类 型的电路交换呼叫分支， 建立 ICCF与所述第二方基于协商后的媒体类型的第 二呼叫分支；并通过绑定所述与终端设备建立的呼叫分支和所述与第二方建立 的呼叫分支建立所述终端设备与所述第二方的呼叫连接。
实施例十四，一种终端设备 1500，其逻辑结构示意图如图 15所示， 包括： 媒体类型变更单元 1510、 呼叫分支重建单元 1520;
媒体类型变更单元 1510, 用于变更与所述第二方通话使用的媒体类型； 呼叫分支重建单元 1520, 用于在所述媒体类型变更单元变更媒体类型后， 释放该终端设备与 ICCF建立的基于原媒体类型的电路交换呼叫分支； 并建立 该终端设备与所述 ICCF基于所述变更后的新的媒体类型的电路交换呼叫分 支。
实施例十五，一种终端设备 1600，其逻辑结构示意图如图 16所示， 包括： 媒体协商单元 1610和呼叫分支建立单元 1620。
媒体协商单元 1610, 用于通过与 ICCF建立的 IMS电路交换控制信道与 第二方进行媒体协商；
呼叫分支建立单元 1620，用于与所述 ICCF建立基于所述媒体协商后的媒 体类型的电路交换呼叫分支。
实施例十六， 一种 ICS会话媒体变更装置 1700, 其逻辑结构示意图如图
17所示， 包括： 接收单元 1710和媒体类型变更单元 1720。
接收单元 1710, 用于接收终端设备移动交换中心或第二方发送的媒体类 型变更请求， 所述媒体类型变更请求包括新媒体类型；
媒体类型变更单元 1720, 用于在所述接收单元 1710接收到媒体类型变更 请求后， 释放所述 ICCF与终端设备建立的基于原媒体类型的电路交换呼叫分 支， 重建所述 ICCF与终端设备基于所述新的媒体类型的电路交换呼叫分支； 并更新 ICCF与第二方的第二呼叫分支的媒体类型为所述新媒体类型。
所述 ICS会话媒体变更装置还包括： 判断单元和修改单元， 其中， 所述判断单元， 用于判断所述终端设备所在的电路交换网络是否支 SCUDIF, 若不支持， 则指示媒体类型变更单元 1730释放所述 ICCF与终端设 备建立的基于原媒体类型的呼叫分支； 若支持， 则将结果发送给修改单元 1740;
所述修改单元，用于利用所述 SCUDIF将所述基于原媒体类型的电路交换 呼叫分支修改为基于所述新媒体类型的电路交换呼叫分支，并指示媒体类型变 更单元 1730更新 ICCF与第二方的第二呼叫分支的媒体类型为所述新媒体类 型。
实施例十七， 一种呼叫建立更新的装置 1800, 其逻辑结构示意图如图 18 所示，包括：呼叫建立单元 1810、更新请求接收单元 1820和呼叫更新单元 1830。
呼叫建立单元 1810，用于建立 ICCF与终端设备基于原媒体类型的电路交 换呼叫分支， 并向第二方请求建立基于所述原媒体类型的第二呼叫分支；
更新请求接收单元 1820, 用于接收所述第二方发送的变更媒体类型请求， 所述请求中包括新媒体类型；
呼叫更新单元 1830 , 用于更新请求接收单元 1820接收到变更媒体类型请 求后， 释放所述 ICCF与所述终端设备建立的基于原媒体类型的电路交换呼叫 分支， 并建立所述 ICCF与所述终端设备基于新的媒体类型的电路交换呼叫分 支； 以及建立所述 ICCF与所述第二方基于所述新媒体类型的第二呼叫分支。
所述叫建立更新的装置还包括： 判断单元和修改单元， 其中，
所述判断单元， 用于判断所述终端设备所在的电路交换网络是否支 SCUDIF, 若不支持， 则指示呼叫更新单元 1830释放所述 ICCF与终端设备建 立的基于原媒体类型的呼叫分支； 若支持， 则将结果发送给修改单元 1850; 所述修改单元，用于利用所述 SCUDIF将所述基于原媒体类型的电路交换 呼叫分支修改为基于所述新媒体类型的电路交换呼叫分支，并指示呼叫更新单 元 1830建立所述 ICCF与所述第二方基于所述新媒体类型的第二呼叫分支。
以上对本发明所提供的呼叫控制的方法和 IMS的电路交换控制装置及终 端设备进行了详细介绍， 其中：
本发明实施例，在通过电路交换建立的 IMS集中业务控制呼叫中，当触发 变更呼叫的媒体类型时， 则释放终端设备与 ICCF建立的基于原媒体类型的电 路交换呼叫分支， 重新建立终端设备与 ICCF建立的基于新媒体类型的电路交 换呼叫分支， 并通过绑定所述重新建立的电路交换呼叫分支与 ICCF与第二方 建立的第二呼叫分支建立终端设备与第二方的呼叫连接，实现了通过电路交换 建立的 IMS集中业务控制呼叫中实现媒体类型的变更。 因为在电路交换网络 采用了重建呼叫支路的机制， 与现有技术相比，可以降低对电路交换网络的要 求 , 避免了现有技术方案中需要对现有的电路交换网络设备进行的大范围升 级， 降低了网络建设的成本， 通用性更强。
进一步，本发明实施例判断电路交换网络是否支持 SCUDIF特性，若支持 可以得知所述终端设备所在的 CS 交换网络支持媒体变更， 因此则可以采用 R5支持的媒体变更方式将所述终端设备与所述 ICCF建立的电路交换呼叫分 支的媒体类型变更为所述新的媒体类型， 使媒体转换的速度更快。
本发明实施例还通过第三方代替所述终端设备与第二方收发 RTCP消息 , 避免了在重新建立 CS呼叫支路的过程中， 由于重建时间过长， 导致 ICCF与 第二方的呼叫分支被释放的情况， 保证了在重建 CS支路时， 第二呼叫支路的 稳定性， 使本实施例方法的实用性更强。
并且， 本发明实施例通过在呼叫建立之前， 实现 ICCF通过 ICCC与第二 方进行媒体协商， 在建立终端设备与 ICCF电路交换的呼叫分支和 ICCF与第 二方的第二呼叫分支时， 均采用所述协商后的媒体类型建立，避免了现有技术 中在呼叫建立过程中，呼叫的双方请求的媒体类型不一支， 而电路交换网络又 不支持媒体类型的更改，导致的呼叫建立的失败,提高了用户的业务体验感受， 使整个呼叫建立的过程更加优化并且合理。
对于本领域的一般技术人员，依据本发明实施例的思想，在具体实施方式 及应用范围上均会有改变之处， 综上所述，本说明书内容不应理解为对本发明 的限制。

Claims

权 利 要 求
1. 一种 IP多媒体子系统集中控制 ICS ^舌媒体变更方法， 其特征在于， 包括：
接收终端设备或移动交换中心发送的媒体类型变更请求，所述媒体类型变 更请求包括新媒体类型； 释放电路交换控制单元 ICCF与终端设备基于原媒体 类型的电路交换呼叫分支； 建立所述 ICCF与所述终端设备基于新媒体类型的 电路交换呼叫分支； 更新所述 ICCF与第二方的第二呼叫分支的媒体类型为所 述新媒体类型； 或者
接收第二方发送的媒体类型变更请求 ,所述媒体类型变更请求包括新媒体 类型； 更新 ICCF与第二方的第二呼叫分支的媒体类型为所述新媒体类型； 释 放 ICCF与终端设备基于原媒体类型的电路交换呼叫分支； 建立所述 ICCF与 终端设备基于新媒体类型的电路交换呼叫分支。
2. 如权利要求 1所述的 ICS会话媒体变更方法， 其特征在于， 所述释放 ICCF与终端设备建立基于原媒体类型的电路交换呼叫分支之前包括：
判断所述终端设备所在的电路交换网络是否支持业务变更和非限制数字 信息业务回退 SCUDIF, 如果不支持， 则执行所述释放 ICCF与终端设备基于 原媒体类型的电路交换呼叫分支的步骤； 若支持， 则利用所述 SCUDIF将所述 基于原媒体类型的电路交换呼叫分支修改为基于所述新媒体类型的电路交换 呼叫分支， 并执行所述更新 ICCF与第二呼叫分支的媒体类型变更为所述新的 媒体类型的步骤。
3. 如权利要求 1所述的 ICS会话媒体变更方法， 其特征在于， 所述更新 ICCF与第二呼叫分支的媒体类型变更为所述新媒体类型的过程包括：
ICCF向所述第二方发送包括所述新媒体类型的重新会话邀请消息或更新 消息；
所述第二方向所述 ICCF返回所述重新会话邀请消息或所述更新消息的响 应消息 , 该响应消息中包括接受所述新媒体类型。
4. 如权利要求 1 所述的 ICS会话媒体变更方法， 其特征在于， 所述释 放 ICCF与终端设备基于原媒体类型的电路交换呼叫分支之后包括： 所述 ICCF与媒体资源设备建立第三呼叫分支；
所述 ICCF绑定所述第二呼叫分支和所述第三呼叫分支；
所述媒体资源设备和所述第二方通过所述第三呼叫分支和所述第二呼叫 分支收发实时传输控制协议 RTCP消息。
5. 如权利要求 1所述的 ICS会话媒体变更方法， 其特征在于， 所述释放
ICCF与终端设备基于原媒体类型的电路交换呼叫分支之后包括：
所述 ICCF通知媒体网关控制功能实体控制媒体网关暂时作为媒体端点和 所述第二方收发 RTCP消息。
6. 如权利要求 1所述的 ICS会话媒体变更方法， 其特征在于， 所述更新 ICCF与第二呼叫分支的媒体类型变更为所述新的媒体类型的过程包括：
ICCF释放与所述第二方基于原媒体类型的第二呼叫分支；
ICCF建立与所述第二方基于新媒体类型的第二呼叫分支。
7. 一种呼叫建立更新的方法， 其特征在于， 包括：
建立 ICCF与终端设备基于原媒体类型的电路交换呼叫分支；
向第二方请求建立基于所述原媒体类型的第二呼叫分支；
接收所述第二方发送的变更媒体类型请求， 所述请求中包括新媒体类型； 释放 ICCF与所述终端设备建立的电路交换呼叫分支；
建立 ICCF与所述终端设备基于新的媒体类型的电路交换呼叫分支； 建立 ICCF与所述第二方基于所述新媒体类型的第二呼叫分支。
8.如权利要求 7所述的呼叫建立更新的方法，其特征在于， 所述释放 ICCF 与述终端设备建立的电路交换呼叫分支之前包括：
判断所述终端设备所在的电路交换网络是否支持 SCUDIF, 如果不支持， 则执行所述释放与终端设备建立的电路交换呼叫分支的步骤； 如果支持， 则利 用所述 SCUDIF 将所述基于原媒体类型的电路交换呼叫分支修改为基于所述 新的媒体类型的电路交换呼叫分支， 并执行所述建立 ICCF与所述第二方基于 所述新媒体类型的第二呼叫分支的步骤。
9. 一种 ICS ^舌媒体变更方法， 其特征在于， 包括：
通过建立的 IMS的电路交换控制信道控制终端设备和第二方的媒体协商； 建立 ICCF与所述终端设备基于协商后的媒体类型的电路交换呼叫分支； 建立 ICCF与所述第二方基于协商后的媒体类型的第二呼叫分支； 绑定所述与终端设备建立的电路交换呼叫分支和所述与第二方建立的第 二呼叫分支， 建立所述终端设备与所述第二方的呼叫连接。
10. 如权利要求 9所述的 ICS会话媒体变更方法， 其特征在于， 通过建立 的 IMS的电路交换控制信道控制终端设备和第二方的媒体协商包括：
所述终端设备与 ICCF建立 IMS的电路交换控制信道；
所述终端设备通过所述 IMS的电路交换控制信道将第二方的身份标识和 请求与所述第二方建立呼叫连接的媒体类型发送给所述 ICCF;
所述 ICCF通过所述第二方的身份标识向所述第二方发送会话邀请消息， 所述会话邀请消息包括所述媒体类型；
所述第二方向所述 ICCF返回媒体类型变更请求， 所述请求中包括新媒体 类型；
所述 ICCF通过所述 IMS的电路交换控制信道将所述新媒体类型返回给所 述终端设备；
所述终端设备通过所述 IMS的电路交换控制信道向所述 ICCF返回确认消 息， 所述响应消息包括接受所述新媒体类型；
所述 ICCF向所述第二方返回媒体类型变更请求确认消息， 确认所述终端 设备接受所述新的媒体类型。
11. 如权利要求 9所述的 ICS会话媒体变更方法， 其特征在于， 通过建立 的 IMS的电路交换控制信道控制终端设备和第二方进行媒体协商包括：
ICCF收到所述第二方的会话邀请， 所述会话邀请包括所述终端设备的身 份标识和所述第二方请求建立呼叫的媒体类型；
所述 ICCF通过所述身份标识建立与所述被叫终端的 IMS的电路交换控制 信道；
所述 ICCF通过所述 IMS的电路交换控制信道将所述媒体类型发送给所述 终端设备；
所述终端设备通过所述 IMS的电路交换控制信道向所述 ICCF发送媒体类 型变更请求， 所述变更请求中包括新媒体类型；
所述 ICCF向所述第二方返回媒体类型变更请求， 所述变更请求中包括新 媒体类型；
所述第二方向所述 ICCF返回媒体类型变更请求确认消息， 所述确认消息 包括接受所述新媒体类型；
所述 ICCF通知所述终端设备被叫方接受所述新媒体类型。
12. 一种 ICS ^舌媒体变更装置， 其特征在于， 包括：
接收单元，用于接收终端设备移动交换中心或第二方发送的媒体类型变更 请求， 所述媒体类型变更请求包括新媒体类型；
媒体类型变更单元， 用于在所述接收单元接收到媒体类型变更请求后，释 放所述 ICCF与终端设备建立的基于原媒体类型的电路交换呼叫分支， 重建所 述 ICCF与终端设备基于所述新的媒体类型的电路交换呼叫分支；并更新 ICCF 与第二方的第二呼叫分支的媒体类型为所述新媒体类型。
13. 根据权利要求 12所述 ICS会话媒体变更装置， 其特征在于， 还包括： 判断单元和修改单元， 其中，
所述判断单元， 用于判断所述终端设备所在的电路交换网络是否支 SCUDIF, 若不支持， 则指示媒体类型变更单元释放所述 ICCF与终端设备建 立的基于原媒体类型的呼叫分支； 若支持， 则将结果发送给修改单元；
所述修改单元，用于利用所述 SCUDIF将所述基于原媒体类型的电路交换 呼叫分支修改为基于所述新媒体类型的电路交换呼叫分支，并指示媒体类型变 更单元更新 ICCF与第二方的第二呼叫分支的媒体类型为所述新媒体类型。
14. 一种呼叫建立更新的装置， 其特征在于， 包括：
呼叫建立单元， 用于建立 ICCF与终端设备基于原媒体类型的电路交换呼 叫分支， 并向第二方请求建立基于所述原媒体类型的第二呼叫分支；
更新请求接收单元， 用于接收所述第二方发送的变更媒体类型请求， 所述 请求中包括新媒体类型；
呼叫更新单元， 用于更新请求接收单元接收到变更媒体类型请求后，释放 所述 ICCF与所述终端设备建立的基于原媒体类型的电路交换呼叫分支， 并建 立所述 ICCF与所述终端设备基于新的媒体类型的电路交换呼叫分支； 以及建 立所述 ICCF与所述第二方基于所述新媒体类型的第二呼叫分支。
15. 根据权利要求 14所述呼叫建立更新的装置， 其特征在于， 还包括： 判断单元和修改单元， 其中，
所述判断单元， 用于判断所述终端设备所在的电路交换网络是否支 SCUDIF, 若不支持， 则指示呼叫更新单元释放所述 ICCF与终端设备建立的 基于原媒体类型的呼叫分支； 若支持， 则将结果发送给修改单元；
所述修改单元，用于利用所述 SCUDIF将所述基于原媒体类型的电路交换 呼叫分支修改为基于所述新媒体类型的电路交换呼叫分支，并指示呼叫更新单 元建立所述 ICCF与所述第二方基于所述新媒体类型的第二呼叫分支。
16. 一种 ICS会话媒体变更装置， 其特征在于， 包括：
媒体协商代理单元， 用于通过 IMS的电路交换控制信道控制终端设备与 第二方进行媒体协商；
呼叫建立单元， 用于建立 ICCF与所述终端设备基于协商后的媒体类型的 电路交换呼叫分支， 建立 ICCF与所述第二方基于协商后的媒体类型的第二呼 叫分支；并通过绑定所述与终端设备建立的呼叫分支和所述与第二方建立的呼 叫分支， 建立所述终端设备与所述第二方的呼叫连接。
17. 一种终端设备， 其特征在于， 包括： 媒体类型变更单元和呼叫分支重 建单元； 其中，
媒体类型变更单元， 用于变更与所述第二方通话使用的媒体类型； 呼叫分支重建单元， 用于在所述媒体类型变更单元变更媒体类型后，释放 该终端设备与 ICCF建立的基于原媒体类型的电路交换呼叫分支； 并建立该终 端设备与所述 ICCF基于所述变更后的新媒体类型的电路交换呼叫分支。
18. 一种终端设备， 其特征在于， 包括：
媒体协商单元，用于通过与 ICCF建立的 IMS电路交换控制信道与第二方 进行媒体协商；
呼叫分支建立单元， 用于与所述 ICCF建立基于所述媒体协商后的媒体类 型的电路交换呼叫分支。
PCT/CN2008/071017 2007-05-31 2008-05-20 Procédé servant à convertir des supports de conversation, procédé et dispositif servant à mettre à jour l'établissement d'un appel WO2008145051A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP08748623A EP2056618B1 (en) 2007-05-31 2008-05-20 Method for converting conversation media, method and device for updating calling establishment
AT08748623T ATE516675T1 (de) 2007-05-31 2008-05-20 Verfahren zur umformung von konversationsmedien, verfahren und gerät zum aktualisieren von rufeinrichtung
US12/424,976 US8588211B2 (en) 2007-05-31 2009-04-16 Method for changing session media, method for establishing a call, and equipment thereof
US13/542,196 US8515053B2 (en) 2007-05-31 2012-07-05 Method for changing session media, method for establishing a call, and equipment thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200710105296.3 2007-05-31
CN200710105296.3A CN101316435B (zh) 2007-05-31 2007-05-31 呼叫控制的方法和ims的电路交换控制装置及终端设备

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/424,976 Continuation US8588211B2 (en) 2007-05-31 2009-04-16 Method for changing session media, method for establishing a call, and equipment thereof

Publications (1)

Publication Number Publication Date
WO2008145051A1 true WO2008145051A1 (fr) 2008-12-04

Family

ID=40074578

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2008/071017 WO2008145051A1 (fr) 2007-05-31 2008-05-20 Procédé servant à convertir des supports de conversation, procédé et dispositif servant à mettre à jour l'établissement d'un appel

Country Status (5)

Country Link
US (2) US8588211B2 (zh)
EP (1) EP2056618B1 (zh)
CN (1) CN101316435B (zh)
AT (1) ATE516675T1 (zh)
WO (1) WO2008145051A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11290685B2 (en) * 2013-07-03 2022-03-29 Huawei Technolgoies Co., Ltd. Call processing method and gateway

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101527891B (zh) * 2008-04-30 2011-04-20 华为技术有限公司 一种跨网络呼叫保持方法和设备
CN102006269B (zh) * 2009-08-28 2013-10-16 中兴通讯股份有限公司 一种ip多媒体子系统多会话能力同步方法及系统
CN102026154B (zh) * 2009-09-23 2014-11-05 中兴通讯股份有限公司 一种媒体修改方法及系统
US9007415B2 (en) * 2010-12-16 2015-04-14 Mitel Networks Corporation Method and system for audio-video communications
US8254377B1 (en) 2011-09-06 2012-08-28 Metropcs Wireless, Inc. System and method for HLR support for IP-MSC feature activation
WO2014058135A1 (ko) * 2012-10-08 2014-04-17 엘지전자 주식회사 무선 통신 시스템에서 패킷데이터네트워크 게이트웨이 선택 방법 및 장치
CN109691150B (zh) * 2017-03-07 2021-09-14 华为技术有限公司 一种会话迁移方法及设备
CN109040984B (zh) * 2017-06-12 2021-05-18 中国移动通信集团浙江有限公司 一种弹屏消息发送方法及装置
US10524266B2 (en) 2017-10-20 2019-12-31 Google Llc Switching transmission technologies within a spectrum based on network load
US11006413B2 (en) 2017-12-06 2021-05-11 Google Llc Narrow-band communication
US10779303B2 (en) 2017-12-12 2020-09-15 Google Llc Inter-radio access technology carrier aggregation
US10608721B2 (en) 2017-12-14 2020-03-31 Google Llc Opportunistic beamforming
US10868654B2 (en) 2017-12-15 2020-12-15 Google Llc Customizing transmission of a system information message
WO2019118020A1 (en) 2017-12-15 2019-06-20 Google Llc Satellite-based narrow-band communication
US11246143B2 (en) 2017-12-15 2022-02-08 Google Llc Beamforming enhancement via strategic resource utilization
US10375671B2 (en) * 2017-12-22 2019-08-06 Google Llc Paging with enhanced beamforming
US11251847B2 (en) 2018-03-28 2022-02-15 Google Llc User device beamforming
US11233548B2 (en) 2018-09-10 2022-01-25 Google Llc Fast beam tracking

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030027595A1 (en) * 2001-07-31 2003-02-06 Ejzak Richard Paul Provision of services in a communication system including an interworking mobile switching center
WO2005027460A1 (en) * 2003-09-12 2005-03-24 Telefonaktiebolaget Lm Ericsson (Publ) Combinational multimedia services
CN1832471A (zh) * 2005-03-09 2006-09-13 华为技术有限公司 Ip多媒体子系统终端用户面的不同协议间互通的方法
CN1897578A (zh) * 2005-07-14 2007-01-17 华为技术有限公司 一种消息转换方法与系统

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5970134A (en) * 1997-02-26 1999-10-19 Mci Communications Corporation System and method for monitoring calls parked on an automatic call distributor
WO2002052811A1 (en) 2000-12-22 2002-07-04 Nokia Corporation Method and system for modifying a connection parameter
US7068646B2 (en) * 2001-04-03 2006-06-27 Voxpath Networks, Inc. System and method for performing IP telephony including internal and external call sessions
CN101015167B (zh) * 2004-09-08 2010-12-22 艾利森电话股份有限公司 用于共享正进行的数据会话的方法、网络综合节点和系统
CN1297124C (zh) * 2004-09-30 2007-01-24 华为技术有限公司 Ip多媒体子系统中利用电路交换承载业务的系统及方法
US7206582B2 (en) * 2004-12-27 2007-04-17 Newstep Networks Inc. Method, system and apparatus for call path reconfiguration
DE602005015764D1 (de) * 2005-01-31 2009-09-10 Ericsson Telefon Ab L M Technik zum umschalten zwischen sprach-/multimediamodus in einem drahtlosen kommunikationsnetz
DE102005006174A1 (de) * 2005-02-10 2006-08-17 Siemens Ag Signalisierung eines Wechsels von einem ersten Dienst zu einem zweiten Dienst während einer Gesprächsverbindung
US7953399B2 (en) * 2005-02-28 2011-05-31 Nokia Corporation Network-initiated service change from speech to multimedia
US7864936B2 (en) * 2005-06-24 2011-01-04 Aylus Networks, Inc. Method of avoiding or minimizing cost of stateful connections between application servers and S-CSCF nodes in an IMS network with multiple domains
US20070291776A1 (en) * 2005-07-28 2007-12-20 Dilithium Networks, Inc. Method and apparatus for billing for media during communications in channel-based media telecommunication protocols
KR100909542B1 (ko) * 2005-08-01 2009-07-27 삼성전자주식회사 Ｃｓｉ 단말과 ims 단말 사이의 음성 및 멀티미디어 서비스 연동을 위한 방법 및 장치
CN1750400B (zh) 2005-08-26 2010-04-14 东南大学 四通道并行时钟数据恢复电路
CA2623552A1 (en) * 2005-09-23 2007-04-05 Interdigital Technology Corporation Wireless communication method and system for supporting call continuity
CN100396074C (zh) * 2005-10-05 2008-06-18 华为技术有限公司 一种提供预付费业务的方法、装置及系统
CN100479440C (zh) 2005-10-13 2009-04-15 华为技术有限公司 一种电路交换网与ip多媒体子系统网络互通的系统和方法
DE102005050586B3 (de) * 2005-10-21 2006-11-02 Siemens Ag Verfahren zum Aufbau einer Videotelefonverbindung und/oder Multimediatelefonverbindung in einem Datennetz
US7860102B2 (en) * 2006-02-20 2010-12-28 Nokia Corporation Call establishment for multimedia call
CN101083541B (zh) * 2006-05-31 2013-05-01 朗迅科技公司 Ims网关系统和方法
CN101449523B (zh) * 2006-06-01 2013-05-08 艾利森电话股份有限公司 智能网中的服务改变和服务回退的方法及其网络节点
US7817648B2 (en) * 2006-08-04 2010-10-19 Nokia Corporation Interworking control between different communication parties
WO2008026094A1 (en) * 2006-08-28 2008-03-06 Nokia Corporation Method, system and terminal for multimedia session establishment
WO2008041111A2 (en) * 2006-10-04 2008-04-10 Nortel Networks Limited Circuit-switched and multimedia subsystem voice continuity
US8923852B2 (en) * 2006-11-01 2014-12-30 Seven Networks, Inc. System, method, and computer-readable medium for user equipment decision-making criteria for connectivity and handover
US8929360B2 (en) * 2006-12-07 2015-01-06 Cisco Technology, Inc. Systems, methods, media, and means for hiding network topology
US8340084B2 (en) 2007-03-30 2012-12-25 Telefonaktiebolaget Lm Ericsson (Publ) System and method for indicating circuit switched access at IMS registration
US8502855B2 (en) 2007-04-26 2013-08-06 Telefonaktiebolaget L M Ericsson (Publ) Codec negotiation
US20090313318A1 (en) * 2008-06-13 2009-12-17 Dye Thomas A System and method using interpretation filters for commercial data insertion into mobile computing devices

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030027595A1 (en) * 2001-07-31 2003-02-06 Ejzak Richard Paul Provision of services in a communication system including an interworking mobile switching center
WO2005027460A1 (en) * 2003-09-12 2005-03-24 Telefonaktiebolaget Lm Ericsson (Publ) Combinational multimedia services
CN1832471A (zh) * 2005-03-09 2006-09-13 华为技术有限公司 Ip多媒体子系统终端用户面的不同协议间互通的方法
CN1897578A (zh) * 2005-07-14 2007-01-17 华为技术有限公司 一种消息转换方法与系统

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11290685B2 (en) * 2013-07-03 2022-03-29 Huawei Technolgoies Co., Ltd. Call processing method and gateway

Also Published As

Publication number Publication date
EP2056618B1 (en) 2011-07-13
US20090201922A1 (en) 2009-08-13
US8588211B2 (en) 2013-11-19
ATE516675T1 (de) 2011-07-15
EP2056618A4 (en) 2010-01-20
CN101316435A (zh) 2008-12-03
US20120275384A1 (en) 2012-11-01
US8515053B2 (en) 2013-08-20
EP2056618A1 (en) 2009-05-06
CN101316435B (zh) 2012-08-08

Similar Documents

Publication Publication Date Title
WO2008145051A1 (fr) Procédé servant à convertir des supports de conversation, procédé et dispositif servant à mettre à jour l'établissement d'un appel
US10469545B2 (en) Multimedia session call control method and application server
US8213418B2 (en) Providing packet-based multimedia services via a circuit breaker
US20050025047A1 (en) Providing packet-based multimedia services via a circuit bearer
US20100195644A1 (en) Method for switching the session control path of ip multimedia core network subsystem centralized service
EP2232894A2 (en) Method and apparatus for an internet protocol multimedia subsystem-based three-way call
EP2182692A1 (en) A method, device and system for processing the continuity of the media stream in a session
WO2009012665A1 (fr) Procédé pour assurer une continuité d'appel multimédia, équipement et système associés
WO2011026438A1 (zh) 跨无线接入技术的语音切换方法、设备及网络系统
JP5095759B2 (ja) 呼制御方法
WO2007019777A1 (fr) Méthode d’établissement de session et nœud de contrôle de session
WO2009094940A1 (fr) Appareil et procédé de renégociation de capacités multimédias
WO2008116386A1 (fr) Procédé, système et dispositif pour fournir un service multi-session à des abonnés
WO2009074104A1 (fr) Procédé, système et appareil d'établissement d'appel multimédia
WO2009089711A1 (fr) Procédé, système et dispositif pour faire alterner un type de média
WO2009046653A1 (fr) Procédé, dispositif et système d'application de lignes directrices
CN101014153A (zh) 一种ims网络sip终端互通系统及其方法
WO2010127620A1 (zh) 会话转移方法和用户设备
WO2008110110A1 (fr) Procédé et système de fourniture de service de sous-système multimédia ip
WO2009121310A1 (zh) 一种网关选择的方法、系统及设备
WO2009074103A1 (fr) Procédé et dispositif pour réaliser la mise en attente
US8369314B2 (en) Call control method and IMS CS control apparatus
WO2009026757A1 (fr) Système de gestion d'appels, procédé appliqué à des terminaux ims et terminal ims
WO2008049371A1 (fr) Procédé et système pour transférer un événement de service
JP6348875B2 (ja) 中継装置、呼制御システム、呼制御方法、および、呼制御プログラム

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08748623

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2008748623

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE