WO2009015576A1

WO2009015576A1 - Method, system and device for changing voice service to fax service

Info

Publication number: WO2009015576A1
Application number: PCT/CN2008/071648
Authority: WO
Inventors: Yunfei Li; Yigang Jia; Guojun Zhu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-08-01
Filing date: 2008-07-15
Publication date: 2009-02-05
Also published as: CN101132461B; CN101132461A

Abstract

A method for changing voice service to fax service, the method includes following steps of that while a mobile switch center of a fax transmitter acquires that it needs to perform the service change from voice to fax, it sends a service change notice about performing the service change from voice to fax to a base station controller of the fax transmitter, wherein the notice carries the fax service IWF direction of the fax transmitter; the base station controller of the fax transmitter performs the service change from voice to fax according to the service change notice. A system, device, program product and computer-readable medium corresponding to implementing the service change from voice to fax are also provided. It makes the operation of changing voice service to fax service easy by adopting the scheme of the example of the present invention.

Description

Method, system and device for changing voice service to fax service

The present invention relates to the field of communications, and more particularly to a method, system, device, computer program product, and computer readable medium for voice service to fax service change. Background of the invention

The Interworking Function (IFF) is a device in the communication network. It supports the interworking function of the circuit domain data service between the wireless network and other networks. It uses the synchronous/asynchronous data for remote access, email access, and intranet connection. Incoming, Interactive Session Protocol (ISP) access, public database retrieval, and interconnection of two data terminals. The foregoing other networks include: Public Switched Telephone Network (PSTN), Integrated Services Digital Network (ISDN), Internet, and other Public Land Mobile Network (PLMN). .

As shown in Figure 1, the IWF networking is based on the Time Division Multiplexing (TDM) Base Station Controller (BSC). The two ends are TDM BSCs and the inter-office bearers are IP. At present, users widely use the voice-re-fax service first, that is, the two parties first conduct voice calls, and then perform fax services through service changes.

When both parties of the voice call need to change the voice service to the fax service, the two parties respectively press the fax start button, and the fax sender sends the fax machine call signal (Calling Tone, CNG) signal to the fax receiver, and the fax receiver gives The fax sender sends the Called Station Identification (CED) tone. After the fax sender BSC detects the CED signal, it initiates a service change, and the fax receiver's terminal detects the CED signal sent by the fax machine connected thereto and initiates a service change. As shown in Figure 2, the IWF networking mode is based on the IP BSC. The two ends are IP BSCs and the inter-office bearers are IP. In the case of voice-to-fax service change, the fax receiver still initiates a service change by detecting the CED signal from the terminal connected to the receiving fax machine; but for the fax sender, there is no transcoder (TC) resource due to the IP BSC. The CED tone cannot be detected. Therefore, the process of initiating a service change by the sender BSC to detect the CED signal cannot be performed in the IWF networking mode of the TDM BSC.

The mobile switching center (MSCe) shown in Figure 2 is configured to indicate that the user changes from a voice call to a fax sender with a specific number; when the user needs to change to a fax sender during the call, the user needs to send according to the agreement. The FLASH message with the specific number is sent to the MSCe, and the MSCe checks the number dialed by the user. If the MSCe analysis number is changed to the fax sender, the BSC is notified to perform the service change, and the fax sender service change procedure is triggered. Summary of the invention

Embodiments of the present invention provide a method, system, device, computer program product, and computer readable medium for changing a voice service to a fax service.

A method for changing a voice service to a fax service, the method comprising the following steps: When a fax sender mobile switching center learns that a voice to fax service change is required, sending a voice to fax service change to a fax sender base station controller a notification, wherein the notification carries the fax service IWF direction of the fax sender;

The fax sender base station controller performs a change of the voice service to the fax service according to the service change notification.

A system for changing a voice service to a fax service, the system comprising:

a fax sender mobile switching center, configured to send a voice to fax service change notification when the service change requiring voice to fax is known, wherein the notification carries the fax service IWF direction of the fax sender;

a fax sender base station controller, configured to receive the fax sender mobile switching center to send The business change notification changes the voice to fax service based on the received service change notification. A device for changing a voice service to a fax service, where the device includes:

a learning module, configured to learn that a fax sender needs to perform voice to fax service change; and a notification module, configured to send a voice to fax when the learning module learns that the fax sender needs to perform voice to fax service change A service change notification, wherein the notification carries the fax service IWF direction of the fax sender.

A voice to fax service change notification device, where the device includes:

The voice-to-fax service change notification module is configured to send an inter-office negotiation message to notify the fax sender that the network side needs to perform voice-to-fax service change, and the inter-office negotiation message carries the fax service I WF direction of the fax receiver.

A computer program product for voice service to fax service change, comprising: a computer program code for performing the steps in the above method, or implementing one or more of the above systems when it is running on a computer device Modules or units, or one or more modules or units in the above described devices.

A computer readable medium storing the above computer program product.

In the above embodiment of the present invention, the fax sender sends a service change notification carrying the direction of the local IWF when the service change of the voice to fax is required, thereby triggering the fax sender to perform the change of the voice to fax service. According to the foregoing solution of the embodiment of the present invention, the voice to fax service in the IP BSC-based networking mode can be changed. The user does not need to distinguish between different networking modes, and the fax sender and the fax receiver need not be distinguished. Different treatments make it easy to use. In addition, since the service change notification carries the IWF direction of the sender's local end, the user can also avoid the process of sending a specific number to trigger the service change, thereby making the voice-to-fax service change more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an IWF networking in which IP is inter-office in a networking mode based on TDM BSC in the prior art. Schematic diagram

2 is a schematic diagram of an IWF networking mode in which an inter-office IP is set in an IP BSC-based networking manner in the prior art;

3 is a flow chart of a change of a voice service to a fax service in a networking mode of a TDM BSC in the prior art;

FIG. 5 is a schematic diagram of a method for networking an IWF that is connected to a PSTN in the prior art;

6 is a flowchart of a voice service to fax service change in an IWF network based on an IP bearer in an IP BSC according to the first embodiment of the present invention;

7 is a flowchart of a voice service to fax service change in an IWF network that is carried by a TDM under the IP BSC according to the second embodiment of the present invention;

8 is a flowchart of a voice service to fax service change in an IWF network that is connected to an IP BSC and a PSTN according to Embodiment 3 of the present invention;

9 is a schematic diagram showing the composition of a fax sender and a fax receiver MSCe in Embodiment 4 of the network mode of FIG. 3;

Figure 11 is a schematic diagram showing the composition of the fax sender and the fax receiver MSCe in the sixth embodiment of the invention in the networking mode of Figure 5. Mode for carrying out the invention

Figure 3 is a flow chart showing the change of voice service to fax service in the networking mode of the TDM BSC in the prior art. Referring to Figure 3, the mobile terminal 1 (Mobile Station 1 , MS 1 ) and the mobile terminal 2 (Mobile Station 2, MS2) are respectively connected to their local fax machines. The specific changes are as follows:

Step 301: Two users are making a voice call through MS1 and MS2, when needed to change to When faxing, both parties press the fax start button.

Step 302: The fax sender's fax machine sends a CNG tone to the fax receiver via MS1.

Step 303: The fax receiver's fax machine sends a CED tone to the fax sender via MS2.

Step 304: The fax sender of the fax sender and the fax machine of the fax receiver respectively establish an IWF connection.

In step 304, the specific steps of the fax machine of the fax receiving party to establish an IWF connection are as follows: Step 304a: After the MS2 of the fax receiving party detects the CED signal sent by the fax machine connected thereto, the MS2 initiates and the BSC2 of the fax receiving party Business negotiation.

Step 304b: The BSC2 of the fax receiver notifies the fax receiver of the CDMA mobile switching center 2 (MSCe2) that the service is changed, and the notification carries the local IWF direction as the fax receiver.

Step 304c: The MSCe2 of the fax receiver and the media gateway 2 (Media GateWay 2, MGW2) of the fax receiver perform signaling interaction, and the MSCe2 notifies the MGW2 of the fax receiver to modify the bearer, and the MGW2 accesses the IWF device, and the notification carries IWF direction information is provided for subsequent IWF device and fax party to perform signaling interaction.

Step 304d: At the same time as step 304c, the MSCe2 of the fax receiver and the BSC2 of the fax receiver perform signaling interaction, and the MSCe2 notifies the BSC2 of the fax receiver to modify the bearer.

Step 304e: After the bearer modification is completed, the IWF device of the fax receiver and the fax receiver perform signaling interaction to establish an IWF connection.

In the above step 304, the specific steps of the fax sender's fax machine establishing the IWF connection are as follows: Step 304a,: The fax sender's service change is similar to the receiver, and the difference is that the trigger is different, and the fax sender's BSC1 detects the fax receiver sending. After the CED signal, initiate and fax the sender's MS1 service negotiation.

Step 304b,: After the negotiation, the BSC1 of the fax sender notifies the fax sender of the MSCel to send The service is changed. The notification carries the local IWF direction as the fax sender.

Step 304c: The MSCel of the fax sender and the MGW1 of the fax sender perform signaling modification, and the MSCel notifies the MGW1 of the fax sender to modify the bearer, and the MGW1 accesses the IWF device, and the notification carries the IWF direction information, so as to follow the IWF. The device and the fax side perform signaling interaction.

Step 304d,: At the same time as step 104c, the MSCel of the fax sender and the BSC1 of the fax sender perform signaling interaction, and the MSCel notifies the BSC1 of the fax sender to modify the bearer.

Step 304e,: After the bearer modification is completed, the IWF device of the fax sender and the fax sender perform signaling interaction to establish an IWF connection.

Step 305: The fax sender or the fax sender starts the inter-office negotiation after the MGW bearer modification is completed, and the fax sender and the fax receiver's MGW respectively modify the inter-office bearer.

The specific steps of step 305 are as follows:

Step 305a: After the MSCe receives the modified bearer completion response message of the MGW of the respective office, if the interoffice is an IP bearer, the INVITE message of the Session Initiation Protocol (SIP) signaling is notified to the peer to notify the MGW. Change the interoffice bearer from the voice bearer endpoint to the data bearer endpoint.

Step 305b: After the inter-office SIP signaling negotiation is completed, the two stations MSCe respectively notify the respective office MGW to modify the bearer.

Step 306: After the inter-office bearer modification is completed, the fax sender and the fax receiver perform signaling interaction through the IWF device. After the negotiation is completed, the sending and receiving parties start the fax process.

After the IP BSC is adopted, the fax receiving side can complete the service change according to the above processing steps. The inter-office IP bearer may be modified by the receiving side to initiate the service change. However, for the service change on the fax transmitting side, the fax sender user needs to send the FLASH of the specific number to trigger the service change of the fax sender, but this may result in a service change. The operation is complicated.

Therefore, the embodiment of the present invention provides a method, system, and method for changing a voice service to a fax service. The device sends a service change notification carrying the local IWF direction to the fax sender, so as to trigger the fax sender to perform the voice-to-fax service change, so that the operation is performed, and the user is prompted to perform the voice-to-fax service change. There is also no need to send a specific number, making it easier to make changes to the voice-to-fax service.

The specific embodiments of the present invention are further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments. In the embodiments of the present invention, the same reference numerals denote the same or similar steps, modules or units.

In an embodiment of the invention, inter-office SIP signaling is extended to carry the IWF direction. After the service is changed on the access side, the service change information is sent through the INVITE message of the extended SIP signaling, and the MSCe of the other side is notified. The INVITE message carries the IWF direction of the local end. After receiving the MSCe on the other side, the MSCe initiates the local service change according to the IWF direction of the peer.

Referring to FIG. 6, which is a flowchart of a voice service to fax service change in an IWF network based on an IP bearer in an IP BSC according to the first embodiment of the present invention. In the first embodiment of the present invention, the mobile terminals MS1 and MS2 are respectively connected to their local facsimile machines. In the IP BSC networking, the process of voice service to fax service change is as follows.

Step 601: Two users are making a voice call. When it is necessary to change to a fax, both parties press the fax start button.

Step 602: The fax sender's fax machine sends a CNG tone to the fax receiver through MS1.

Step 603: The fax receiving fax machine sends a CED signal to the fax sender through MS2.

Step 604: After the MS2 of the fax receiver detects the CED signal sent by the fax machine connected thereto, the bearer is modified, and the IWF device and the fax receiver perform signaling interaction to establish an IWF connection. The specific steps and steps 304a-304e are the same, and are not described here.

Step 605: The MSCe2 of the fax receiver receives the modification of the MGW2 received by the fax receiver. As a message, the originating and fax senders perform inter-office negotiation through SIP signaling, and send the service change information to the fax sender's MSCel through the inter-office negotiation INVTIE message. The SIP protocol is extended in the above INVTIE message, and the message carries the IWF direction of the fax receiver. In this way, the sender of the IWF service change has been notified to the sender through the INVTIE message.

Step 606: After receiving the INVITE message, the fax sender MSCel obtains the IWF direction of the local end as the fax sender according to the IWF direction of the receiver in the INVITE message (in the opposite direction to the receiver IWF in the INVITE message), and then notifies the present The BSC1 performs a service change, and the notification carries the IWF direction of the sender's local end, and the IWF direction is the fax sender.

Preferably, in the first embodiment of the present invention, after the fax sender MSCel receives the INVITE message, it may first determine whether the sender has changed the service. If the sender does not have a service change on the local access side, the INVITE message may be used according to the INVITE message. The IWF direction is obtained by the local IWF direction as the fax sender (in the opposite direction to the receiver IWF in the INVITE message), and then the fax sender BSC1 is notified to perform the service change, and the notification carries the IWF direction of the sender, and the IWF direction is Fax sender.

Step 607: After receiving the notification of the service change, the fax sender BSC1 initiates service negotiation with the terminal of the fax sender, and then performs the same process as step 304b, ~304e, to complete the local voice-to-fax service change. , I won't go into details here.

Step 608: The original inter-office negotiation is performed as usual. After the inter-office SIP signaling negotiation is completed, the two stations MSCe respectively notify the MGW to modify the bearer. This step is the same as the previous step 305 and will not be described again.

Step 609: After the bearer modification is completed, the fax sender and the fax receiver perform signaling interaction through the IWF device. After the negotiation is completed, the sending and receiving parties start the fax process.

In the first embodiment of the present invention, SIP signaling is extended. The IWF direction of the fax receiver is sent to the fax sender as the service change information in the INVITE message of the SIP signaling, and the fax sender is triggered to perform the voice to fax service change, so that the voice to fax is performed in the IP BSC networking mode. The business operation change order is simple, and the user does not need to distinguish between different networking modes, and it is not necessary to distinguish between the fax sender and the fax receiver to perform different processing, and the use is convenient. Referring to FIG. 4, it is a schematic diagram of an IWF networking mode in which the inter-office is TDM in the networking mode based on the IP BSC in the prior art. The mobile terminals MS1 and MS2 are respectively connected to their local fax machines, and the two ends are IP BSC. If the interoffice 7| is TDM, the traditional TDM relay cannot transmit service change information through SIP signaling.

In order to solve the above problem, in the process of establishing a voice call, the MGW of the calling party and the called party may be separately notified to perform the fax tone detection on the TDM side. The fax signal tone detection function is provided by the MGW. After the fax receiver receives the voice-to-fax service change, the fax signal CED signal is sent as the service change information, and the MGW detects the fax signal tone sent by the TDM side, and notifies the MSCe to the IP side. Initiate a business change.

Referring to FIG. 7, which is a flowchart of a voice service to fax service change in an IWF network that is carried by an TDM under the IP BSC according to the second embodiment of the present invention. The flow of the voice service to fax service change shown in Figure 7 is as follows.

Step 701: Send a fax detection request during the process of establishing a voice call.

During the establishment of the voice call, the MSCe of the call sender and the call receiver respectively judge that both sides are based on IP7|, and then do not notify the MGW to perform fax detection; if the MSCe determines that one side is based on the IP bearer And the other side is based on the TDM bearer, and the user subscribes to the IWF service, and the MSCe sends a fax tone detection request in the setup bearer message when requesting the MGW to establish the bearer, the request indicating that the MGW performs the fax signal tone on the TDM side. Detection. In this embodiment, since the MSCel determines that one side is based on the IP bearer and the other side is based on the TDM bearer, the MSCel requests the MGW1 to establish a bearer, and carries the fax signal tone detection request in the setup bearer message, so that the MGW1 pair is based on One side of the TDM bearer performs fax signal tone detection; since MSCe2 judges that one side is based on the IP bearer and the other side is based on the TDM bearer, when MSCe2 requests the MGW2 to establish a bearer, it carries the fax signal tone detection request in the setup bearer message. , Let MGW2 perform fax tone detection on the side based on TDM bearer.

Step 702: The two parties make a voice call. When it is necessary to change to a fax, both parties press the fax start button. Step 703: The fax machine of the fax sender sends a CNG tone to the fax receiver through the terminal MS1.

Step 704: The fax receiver of the fax receiving party sends a CED tone to the fax sender through the terminal MS2.

Step 705: After the terminal of the fax receiver detects the CED signal sent by the fax machine connected thereto, the bearer is modified, and the IWF device and the fax receiver perform signaling interaction to establish an IWF connection. The specific steps are the same as the aforementioned steps 304a to 304e, and are not described herein again.

Step 706: After the call is established, the MGW1 and the MGW2 respectively perform the fax tone detection. When the fax receiver changes the voice to fax service and sends the CED signal, the CED signal is sent from the IP bearer side of the MGW2, so the MGW2 is not detected, and the MGW1 detects the CED at the TDM relay endpoint. Signal, MGW1 sends an event notification that detects the CED signal to MSCel.

Step 707: After receiving the MGW1 event notification, the MSCel determines that the service is changed by the peer office corresponding to the TDM trunk, and the TDM relays the opposite party to the fax receiver, and the MSCel notifies the BSC1 of the service change, where the notification carries the MSCel end. In the IWF direction, the direction is the fax sender (the reverse direction of the IWF direction corresponding to the TDM trunk peer office).

Step 708: After receiving the notification of the service change, the fax sender BSC1 initiates service negotiation with the terminal of the fax sender, and then performs the same process as step 304b, ~304e, to complete the local voice-to-fax service change. I won't go into details here.

Step 709: After the bearer modification is completed, the fax sender and the fax receiver perform signaling interaction through the IWF device. After the negotiation is completed, the sending and receiving parties start the fax process.

In the second embodiment of the present invention, by adding the fax signal tone detection, the fax signal tone sent by the fax receiver is sent to the fax sender as the service change information, and the fax sender is triggered to perform the voice-to-fax service change, so that the inter-office is changed. For the change operation of the voice-to-fax service in the IP BSC networking mode of the TDM, the user does not need to distinguish between different networking modes, and there is no need to distinguish between the fax sender and the fax receiver for different processing and convenient use. In the above embodiment, only when the user subscribes to the fax service, the media gateway performs the detection of the fax tone, instead of requiring the media gateway to detect the fax tone of all the calls, thereby saving network resources.

Referring to FIG. 5, it is a schematic diagram of an IWF networking mode that interfaces with the PSTN in the prior art. As shown in Figure 5, in the networking mode where IP BSC and PSTN are connected, when the IP BSC side is the fax sender and the PSTN is the fax receiver, the fax receiver will send a fax to the fax to the fax. The sender sends the CED signal, because the BSC of the fax sender cannot detect the CED signal, and the MSCe of the gateway cannot learn the service change information from the PSTN side.

In order to solve the above problem, the method for detecting a fax signal in the second embodiment of the present invention may be adopted. The difference is that the end office MSCe has the user's fax service subscription information, and the gateway MSCe does not have the user's fax. Business contract information. In order to avoid detecting all calls, the fax signal detection can be performed only by the user who subscribes to the fax service, and the fax detection request can be added to the interoffice call message. In order to transmit the fax detection request, SIP signaling is required to be extended. After the MGW detects the fax signal and notifies the MSCe, the MSCe needs to send the information of the service change to the MSCe of the fax sender in the INVITE message, and the MSCe of the fax sender notifies the present. The BSC at the end performs the change of the voice to fax service.

FIG. 8 is a flowchart of a voice service to fax service change in an IWF network that is connected to an IP BSC and a PSTN according to Embodiment 3 of the present invention. In Figure 8, the process of voice-to-fax service change in the networking mode in which IP BSC and PSTN are connected is as follows.

Step 801: During the establishment of the voice call, the INVITE message is extended, and the fax detection request is carried in the INVITE message.

The specific process of the above step 801 is as follows:

1) The user initiates a call under the IP BSC, and the BSC1 sends a call request to the MSCel;

2) The MSCel requests the MGW1 to establish a bearer: establish a bearer connected to the access side of the MGW1 and the BSC1, and establish an inter-office bearer;

3) MGW1 establishes a bearer completion, and sends a bearer completion response to the MSCel; 4) MSCel requests BSC1 to establish an air interface channel and a bearer between MGW1 and BSC1;

5) BSC1 establishes an air interface channel and completes the notification MSCel.

In the third embodiment of the present invention, when the IP BSC side terminal initiates a call, when the MSCe of the call originator sends an INVITE message to the opposite end office to request to establish a call, the MSCe determines that the access side of the local office is an IP BSC, and the user subscribes to the IWF service. , the fax detection request is carried in the INVITE message. Optionally, if the user B is called in the IP BSC, when the MSCe on the IP BSC side sends a response to the INVITE message to the opposite office 200 OK, the MSCe determines that the access side of the local office is the IP BSC, and the user signs the contract. The IWF service carries a fax detection request in the response message of the INVITE message.

In the third embodiment of the present invention, the description is made on the case that the IP BSC side terminal initiates a call. If the MSCe determines that both sides are based on the IP bearer, the MGW is not notified of the facsimile detection. If the MSCe determines that one side is based on the IP bearer and the side is based on the TDM bearer, when the MGW is requested to establish the bearer, Carrying a fax tone detection request in the setup bearer message, and letting the MGW perform the fax tone detection on the TDM side. In this embodiment, since the MSCel determines that both sides are based on the IP bearer, when the MSCel requests the MGW1 to establish a bearer, the MGW1 is not allowed to perform the fax tone detection.

After receiving the INVITE message carrying the fax detection request, the gateway MSCe judges that both sides are based on the IP bearer, and does not notify the MGW to perform the fax detection, and transmits the fax detection request when sending the INVITE call request to the office. . If the MSCe determines that one side is based on the IP bearer and the other side is based on the TDM bearer, when the bearer is established with the fax receiver MGW, the fax signal tone detection request is carried in the setup bearer message, and the MGW is placed on the TDM side. Perform fax tone detection. In this embodiment, since the MSCe2 determines that one side is based on the IP bearer and the other side is based on the TDM bearer, the MSCe2 requests the MGW2 to establish a bearer, and carries the fax signal tone detection request in the setup bearer message, so that the MGW2 performs Fax tone detection.

Step 802: The two parties make a voice call. When it is necessary to change to a fax, both parties press the fax start button.

Step 803: The fax machine of the fax sender sends the CNG to the fax receiver through the terminal MS1. Signal tone.

Step 804: The fax receiver of the fax receiving party sends a CED tone to the fax sender through the terminal MS2.

Step 805: After the call is established, the MGW 2 detects whether the fax detection tone is sent by the side based on the TDM bearer. When the fax receiver performs the change of the voice-to-fax service and sends the CED signal, the MGW2 detects the CED tone sent by the opposite office at the TDM relay endpoint, and determines that the service change occurs at the opposite end, and the opposite end is the fax receiver. The MGW2 sends an event notification that the CED signal is detected to the MSCe2.

Step 806: After receiving the notification of the MGW2 event, the MSCe2 determines that the service of the opposite end office corresponding to the TDM relay changes, and the TDM relays the corresponding fax receiver to the opposite end office, and the MSCe2 sends an INVITE message to the MSCel on the IP relay side to request the MSC. The service change, where the INVITE message carries the IWF direction of the peer end, and the direction is the fax receiver (the IWF direction corresponding to the TDM trunk peer office).

Steps 807-810: The other side MSCel receives the INVITE message requesting the service change, and the subsequent processing is the same as steps 606-609 in Embodiment 1, and is not mentioned.

In the third embodiment of the present invention, the fax sender MSCa may also first determine whether the sender has changed the service. If the sender does not have a service change on the local access side, the fax sender BSC is notified to perform the service change, and the notification is The IWF direction of the sender is carried. If the service change has occurred on the access side of the sender, the fax sender BSC1 is not notified to perform the service change.

In the third embodiment of the present invention, by adding the fax signal tone detection, the fax receiver sends the fax signal tone as the service change information, and the gateway receives the fax signal tone, and then sends the INVITE message with the fax receiver's IWF direction through the SIP signaling. The fax sender MSCe is triggered to trigger the change of the voice-to-fax service of the fax sender, so that the voice-to-fax service can be changed in the IP BSC network connected to the PSTN, and the user does not need to distinguish between different networking modes. It is not necessary to distinguish between the fax sender and the fax receiver for different processing and is convenient to use. The embodiment of the present invention is only The user who has signed the fax service is tested to reduce the occupation of network resources. In order to implement the above embodiments of the present invention, the following extensions are required for SIP:

(1) Extend the SIP signaling to carry the IWF direction.

(2) Extend the SIP signaling to carry the fax detection request.

You can carry the IWF direction by adding attributes, such as:

Use the following attributes to indicate the fax sender:

a = IwfCaller

Use the following attributes to indicate the fax recipient:

a = IwfCalled

E.g:

INVITE sip: 8712345® 127.0.0.1 : 5061 ;User=phone SIP/2.0 Allow: INVITE, ACK, BYE, CANCEL, COMET, PRACK, UPDATE Supported: update, 1 OOrel

Call-ID: 01EF351FF881400000000000@ 127.0.0.1

From : <sip : 010203 @ 127.0.0.1

5056; User=phone>;tag=29005358336B534F610A0000

To: <sip: 8712345® 127.0.0.1 : 5061; User=phone〉

Contact: sip: 010203 @ 10.70.0.135: 5056

CSeq: 1 INVITE

Via: SIP/2.0/UDP 127.0.0.1: 5056

Max-Forwards: 70

Content- Type: multipart/mixed;boundary=unique-boundary- 1 Content- Length: 324

Content- Type: application/SDP

V=0

o=HuaweiSoftX3000 1073741824 1073741824 IN IP4 127.0.0.1 s=Sip Call

c=IN IP4 192.0.0.1

t=0 0

m=audio 49178 RTP/AVP 0

a=fax

a=IwfCalled

You can carry a fax detection request by extending a new header field, such as: Request, whose specific structure is defined as follows:

Request = " Request " HCOLON request-tag * (COMMA request-tag) and newly define a tag value IwfDetect, which indicates that fax signal detection is required. Such as:

Request=IwfDetect

For establishing a voice call, fax detection is required. The INVITE message is as follows:

INVITE sip: 0109@ 127.0.0.1: 5061 ;User=phone SIP/2.0

Allow: INVITE, ACK, BYE, CANCEL, COMET, PRACK, UPDATE

Supported: update, lOOrel

Request=IwfDetect

Call-ID: 01EF351FF881400000000000@ 127.0.0.1

From : <sip : 010203 @ 127.0.0.1 :

5056; User=phone>;tag=29005358336B534F610A0000

To: <sip: 0109 @ 127.0.0.1 : 5061; User=phone〉

Contact: sip: 010203@ 10.70.0.135: 5056

CSeq: 1 INVITE

Via: SIP/2.0/UDP 127.0.0.1 : 5056

Max-Forwards: 70

Content- Type: multipart/mixed;boundary=unique-boundary-l

Content- Length: 324

Content- Type: application/SDP V=0

o=HuaweiSoftX3000 1073741824 1073741824 IN IP4 127.0.0.1

s=Sip Call

c=IN IP4 192.0.0.1

t=0 0

m=audio 49178 RTP/AVP 8 0

a=rtpmap: 8 PCMA/8000

a=rtpmap: 0 PCMU/8000.

A system for changing a voice service to a fax service is also provided in the embodiment of the present invention. The system of the present invention will be described in detail below through Embodiment 4, Embodiment 5 and Embodiment 6 of the present invention.

The fourth embodiment of the present invention performs networking according to the networking mode shown in FIG. 3. The system for changing the voice service to the fax service provided by the fourth embodiment of the present invention includes: a fax sender mobile switching center MSCel, a fax sender media gateway MGW1, a fax receiver mobile switching center MSCe2, and a fax receiver media gateway MGW2. The connection relationship of the above entities is the same as the connection relationship shown in Figure 3, and will not be described here. When the two parties make a voice call, if they need to change to the fax service, the user presses the fax start button respectively, and the fax sender's fax machine sends a CNG tone to the fax receiver through the terminal MS1, and the fax receiver's fax machine passes the terminal MS2. The fax sender sends a CED tone.

After the MS2 of the fax receiver detects the CED signal sent by the fax machine connected thereto, the bearer is modified, and the IWF device and the fax receiver perform signaling interaction to establish an IWF connection, and send the change to the MSCe2 of the fax receiver. After receiving the completion message, the MSCe2 determines that the peer needs to notify the peer to perform the voice-to-fax change, and the fax sender performs the inter-office negotiation through the SIP signaling, and sends the fax to the fax through the inter-office negotiation INVTIE message. The sender's MSCel sends a service change notification, and the SIP protocol is extended in the above INVTIE message, and carries the IWF direction of the fax receiver, so that the sender is notified by the INVTIE message that the receiver has changed the IWF service. After receiving the INVITE message, the fax sender MSCel obtains the IWF direction of the local end as the fax sender according to the IWF direction of the receiver in the INVITE message, and then notifies the local BSC1 to perform the service change. The notification carries the sender's local IWF direction, BSC1. After receiving the voice-to-fax service change notification, the corresponding business change is made. Schematic diagram of the composition of the change center MSCel and the fax receiver mobile switching center MSCe2. In the fourth embodiment of the present invention, the fax sender mobile switching center MSCel specifically includes a learning module 901 and a notification module 902, wherein the learning module 901 is configured to receive the inter-office negotiation of the fax service IWF direction of the fax receiving party sent by the fax receiving party MSCe2. The notification module 902 is configured to perform a voice-to-fax service change by sending an inter-office negotiation message carrying the fax service IWF direction of the fax sender, according to the message that the inter-office negotiation message is required to perform the voice-to-fax service change. Notice. The learning module 901 specifically includes a first receiving unit 901-1 and a first determining unit 901-2. The first receiving unit 901-1 is configured to receive an inter-office negotiation message sent by the fax receiving party MSCe to carry the fax service IWF direction of the fax receiving party, where the first determining unit 901-2 is configured to receive the first receiving After receiving the inter-office negotiation message sent by the fax receiver MSCe, the unit learns that the voice-to-fax service needs to be changed according to the fax service IWF direction of the fax receiver in the inter-office negotiation message, and determines the local fax service IWF. The direction is the fax sender.

The fax receiving mobile switching center MSCe2 includes a first determining module 904 and a voice to fax service change notification module 903, and the first determining module 904 is configured to determine, after receiving the fax receiver access side bearer change completion message, The fax sender network side notifies the voice to fax service change information. The voice-to-fax service change notification module 903, when the first determining module 904 determines that it is necessary to notify the fax sender network side of the voice-to-fax service change information, transmits an inter-office negotiation message carrying the fax service IWF direction of the fax receiver.

The fifth embodiment of the present invention performs networking according to the networking mode shown in FIG. The system for changing the voice service to the fax service provided by the fifth embodiment of the present invention includes: a fax sender mobile switching center MSCel, a fax sender media gateway MGW1, and a fax receiver mobile switching center MSCe2. And the fax receiver media gateway MGW2.

During the establishment of the voice call, the MSCe of the call sender and the call receiver respectively judges that both sides of the call are based on the IP bearer and the other side is based on the TDM bearer, and the MSCe requests the MGW to establish. At the time of bearer, a fax tone detection request is sent in the setup bearer message, and the request indicates that the MGW performs the fax tone detection on the TDM side. Preferably, to avoid detection of all calls, MSCe may initiate fax detection only for users who subscribe to the fax service.

When the two parties make a voice call, when they need to change to a fax, the two parties press the fax start button respectively, and the fax machine of the fax sender sends a CNG tone to the fax receiver through the terminal MS1, and the fax receiver receives the fax.

The CED signal is sent from the IP bearer-based side of the MGW2. The MGW1 detects the CED signal at the TDM relay endpoint, and the MGW1 sends an event notification that the CED signal is detected to the MSCel.

After receiving the event notification sent by the MGW1, the MSCel determines that the service is changed by the opposite end office corresponding to the TDM relay, and the TDM relays the corresponding fax receiver to the opposite end office, and learns that the voice to fax change is required, the MSCel notifies the BSC1. A service change occurs. The notification carries the IWF direction of the MSCel end. After receiving the voice-to-fax service change notification, the BSC1 performs the corresponding service change.

Referring to FIG. 10, FIG. 10 is a schematic diagram showing the composition of a fax sender mobile switching center MSCel according to Embodiment 5 of the present invention in the networking mode of FIG. In the fifth embodiment of the present invention, the fax sender mobile switching center MSCel specifically includes: a learning module 1001 and a notification module 1002. The obtaining module 1001 is configured to receive an event notification that the CED signal is sent by the fax sender MGW1, and according to the event notification, it is required to perform a voice-to-fax service change, and the notification module 1002 is configured to send the fax sender by sending The inter-office negotiation message in the IWF direction of the fax service performs a voice-to-fax service change notification. The learning module 1001 specifically includes: a fax signal detection request unit 1001-1, a second receiving unit 1001-2, and a second determining unit 1001-3. The facsimile signal detection request unit 1001-1 is configured to transmit a facsimile tone sound detection request during the establishment of a voice call. Said The second receiving unit 1001-2 is configured to receive an event notification that the fax sender signal is detected by the fax sender media gateway MGW. The second determining unit 1001-3 is configured to, after the second receiving unit 1001-2 receives the event notification that the fax signal sound is detected, according to the event notification that the fax signal sound is detected, it is required to perform voice Change the service to the fax, and determine the IWF direction of the fax service at the local end as the fax sender.

The sixth embodiment of the present invention performs networking according to the networking mode shown in FIG. 5. The system for changing the voice service to the fax service provided by the sixth embodiment of the present invention comprises: a fax sender mobile switching center MSCel, a fax sender media gateway MGW1, a fax receiver mobile switching center MSCe2, and a fax receiver media gateway MGW2.

The fifth embodiment of the present invention is the same as the TDM bearer. Then, when the MSC is requested to establish a bearer, the MSCe sends a fax tone detection request in the setup bearer message, where the request indicates that the MGW performs the fax tone detection on the TDM side.

The CED signal is sent from the IP bearer-based side of the MGW2. The MGW2 detects the CED tone sent by the opposite office at the TDM relay endpoint, and the MGW2 sends an event notification that the CED signal is detected to the MSCe2.

After receiving the notification of the MGW2 event, the MSCe2 determines that the service is changed by the peer office corresponding to the TDM trunk, and the TDM relays the opposite party to the fax receiver, and the MSCe2 sends an INVITE message to the MSCel on the IP relay side to request a service change. The INVITE message carries the IWF direction of the peer end.

When the MSCel receives the INVITE message requesting the service change and learns that the voice-to-fax change is required, the MSCel notifies the BSC1 of the service change, and the notification carries the IWF of the MSCel end. In the direction, after receiving the voice-to-fax service change notification, the BSC1 performs the corresponding service change. Referring to FIG. 11, FIG. 11 is a schematic diagram showing the composition of a fax sender mobile switching center MSCel and a fax receiver mobile switching center MSCe2 according to Embodiment 6 of the present invention in the networking mode of FIG. In the sixth embodiment of the present invention, the fax sender mobile switching center MSCel specifically includes: a learning module 1101 and a notification module 1102. The obtaining module 1101 is configured to receive an inter-office negotiation message of the fax service IWF direction that is sent by the fax receiver MSCe2, and obtain a voice-to-fax service change according to the inter-office negotiation message, where the notification module 1102 It is used to perform a voice-to-fax service change notification by transmitting an inter-office negotiation message carrying the fax service IWF direction of the fax sender. The learning module 1101 specifically includes: a first receiving unit 1101-1 and a first determining unit 1101-2, and the first receiving unit 1101-1 is configured to receive a fax service IWF of the fax receiving party sent by the fax receiving party MSCe. Inter-office negotiation message in the direction. The first determining unit 1101-2 is configured to, after the first receiving unit 1101-1 receives the inter-office negotiation message sent by the fax receiver MSCe, according to the fax of the fax receiving party in the inter-office negotiation message The IWF direction of the service is known to require voice-to-fax service change, and the IWF direction of the local fax service is determined to be the fax sender.

The fax sender mobile switching center MSCe2 specifically includes: a fax signal detection requesting module 1106, a receiving module 1105, a second determining module 1104, and a voice to fax service change notification module 1103. The fax signal detection request module 1106 is configured to send a fax tone detection request during the establishment of a voice call. The receiving module 1105 is configured to receive an event notification that the fax receiver signal is detected by the fax receiver media gateway MGW. The second determining module 1104 is configured to determine, when the receiving module 1105 receives the event notification that the fax signal is detected, to notify the fax sender network side of the voice to fax service change information. The voice-to-fax service change notification module 1103 is configured to send the fax service IWF direction carrying the fax receiver to the MSCel when the second determining module 1104 determines that the voice-to-fax service change information needs to be notified to the fax sender network side. Inter-office negotiation news.

In the system, method and device according to the embodiment of the invention, the fax is received by fax The sender sends the service change information, triggers the fax sender to change the voice-to-fax service, and changes the voice-to-fax service based on the IP BSC. The user does not need to distinguish between different networking modes and does not need to distinguish the fax sender. It is handled differently from the fax receiver and is easy to use. In the above embodiment of the present invention, the MSCel, MSCe2 may also preferably be a softswitch mobile switching center.

Embodiments of the present invention also provide a computer program product for implementing the above-described voice service to fax service change method, apparatus and system. The computer program product includes a computer program code, which can implement one or more steps in the method of the present invention when running on a computer device to implement one or more modules in the system or device of the present invention and /unit. For example, the computer program code can implement one or more learned modules, notification modules, or one or more of the units at runtime.

The above computer program product can be stored in a computer readable medium such as a read only memory (ROM), a random access memory (RAM) or a flash memory. The computer program code can also be downloaded from the data network to the computer device, and the downloaded computer program code can replace or update the existing computer program code.

The embodiments described above are only preferred embodiments of the present invention, and the usual changes and substitutions made by those skilled in the art within the scope of the technical solutions of the present invention are included in the protection scope of the present invention.

Claims

Claim

A method for changing a voice service to a fax service, the method comprising: the fax sender mobile switching center MSCe transmitting a voice to a fax sender base station controller when learning that a voice to fax service change is required a service change notification to a fax, wherein the notification carries a fax service network interworking function unit IWF direction of the fax sender, so that the fax sender base station controller performs a voice service to fax service change according to the service change notification. .

2. The method according to claim 1, wherein the fax sender mobile switching center learns that the service change required to perform voice to fax includes:

The fax sender mobile switching center receives an inter-office negotiation message sent by the fax receiver mobile switching center, where the inter-office negotiation message carries the fax service IWF direction of the fax receiver;

The fax sender mobile switching center learns that the voice-to-fax service change needs to be performed according to the fax service IWF direction of the fax receiver in the inter-office negotiation message, and determines that the fax service IWF direction of the local end is the fax sender.

3. The method according to claim 2, wherein the fax sender mobile switching center further comprises: before receiving the inter-office negotiation message sent by the fax receiver mobile switching center:

When the fax receiver changes the voice to fax service, it sends a fax signal tone;

After the fax receiver terminal detects the fax signal tone, the fax receiver network side performs voice to fax change and sends the change bearer to the fax receiver mobile switching center to complete the fax receiver mobile switching center receiving. After the change bearer completion message, an inter-office negotiation message carrying the fax service IWF direction of the fax recipient is sent to the fax sender mobile switching center.

The method according to claim 2, wherein the fax sender mobile switching center further comprises: before receiving the inter-office negotiation message sent by the fax receiver mobile switching center: Sending a fax tone detection request during the establishment of the voice call;

After the fax receiver performs the change of the voice to fax service, the fax signal tone is sent;

After the fax receiver media gateway MGW detects the fax signal tone, it sends an event notification that the fax signal tone is detected to the fax receiver MSCe;

After receiving the event notification, the fax receiving mobile switching center sends an inter-office negotiation message carrying the fax service IWF direction of the fax receiving party to the fax sender mobile switching center.

The method according to claim 1, wherein the fax sender mobile switching center learns that the service change required for voice to fax includes:

Receiving, by the fax sender mobile switching center, an event notification of the detected fax signal tone sent by the fax sender MGW;

The fax sender mobile switching center notifies the service change that needs to be voice-to-fax according to the event notification that the fax signal is detected, and determines that the fax service IWF direction of the local end is the fax sender.

The method according to claim 5, wherein the fax sender mobile switching center further receives: before receiving the event notification of the fax signal sound sent by the fax sender media gateway, the method further comprises:

Sending a fax tone detection request during the establishment of the voice call;

After the fax sender media gateway detects the fax signal tone, it sends an event notification that the fax signal tone is detected to the fax sender mobile switching center.

The method according to claim 4 or 6, wherein the sending the fax tone detection request during the establishment of the voice call comprises:

In the process of establishing a voice call, sending a fax tone detection request to the fax sender media gateway, wherein the fax sender media gateway side is based on an IP bearer, and the other side is based on a time division multiplexed TDM bearer, and the contract is signed. Have IWF business.

8. The method of claim 1, wherein the method further comprises: The fax sender mobile switching center determines whether a service change occurs on the local access side. If no service change occurs on the fax sender access side, the fax sender base station controller is notified to perform a service change, and the fax is sent in the notification. The direction of the square IWF.

A system for changing a voice service to a fax service, wherein the system comprises: a fax sender mobile switching center, configured to send a voice to fax service when it learns that a voice to fax service change is required. a change notification, where the notification carries the fax service network interworking function unit IWF direction of the fax sender;

The fax sender base station controller is configured to receive a service change notification sent by the fax sender mobile switching center, and perform a voice to fax service change according to the received service change notification.

10. The system of claim 9, wherein the fax sender mobile switching center comprises:

The learning module is configured to learn that the fax sender needs to perform voice to fax service change; and the notification module is configured to send the voice to fax service change when the learning module learns that the fax sender needs to perform voice to fax service change The notification, wherein the notification carries the fax service IWF direction of the fax sender.

The system according to claim 10, wherein the learning module comprises: a first receiving unit, configured to receive an inter-office negotiation of a fax service IWF direction of a fax receiving party sent by a fax receiving mobile switching center; Message

a first determining unit, configured to: after the first receiving unit receives the inter-office negotiation message sent by the fax receiving mobile switching center, according to the fax service IWF direction of the fax receiving party in the inter-office negotiation message Perform voice-to-fax service changes and determine that the IWF direction of the local fax service is the fax sender.

The system of claim 10, wherein the learning module comprises: a fax tone detection request unit, configured to send a fax signal tone detection request during a voice call setup process;

a second receiving unit, configured to receive the detected fax signal sound sent by the fax sender media gateway Event notification

a second determining unit, configured to: after the second receiving unit receives the event notification that the fax signal is detected, according to the event notification that the fax signal is detected, to obtain a service change requiring voice to fax, and Determine the fax service IWF direction of the local end as the fax sender.

13. A device for implementing a voice service to a fax service change, wherein the device includes:

The learning module is configured to learn that the fax sender needs to perform voice to fax service change; and the notification module is configured to send the voice to fax service change when the learning module learns that the fax sender needs to perform voice to fax service change The notification, wherein the notification carries the fax service network interworking function unit IWF direction of the fax sender.

The device according to claim 13, wherein the learning module comprises: a first receiving unit, configured to receive an inter-office negotiation message carrying a fax service IWF direction of the fax receiving party;

a first determining unit, configured to: after the first receiving unit receives the inter-office negotiation message, learn, according to the fax service IWF direction of the fax receiver in the inter-office negotiation message, that a voice-to-fax service is required Change, and determine the fax service IWF direction of the local end is the fax sender.

The device according to claim 13, wherein the learning module comprises: a fax tone detection request unit, configured to send a fax signal tone detection request during a voice call setup process;

a second receiving unit, configured to receive an event notification that the fax sender signal is detected by the fax sender media gateway;

A voice to fax service change notification device, wherein the device comprises: a voice to fax service change notification module, configured to send an interoffice negotiation message to notify a fax transmission The party network side needs to perform voice to fax service change, and the inter-office negotiation message carries the fax service network interworking function unit IWF direction of the fax receiver.

The device according to claim 16, wherein the device further comprises: a first determining module, configured to determine, after receiving the fax receiver access side bearer change completion message, that the network needs to be sent to the fax sender network Side notification of voice to fax service change information;

And the voice-to-fax service change notification module sends an inter-office negotiation message carrying the fax service IWF direction of the fax receiver when the first determining module determines that the voice-to-fax service change information needs to be notified to the fax sender network side. .

The device according to claim 16, wherein the device further comprises: a fax signal detection requesting module, configured to send a fax signal tone detection request during the establishment of the voice call;

a receiving module, configured to receive an event notification of the detected fax tone sent by the fax receiver media gateway;

a second determining module, configured to: when the receiving module receives the event notification that the fax signal sound is detected, determine that the voice to fax service change information needs to be notified to the fax sender network side; then the voice to fax service change The notification module, when the second determining module determines that the voice to fax service change information needs to be notified to the fax sender network side, sends an interoffice negotiation message carrying the fax service IWF direction of the fax receiver.

19. A computer program product for a voice service to a fax service change, wherein the computer program product comprises:

Computer program code for performing the steps of the method of any of claims 1-8, or for implementing the system of any of claims 9-12, when it is run on a computer device One or more modules or units, or one or more modules or units in a device according to any of claims 13-15, or a device according to any of claims 16-18 One or more modules or units in .

20. A computer readable medium, characterized in that the computer readable medium stores a claim Said computer program,