CN101132461B - Method, system and equipment for implementing changing from voice business to fax business - Google Patents
Method, system and equipment for implementing changing from voice business to fax business Download PDFInfo
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- CN101132461B CN101132461B CN2007101198397A CN200710119839A CN101132461B CN 101132461 B CN101132461 B CN 101132461B CN 2007101198397 A CN2007101198397 A CN 2007101198397A CN 200710119839 A CN200710119839 A CN 200710119839A CN 101132461 B CN101132461 B CN 101132461B
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- facsimile
- fax
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- business
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/18—Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/333—Mode signalling or mode changing; Handshaking therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N2201/333—Mode signalling or mode changing; Handshaking therefor
- H04N2201/33307—Mode signalling or mode changing; Handshaking therefor of a particular mode
- H04N2201/33342—Mode signalling or mode changing; Handshaking therefor of a particular mode of transmission mode
Abstract
This invention provides a method, a system and a device for realizing alteration from phonetic service to fax, in which, the method includes: when a soft switch center of a fax transmission party gets to know it's necessary to alter service from phone to fax, it sends a notification to a control station of a base station carrying with IWF direction of the fax service of the fax transmission party, the control station converts the services according to the notification. This invention also provides a system and a device for realizing alteration from phonetic service to fax and an alteration informing device.
Description
Technical field
The present invention relates to the communications field, particularly a kind of method, system and equipment of realizing changing from voice business to fax business.
Background technology
IWF (Inter Working Function, Interworking Function) is a kind of equipment in the communication network, it supports the circuit domain data business communicating function of wireless network and other network, adopt with, asynchronous data carry out that long-range access, Email visit, Intranet insert, ISP (Interactive Session Protocol, the interactive agreement of meeting) access, common data library searching, two business such as data terminal interconnect.Wherein, other network comprises PSTN (Public Switched Telephone Network, public switch telephone network), ISDN (Integrated Services Digital Network, integrated services digital network), Internet, other PLMN (Public Land Mobile Network, PLMN) etc.
Referring to Fig. 1, be IWF networking mode based on TDM (Time Division Multiplexing, time division multiplexing) BSC (Base Station Controller, base station controller), two ends are TDM BSC, interoffice is carried as IP.At present, the user is extensive use of the business that first voice are faxed again, i.e. the advanced lang sound conversation of both sides is carried out facsimile service by business change again.
When the both sides of voice call need change to facsimile service with speech business, both sides are respectively by the fax initiating key, facsimile transmission side sends CNG (Calling Tone for the fax recipient, facsimile machine caller tone signal) signal tone, the fax recipient sends CED (Called Station Identification, called tation sign sound) signal tone for facsimile transmission side.Facsimile transmission side BSC initiates business change after detecting the CED signal, and fax recipient's terminal is initiated business change after detecting the CED signal that the facsimile machine that is attached thereto sends out.
Referring to Fig. 2, portable terminal is respectively MS1 and MS2, and links to each other with its local facsimile machine respectively.Concrete change step is as follows:
Step 101: two users are carrying out voice call by MS1 and MS2, and when needs changed to fax, both sides were respectively by the fax initiating key.
Step 102: the facsimile machine of facsimile transmission side sends CNG (Calling Tone, facsimile machine caller tone signal) signal tone for the fax recipient by MS1.
Step 103: fax recipient's facsimile machine sends CED (Called Station Identification, called tation sign sound) signal tone for facsimile transmission side by MS2.
Step 104: the facsimile machine of facsimile transmission side is set up IWF respectively with fax recipient's facsimile machine and is connected.
In the step 104, the concrete steps that fax recipient's facsimile machine is set up the IWF connection are as follows:
Step 104d: in execution in step 104c, fax recipient's MSCe2 and fax recipient's BSC2 carries out Signalling exchange, and MSCe2 notice fax recipient's BSC2 revises carrying.
In the above-mentioned steps 104, the concrete steps that the facsimile machine of facsimile transmission side is set up the IWF connection are as follows:
Step 104d ': in execution in step 104c ', the MSCe1 of facsimile transmission side and the BSC1 of facsimile transmission side carry out Signalling exchange, and the BSC1 of MSCe1 notice facsimile transmission side revises carrying.
Step 105: any one party of facsimile transmission side or facsimile transmission side begins to carry out interoffice after the MGW bearing modification finishes consults, and facsimile transmission side and fax recipient's MGW revises the interoffice carrying respectively.
The concrete steps of step 105 are as follows:
Step 106: after the interoffice bearing modification was finished, facsimile transmission side and fax recipient carried out Signalling exchange by IWF equipment, and after consulting to finish, receiving-transmitting sides begins facsimile posting.
Referring to Fig. 3, be IWF networking mode based on IP BSC, two ends are IP BSC, interoffice is carried as IP.When carrying out voice, still detect CED signal initiation business change by the terminal that links to each other with receiving side facsimile machine for the fax recipient to the business change of fax; But, can't carry out the CED signal tone and detect because IP BSC does not have TC (Transcode, transcoder) resource for facsimile transmission Fang Ze, therefore can not continue to use under the IWF networking mode of TDM BSC, detect the flow process that the CED signal is initiated business change by transmit leg BSC.In order to address the above problem, mainly adopt following scheme:
MSCe is configured to soft switch center, represents that with particular number the user changes to facsimile transmission side from audio call; The user is in calling procedure, in the time of need changing to facsimile transmission side, the user need send the FLASH message that has this particular number by agreement and arrive MSCe, check that by MSCe the user is dialled the number, if analyzing number, MSCe need change to facsimile transmission side for the user, then notify BSC to carry out business change, trigger facsimile transmission side's business change flow process.
To sum up, after adopting IP BSC, the fax receiver side can be finished business change by original treatment step, the interoffice IP carrying can be initiated business change by receiver side and finish bearing modification, but trigger the business change of facsimile transmission side for the FLASH that the business change of facsimile transmission side then needs facsimile transmission side user to send particular number, cause the complicated operation of business change.
Summary of the invention
The embodiment of the invention provides a kind of method, system and equipment of realizing changing from voice business to fax business, and described technical scheme is as follows:
A kind of method that realizes changing from voice business to fax business, described method comprises:
Facsimile transmission side's soft switch center is by the interoffice negotiation message of recipient's soft switch center transmission of receiving faxes or the event notice that detects facsimile signal sound that facsimile transmission side's media gateway sends, know need carry out voice to the fax business change the time, to the business change notice of facsimile transmission side's base station controller transmission carrying out voice, carry the facsimile service IWF direction of facsimile transmission side in the described notice to fax;
Facsimile transmission side's base station controller receives the business change notice that described facsimile transmission side soft switch center sends, and the service negotiation of initiation and facsimile transmission side's terminal carries out the business change of local terminal voice to fax.
A kind of system that realizes changing from voice business to fax business, described system comprises:
Facsimile transmission side's soft switch center, be used for by the interoffice negotiation message of recipient's soft switch center transmission of receiving faxes or the event notice that detects facsimile signal sound that facsimile transmission side's media gateway sends, know need carry out voice to the fax business change the time, the business change notice of voice to fax carried out in transmission, carries the facsimile service IWF direction of facsimile transmission side in the described notice;
Facsimile transmission side's base station controller is used to receive the business change notice that described facsimile transmission side soft switch center sends, and the service negotiation of initiation and facsimile transmission side's terminal carries out the business change of local terminal voice to fax.
A kind of equipment of realizing changing from voice business to fax business, described equipment is positioned at facsimile transmission side, comprising:
Know module, be used for knowing that by the interoffice negotiation message of recipient's soft switch center transmission of receiving faxes or the event notice that detects facsimile signal sound that facsimile transmission side's media gateway sends facsimile transmission side need carry out the business change of voice to fax;
Notification module is used for, sending and carrying out the business change notice of voice to fax when knowing that module knows that facsimile transmission side need carry out voice to the business change of fax described.
A kind of voice are to facsimile service Notification of Changes equipment, and described equipment is positioned at the fax recipient, comprising:
First determination module is used for receiving after the fax recipient inserts side carrying change and finish message, and determining need be to facsimile transmission side's network side notice voice to the facsimile service modification information;
Voice are used for determining and need sending the interoffice negotiation message of the facsimile service IWF direction of carrying the fax recipient when facsimile transmission side's network side is notified voice to the facsimile service modification information at described first determination module to facsimile service Notification of Changes module.
A kind of voice are to facsimile service Notification of Changes equipment, and described equipment is positioned at the fax recipient, comprising:
Facsimile signal detects request module, and the process that is used for setting up at audio call sends facsimile signal sound and detects request;
Receiver module, the event notice that detects facsimile signal sound that the receiving method, medium gateway that is used to receive faxes sends;
Second determination module is used for when described receiver module receives the described event notice that detects facsimile signal sound, and determining need be to facsimile transmission side's network side notice voice to the facsimile service modification information;
Voice are used for determining and need sending the interoffice negotiation message of the facsimile service IWF direction of carrying the fax recipient when facsimile transmission side's network side is notified voice to the facsimile service modification information at described second determination module to facsimile service Notification of Changes module.
The embodiment of the invention sends business change information by fax receive direction facsimile transmission side, triggers facsimile transmission side and carries out the change of voice to facsimile service, and is simple to operate, need not to send particular number for the user, easy to use.
Description of drawings
Fig. 1 is to be the IWF networking mode schematic diagram of IP based on interoffice under the networking mode of TDM BSC in the prior art;
Fig. 2 be in the prior art under the networking mode of TDM BSC the flow chart of changing from voice business to fax business;
Fig. 3 is to be the IWF networking mode schematic diagram of IP based on interoffice under the networking mode of IP BSC in the prior art;
Fig. 4 is to be the IWF networking mode schematic diagram of TDM based on interoffice under the networking mode of IP BSC in the prior art;
Fig. 5 is the IWF networking mode schematic diagram that docks with PSTN in the prior art;
Fig. 6 is to be the flow chart of changing from voice business to fax business in the IWF networking of IP carrying based on interoffice under the IP BSC in the embodiment of the invention 1;
Fig. 7 is to be the flow chart of changing from voice business to fax business in the IWF networking of TDM carrying based on interoffice under the IP BSC in the embodiment of the invention 2;
Fig. 8 be in the embodiment of the invention 3 in the IWF networking of IP BSC and PSTN butt joint the flow chart of changing from voice business to fax business;
Fig. 9 is the composition schematic diagram of facsimile transmission side and fax recipient MSCe under the networking mode of Fig. 3;
Figure 10 is the composition schematic diagram of facsimile transmission side MSCe under the networking mode of Fig. 4;
Figure 11 is the composition schematic diagram of facsimile transmission side and fax recipient MSCe under the networking mode of Fig. 5.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments, but the present invention is not limited to following examples.
Embodiment 1
The embodiment of the invention is by expanding interoffice SIP signaling, and band IWF direction is after access side generation business change on one side, by the INVITE transmission business change information of SIP signaling, notice opposite side MSCe, the IWF direction of band local terminal in the message; After opposite side MSCe receives,, initiate the business change of local terminal according to the IWF direction of opposite end.
Referring to Fig. 6, portable terminal is respectively MS1 and MS2, and links to each other with its local facsimile machine respectively.The flow process of changing from voice business to fax business is as follows under the IP BSC:
Step 301: two users are carrying out voice call, and when needs changed to fax, both sides were respectively by the fax initiating key.
Step 302: the facsimile machine of facsimile transmission side sends the CNG signal tone for the fax recipient by MS1.
Step 303: fax recipient's facsimile machine sends the CED signal tone for facsimile transmission side by MS2.
Step 304: fax recipient's MS2 revises carrying after detecting the CED signal that the facsimile machine that is attached thereto sends, and the IWF equipment and the recipient that faxes carry out Signalling exchange and set up IWF and be connected.Concrete steps are identical with step 104a-104e, repeat no more here.
Step 305: fax recipient's MSCe2 receives that fax recipient's MGW2 revises carrying and finishes message, beginning and facsimile transmission square tube are crossed the SIP signaling and are carried out the interoffice negotiation, and consult INVTIE message by interoffice and send business change information to the MSCe1 of facsimile transmission side, promptly in above-mentioned INVTIE message, Session Initiation Protocol is expanded, and carry the fax recipient the IWF direction, thereby inform transmit leg by INVTIE message, the IWF business change has taken place in the recipient.
Step 306: after facsimile transmission side MSCe1 receives INVITE, the IWF direction that obtains local terminal according to the IWF direction of the recipient in this INVITE is facsimile transmission side's (opposite with the recipient IWF direction in the INVITE), reinform local terminal BSC1 and carry out business change, carry transmit leg local terminal IWF direction in this notice, this IWF direction is facsimile transmission side.
The embodiment of the invention can be after facsimile transmission side MSCe1 receives INVITE, earlier judge whether transmit leg business change has taken place, business change does not also take place if the transmit leg local terminal inserts side, the IWF direction that can obtain local terminal according to the IWF direction in the INVITE is facsimile transmission side's (opposite with the recipient IWF direction in the INVITE), reinform facsimile transmission side BSC1 and carry out business change, and the IWF direction of in notice, carrying transmit leg, this IWF direction is facsimile transmission side.
Step 307: after facsimile transmission side BSC1 receives the notice of carrying out business change, the service negotiation of the terminal of initiation and facsimile transmission side, carry out the flow process identical then with the business change that the voice of finishing local terminal arrive fax, repeat no more here with step 104b '-104e '.
Step 308: interoffice is originally consulted to carry out as usual, and after interoffice SIP signaling consulted to finish, two innings of MSCe notified MGW to revise carrying respectively.This step is identical with step 105, repeats no more.
Step 309: after bearing modification was finished, facsimile transmission side and fax recipient carried out Signalling exchange by IWF equipment, and after consulting to finish, receiving-transmitting sides begins facsimile posting.
The embodiment of the invention is by expanding the SIP signaling, band fax recipient's IWF direction in the INVITE of SIP signaling, send to facsimile transmission side as business change information, trigger facsimile transmission side and carry out the change of voice to facsimile service, make under the networking mode of IP BSC voice simple to the alter operation of facsimile service, need not to distinguish different networking modes for the user, carry out different processing with the fax recipient thereby also need not to distinguish facsimile transmission side, easy to use.
Embodiment 2
Referring to Fig. 4, terminal is respectively MS1 and MS2, and links to each other with its local facsimile machine respectively, and two end office (EO)s are IP BSC, if interoffice is carried as TDM, traditional TDM relaying can't pass through SIP signaling business transferring modification information.
For addressing the above problem, can be in setting up the process of audio call, respectively notification call side and callee MGW the TDM side carried out facsimile signal sound detect.Provide the facsimile signal sound measuring ability by MGW, voice take place after the business change of fax in the fax recipient, send facsimile signal sound CED signal as business change information, MGW detects the facsimile signal sound that the TDM side is sent, and will notify MSCe to initiate business change to the IP side.
Referring to Fig. 7, the flow process of changing from voice business to fax business is as follows:
Step 401: in setting up the process of audio call, send the fax detection request.
Setting up in the process of audio call, if it all is IP that the MSCe of call transmitter and calling receiver judges its both sides respectively, then do not notify MGW to carry out fax detection, if a side is IP, opposite side is TDM, then MSCe sends facsimile signal sound and detects request when asking MGW to build carrying in setting up bearer messages, and described request represents to make MGW that the TDM side is carried out the facsimile signal sound detection.In the present embodiment, because the side of MSCe1 is IP, opposite side is TDM, when then MSCe1 request MGW1 builds carrying, carries facsimile signal sound and detect request in setting up bearer messages, allows MGW1 that the TDM side is carried out facsimile signal sound and detects.Because the side of MSCe2 is IP, opposite side is TDM, when then MSCe2 request MGW2 builds carrying, carries facsimile signal sound and detect request in setting up bearer messages, allows MGW2 that the TDM side is carried out facsimile signal sound and detects.
Step 402: both sides carry out voice call, and when needs changed to fax, both sides were respectively by the fax initiating key.
Step 403: the facsimile machine of facsimile transmission side sends the CNG signal tone for the fax recipient by terminal MS 1.
Step 404: fax recipient's facsimile machine sends the CED signal tone for facsimile transmission side by terminal MS 2.
Step 405: fax recipient's terminal MS 2 is revised carrying after detecting the CED signal that the facsimile machine that is attached thereto sends, and the IWF equipment and the recipient that faxes carry out Signalling exchange and set up IWF and be connected.Concrete steps are identical with step 104a-104e, repeat no more here.
Step 406: behind the call setup, MGW1 and MGW2 carry out facsimile signal sound respectively and detect.When the fax recipient carries out the change of voice to facsimile service, when sending the CED signal, this CED signal is that the IP side from MGW2 sends over, thereby MGW2 does not detect, MGW1 then detects the CED signal at TDM relay point, and the event notice that MGW1 will detect the CED signal sends to MSCe1.
After step 407:MSCe1 receives the MGW1 event notice, business change takes place in the opposite end office that determines TDM relaying correspondence, and the corresponding fax recipient of TDM relaying opposite end office, then business change takes place in MSCe1 notice BSC1, carry the IWF direction of MSCe1 end in this notice, this direction is facsimile transmission side's (opposite direction of the IWF direction of TDM relaying opposite end office correspondence).
Step 408: after facsimile transmission side BSC1 receives the notice of carrying out business change, the service negotiation of the terminal of initiation and facsimile transmission side, carry out the flow process identical then with the business change that the voice of finishing local terminal arrive fax, repeat no more here with step 104b '-104e '.
Step 409: after bearing modification was finished, facsimile transmission side and fax recipient carried out Signalling exchange by IWF equipment, and after consulting to finish, receiving-transmitting sides begins facsimile posting.
The embodiment of the invention detects by increasing facsimile signal sound, the facsimile signal sound that the fax recipient is sent sends to facsimile transmission side as business change information, trigger facsimile transmission side and carry out the business change of voice to fax, making at interoffice is that voice are simple to the alter operation of facsimile service under the IPBSC networking mode of TDM, need not to distinguish different networking modes for the user, carry out different processing thereby also need not to distinguish facsimile transmission side with the fax recipient, easy to use.
Carry out the detection of facsimile signal sound owing to only require the media gateway of signatory facsimile service, rather than require all media gateway to carry out the detection of facsimile signal sound, saved Internet resources.
Embodiment 3
Referring to Fig. 5, under the networking mode of IP BSC and PSTN butt joint, when IP BSC side is facsimile transmission side, PSTN is the fax recipient, when the fax recipient is carrying out the business change of voice to fax, can send the CED signal to facsimile transmission side, because the BSC of facsimile transmission side can't detect the CED signal, and the MSCe of tandem exchange can't be known business change information from the PSTN side.
For addressing this problem, can take embodiment 2 to detect the method for facsimile signal, difference is, need expansion SIP signaling, to transmit the fax detection request, after MGW detected facsimile signal and notifies MSCe, MSCe need send to the information of business change the MSCe of facsimile transmission side in INVITE, and the BSC that the MSCe of facsimile transmission side reinforms local terminal carries out the change of voice to facsimile service.
Referring to Fig. 8, voice are as follows to the facsimile service flow process under the networking mode of IP BSC and PSTN butt joint:
Step 501: in setting up the process of audio call, the expansion INVITE carries the fax detection request in INVITE.
The detailed process of this step is as follows:
1) user makes a call under IP BSC, and BSC1 sends call request to MSCe1.
2) MSCe1 request MGW1 builds carrying: set up MGW1 and BSC1 and insert carrying that side links to each other, set up interoffice and carry.
3) MGW1 sets up to carry and finishes, and sends to set up to carry to MSCe1 and finishes response.
4) MSCe1 request BSC1 sets up the carrying of eating dishes without rice or wine between channel and MGW1 and BSC1.
5) BSC1 sets up eat dishes without rice or wine channel and carrying and finishes notice MSCe1.
The embodiment of the invention has increased following steps:
If when IP BSC lateral terminal makes a call, when the MSCe of call initiator sends INVITE request foundation calling to opposite end office, MSCe judges that it is IP BSC that local exchange inserts side, and user's IWF business of having contracted, and then carries the fax detection request in INVITE.
If when the TDM side is initiated audio call, then when the MSCe of IP BSC side when opposite end office sends response 200OK to INVITE, MSCe judges that it is IP BSC that local exchange inserts side, and user's IWF business of having contracted, and then carries the fax detection request in the response message of INVITE.
Make a call for IP BSC lateral terminal in the present embodiment.
If it all is IP that MSCe judges its both sides, then do not notify MGW to carry out fax detection, if a side is IP, one side is TDM, then when request MGW builds carrying, in setting up bearer messages, carry facsimile signal sound and detect request, allow MGW that the TDM side is carried out facsimile signal sound and detect.In the present embodiment, because the both sides of MSCe1 all are IP, when then MSCe1 request MGW1 builds carrying, do not allow MGW1 carry out facsimile signal sound and detect.
After the MSCe of tandem exchange receives the INVITE that carries the fax detection request, judge its both sides, if both sides all are IP, then do not notify MGW to carry out fax detection, transparently-transmitted fax detects request when its transmission INVITE of office call request.If a side is IP, a side is TDM, then when building carrying with fax recipient MGW, carries facsimile signal sound and detect request in setting up bearer messages, allows MGW that the TDM side is carried out facsimile signal sound and detects.In the present embodiment, because the side of MSCe2 is IP, opposite side is TDM, when then MSCe2 request MGW2 builds carrying, carries facsimile signal sound and detect request in setting up bearer messages, allows MGW2 carry out facsimile signal sound and detects.
Step 502: both sides carry out voice call, and when needs changed to fax, both sides were respectively by the fax initiating key.
Step 503: the facsimile machine of facsimile transmission side sends the CNG signal tone for the fax recipient by terminal MS 1.
Step 504: fax recipient's facsimile machine sends the CED signal tone for facsimile transmission side by terminal MS 2.
Step 505: behind the call setup, MGW2 detects the TDM side and whether sends the fax detection sound.When the fax recipient carries out the change of voice to facsimile service, when sending the CED signal, MGW2 detects the CED signal tone that opposite end office brings at TDM relay point, determine that then business change takes place in the opposite end, and the opposite end is the fax recipient, and the event notice that MGW2 will detect the CED signal sends to MSCe2.
After step 506:MSCe2 receives the MGW2 event notice, business change takes place in the opposite end office that determines TDM relaying correspondence, and the corresponding fax recipient of TDM relaying opposite end office, then MSCe2 sends INVITE at the IP trunk side to MSCe1 and requires to carry out business change, wherein this INVITE carries the IWF direction of opposite end, and this direction is fax recipient's (IWF direction of TDM relaying opposite end office correspondence).
Step 507-510: opposite side MSCe1 receives the INVITE that requires business change, and subsequent treatment is identical with step 306-309 among the embodiment 1, repeats no more.
The invention described above embodiment facsimile transmission side MSCe1 can also judge whether transmit leg business change has taken place earlier, business change does not also take place if the transmit leg local terminal inserts side, then notify facsimile transmission side BSC to carry out business change, and the IWF direction of in notice, carrying transmit leg, if the transmit leg local terminal inserts side business change having taken place, does not then reinform facsimile transmission side BSC1 and carry out business change.
The embodiment of the invention detects by increasing facsimile signal sound, the fax recipient sends facsimile signal sound as business change information, tandem exchange sends the INVITE of the IWF direction that has the recipient that faxes to facsimile transmission side by the SIP signaling after receiving facsimile signal sound again, trigger facsimile transmission side and carry out the change of voice to facsimile service, make under the IP BSC networking of docking voice simple to the alter operation of facsimile service with PSTN, need not to distinguish different networking modes for the user, carry out different processing thereby also need not to distinguish facsimile transmission side with the fax recipient, easy to use.The embodiment of the invention is owing to only detect the user of the facsimile service of having contracted, thereby can reduce taking Internet resources.
For realizing the above embodiment of the present invention, need carry out following expansion to SIP:
(1) the SIP signaling is expanded, made it carry the IWF direction.
(2) the SIP signaling is expanded, made it carry the fax detection request.
Can carry the IWF direction by increasing attribute, such as:
With following attribute representation facsimile transmission side:
a＝IwfCaller
With the following attribute representation recipient that faxes:
a＝IwfCalled
For example:
INVITE?sip：8712345@127.0.0.1:5061；User＝phone?SIP/2.0
Allow：INVITE，ACK，BYE，CANCEL，COMET，PRACK，UPDATE
Supported：update，100rel
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：1INVITE
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?49178RTP/AVP?0
a＝fax
a＝IwfCalled
Can carry the fax detection request by expanding a new header field, as: Request (request), its concrete structure is defined as follows:
Request＝″Request″HCOLON?request-tag*(COMMA?request-tag)
And tag value IwfDetect of newly-increased definition, expression requires facsimile signal to detect.As:
Request＝IwfDetect
For setting up audio call, require to carry out fax detection, INVITE 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，100rel
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：1INVITE
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?49178RTP/AVP?8?0
a＝rtpmap:8PCMA/8000
a＝rtpmap:0PCMU/8000。
The embodiment of the invention also provides a kind of system that realizes changing from voice business to fax business, is elaborated below by embodiment 4, embodiment 5 and 6 pairs of system embodiments of embodiment:
Embodiment 4
Referring to the networking mode of Fig. 3, the system of the realization changing from voice business to fax business that present embodiment provides comprises: facsimile transmission side soft switch center MSCe1, facsimile transmission side's media gateway MGW 1, fax recipient soft switch center MSCe2, fax receiving method, medium gateway MGW2; Both sides carry out voice call, when needs change to fax, both sides are respectively by the fax initiating key, and the facsimile machine of facsimile transmission side sends the CNG signal tone for the fax recipient by terminal MS 1, and fax recipient's facsimile machine sends the CED signal tone for facsimile transmission side by terminal MS 2;
After fax recipient's MS2 detects the CED signal that the facsimile machine that is attached thereto sends, revise carrying, IWF equipment and fax recipient carry out Signalling exchange and set up IWF and is connected, and send to carry to change to fax recipient's MSCe2 and finish message; Described MSCe2 receives after described carrying finishes message, need to determine the notice opposite end to carry out the change of voice to fax, cross the SIP signaling with the facsimile transmission square tube and carry out the interoffice negotiation, and consult INVTIE message by interoffice and notify to the MSCe1 of facsimile transmission side transmission business change, in above-mentioned INVTIE message, Session Initiation Protocol is expanded, and carry recipient's the IWF direction of faxing, thus inform transmit leg by INVTIE message, the IWF business change has taken place in the recipient;
After facsimile transmission side MSCe1 receives INVITE, the IWF direction that obtains local terminal according to the IWF direction of the recipient in this INVITE is facsimile transmission side, reinform local terminal BSC1 and carry out business change, carry transmit leg local terminal IWF direction in this notice, BSC1 receives voice behind the facsimile service Notification of Changes, carries out the corresponding business change.
Referring to Fig. 9, Fig. 9 is the composition schematic diagram of facsimile transmission side soft switch center MSCe1 and fax recipient soft switch center MSCe2 under the networking mode of Fig. 3, in the present embodiment, facsimile transmission side soft switch center MSCe1 specifically comprises knows module and notification module, the described interoffice negotiation message of knowing the facsimile service IWF direction of carrying the fax recipient that recipient MSCe2 sends that is used to module to receive faxes, when knowing that according to described interoffice negotiation message needs carry out voice to the business change of fax, described notification module is used for carrying out the business change notice of voice to fax by the interoffice negotiation message that the facsimile service IWF direction of facsimile transmission side is carried in transmission; Describedly know that module specifically comprises first receiving element and first determining unit, described first receiving element be used to the to receive faxes interoffice negotiation message of the facsimile service IWF direction of carrying the fax recipient that recipient MSCe sends, described first determining unit, be used for after described first receiving element receives the interoffice negotiation message of fax recipient MSCe transmission, assist the facsimile service IWF direction of the fax recipient in the negotiation message to know that needs carry out the business change of voice to fax according to described interoffice, and the facsimile service IWF direction of definite local terminal is facsimile transmission side.
Fax recipient soft switch center MSCe2 comprises that first determination module and voice are to facsimile service Notification of Changes module, described first determination module is used for receiving after the fax recipient inserts side carrying change and finish message, and determining need be to facsimile transmission side's network side notice voice to the facsimile service modification information; Described voice are determined and need be sent the interoffice negotiation message of the facsimile service IWF direction of carrying the fax recipient when facsimile transmission side's network side is notified voice to the facsimile service modification information at described first determination module to facsimile service Notification of Changes module.
Embodiment 5
Referring to the networking mode of Fig. 4, realize that the system of changing from voice business to fax business comprises: facsimile transmission side soft switch center MSCe1, facsimile transmission side's media gateway MGW 1, fax recipient soft switch center MSCe2, fax receiving method, medium gateway MGW2;
Setting up in the process of audio call, the MSCe of call transmitter and calling receiver judges MGW1 and MGW2 respectively, if the one side is IP, opposite side is TDM, then MSCe is when request MGW builds carrying, send facsimile signal sound and detect request in setting up bearer messages, described request represents to make MGW that the TDM side is carried out the facsimile signal sound detection;
Both sides carry out voice call, when needs change to fax, both sides are respectively by the fax initiating key, and the facsimile machine of facsimile transmission side sends the CNG signal tone for the fax recipient by terminal MS 1, and fax recipient's facsimile machine sends the CED signal tone for facsimile transmission side by terminal MS 2;
The CED signal is that the IP side from MGW2 sends over, and MGW1 detects the CED signal at TDM relay point, and the event notice that MGW1 will detect the CED signal sends to MSCe1;
After MSCe1 receives the described event notice of MGW1 transmission, business change takes place in the opposite end office that determines TDM relaying correspondence, and the corresponding fax recipient of TDM relaying opposite end office, know and to carry out the change of voice to fax, then business change takes place in MSCe1 notice BSC1, carry the IWF direction of MSCe1 end in this notice, BSC1 receives voice behind the facsimile service Notification of Changes, carries out the corresponding business change.
Referring to Figure 10, Figure 10 is the composition schematic diagram of facsimile transmission side soft switch center MSCe1 under the networking mode of Fig. 4, in the present embodiment, facsimile transmission side soft switch center MSCe1 specifically comprises knows module and notification module, describedly know the event notice that detects the CED signal that is used to module to receive faxes transmit leg MGW1 sends, know that according to described event notice needs carry out the business change of voice to fax, described notification module is used for carrying out the business change notice of voice to fax by the interoffice negotiation message that the facsimile service IWF direction of facsimile transmission side is carried in transmission; Describedly know that module comprises that specifically facsimile signal detects request unit, second receiving element and second determining unit, described facsimile signal detects process that request unit is used for setting up at audio call and sends facsimile signal sound and detect request; Described second receiving element, the event notice that detects facsimile signal sound that the transmit leg media gateway MGW that is used to receive faxes sends; Described second determining unit, be used for after described second receiving element receives the described event notice that detects facsimile signal sound, know that according to the described event notice that detects facsimile signal sound needs carry out the business change of voice to fax, and the facsimile service IWF direction of definite local terminal is facsimile transmission side.
Embodiment 6
Referring to Fig. 5, be networking mode, realize that the service system of changing from voice business to fax business comprises: facsimile transmission side soft switch center MSCe1, facsimile transmission side's media gateway MGW 1, fax recipient soft switch center MSCe2, fax receiving method, medium gateway MGW2 in IP BSC and PSTN butt joint;
With embodiment 5, setting up in the process of audio call, the MSCe of call transmitter and calling receiver judges MGW1 and MGW2 respectively, if the one side is IP, opposite side is TDM, then MSCe sends facsimile signal sound and detects request when asking MGW to build carrying in setting up bearer messages, and described request represents to make MGW that the TDM side is carried out the facsimile signal sound detection;
Both sides carry out voice call, when needs change to fax, both sides are respectively by the fax initiating key, and the facsimile machine of facsimile transmission side sends the CNG signal tone for the fax recipient by terminal MS 1, and fax recipient's facsimile machine sends the CED signal tone for facsimile transmission side by terminal MS 2;
The CED signal is that the IP side from MGW2 sends over, and MGW2 detects the CED signal tone that opposite end office brings at TDM relay point, and the event notice that MGW2 will detect the CED signal sends to MSCe2;
After MSCe2 receives the MGW2 event notice, business change takes place in the opposite end office that determines TDM relaying correspondence, and the corresponding fax recipient of TDM relaying opposite end office, then MSCe2 requires to carry out business change to MSCe1 transmission INVITE at the IP trunk side, and wherein this INVITE carries the IWF direction of opposite end;
MSCe1 receives the INVITE that requires business change, know and need carry out the change of voice to fax, then business change takes place in MSCe1 notice BSC1, carries the IWF direction of MSCe1 end in this notice, BSC1 receives voice behind the facsimile service Notification of Changes, carries out the corresponding business change.
Referring to Figure 11, Figure 11 is the composition schematic diagram of facsimile transmission side soft switch center MSCe1 and fax recipient soft switch center MSCe2 under the networking mode of Fig. 5, in the present embodiment, facsimile transmission side soft switch center MSCe1 specifically comprises knows module and notification module, the described interoffice negotiation message of knowing the facsimile service IWF direction of carrying the fax recipient that recipient MSCe2 sends that is used to module to receive faxes, know that according to described interoffice negotiation message needs carry out the business change of voice to fax, described notification module is used for carrying out the business change notice of voice to fax by the interoffice negotiation message that the facsimile service IWF direction of facsimile transmission side is carried in transmission; Describedly know that module specifically comprises first receiving element and first determining unit, described first receiving element be used to the to receive faxes interoffice negotiation message of the facsimile service IWF direction of carrying the fax recipient that recipient MSCe sends, described first determining unit, be used for after described first receiving element receives the interoffice negotiation message of fax recipient MSCe transmission, assist the facsimile service IWF direction of the fax recipient in the negotiation message to know that needs carry out the business change of voice to fax according to described interoffice, and the facsimile service IWF direction of definite local terminal is facsimile transmission side.
The facsimile signal that specifically comprises facsimile transmission side soft switch center MSCe2 detects request module, receiver module, second determination module and voice to facsimile service Notification of Changes module, and described facsimile signal detects request module and is used for sending facsimile signal sound detection request in the process of audio call foundation; The described receiver module event notice that detects facsimile signal sound that receiving method, medium gateway MGW sends that is used to receive faxes; Described second determination module is used for when described receiver module receives the described event notice that detects facsimile signal sound, and determining need be to facsimile transmission side's network side notice voice to the facsimile service modification information; Described voice are determined and need be sent the interoffice negotiation message of the facsimile service IWF direction of carrying the fax recipient when facsimile transmission side's network side is notified voice to the facsimile service modification information at described second determination module to facsimile service Notification of Changes module.
The described system and method for the embodiment of the invention, facsimile transmission side sends business change information by the fax receive direction, trigger facsimile transmission side and carry out the change of voice to facsimile service, make based on the voice of IP BSC simple to the alter operation of facsimile service, need not to distinguish different networking modes for the user, also need not to distinguish facsimile transmission side and carry out different processing with the fax recipient, easy to use.
Above-described embodiment is a more preferably embodiment of the present invention, and common variation that those skilled in the art carries out in the technical solution of the present invention scope and replacement all should be included in protection scope of the present invention.
Claims (17)
1. a method that realizes changing from voice business to fax business is characterized in that, described method comprises:
Facsimile transmission side's soft switch center is by the interoffice negotiation message of recipient's soft switch center transmission of receiving faxes or the event notice that detects facsimile signal sound that facsimile transmission side's media gateway sends, know need carry out voice to the fax business change the time, to the business change notice of facsimile transmission side's base station controller transmission carrying out voice, carry the facsimile service IWF direction of facsimile transmission side in the described notice to fax;
Facsimile transmission side's base station controller receives the business change notice that described facsimile transmission side soft switch center sends, and the service negotiation of initiation and facsimile transmission side's terminal carries out the business change of local terminal voice to fax.
2. a kind of method that realizes changing from voice business to fax business as claimed in claim 1, it is characterized in that, described facsimile transmission side soft switch center knows that by the interoffice negotiation message that the recipient's soft switch center of receiving faxes sends need carry out voice specifically comprises to the business change of faxing:
The described facsimile transmission side soft switch center interoffice negotiation message that recipient's soft switch center sends of receiving faxes, described interoffice negotiation message is carried fax recipient's facsimile service IWF direction;
Described facsimile transmission side soft switch center knows that according to the facsimile service IWF direction of the fax recipient in the described interoffice negotiation message needs carry out the business change of voice to fax, and the facsimile service IWF direction of definite local terminal is facsimile transmission side.
3. the method for realization changing from voice business to fax business as claimed in claim 2 is characterized in that, described facsimile transmission side soft switch center is received faxes and further comprised before the interoffice negotiation message that recipient's soft switch center sends:
When the fax recipient carries out voice to the change of facsimile service, the transmission facsimile signal sound;
After described fax receiving side terminal detected described facsimile signal sound, fax recipient network side carried out voice and finishes message to the change of fax and to described fax recipient soft switch center transmission change carrying;
Described fax recipient soft switch center receives after change carrying finishes message, sends the interoffice negotiation message of the facsimile service IWF direction of carrying the fax recipient to described facsimile transmission side soft switch center.
4. the method for realization changing from voice business to fax business as claimed in claim 2 is characterized in that, described facsimile transmission side soft switch center is received faxes and further comprised before the interoffice negotiation message that recipient's soft switch center sends:
In the process that audio call is set up, send facsimile signal sound and detect request;
The fax recipient carries out voice to facsimile service after changing, sends facsimile signal sound;
After described fax recipient MGW detects described facsimile signal sound, send the event notice that detects facsimile signal sound to described fax recipient soft switch center MSCe;
After described fax recipient soft switch center receives described event notice, send the interoffice negotiation message of the facsimile service IWF direction of carrying the fax recipient to described facsimile transmission side soft switch center.
5. the method for realization changing from voice business to fax business as claimed in claim 1, it is characterized in that, described facsimile transmission side soft switch center knows that by the event notice that detects facsimile signal sound that the transmit leg media gateway of receiving faxes sends need carry out voice specifically comprises to the business change of faxing:
Described facsimile transmission side soft switch center receives the event notice that detects facsimile signal sound that described facsimile transmission side media gateway sends;
Described facsimile transmission side soft switch center knows that according to the described event notice that detects facsimile signal sound needs carry out the business change of voice to fax, and the facsimile service IWF direction of definite local terminal is facsimile transmission side.
6. the method for realization changing from voice business to fax business as claimed in claim 5, it is characterized in that the event notice that detects facsimile signal sound that described facsimile transmission side soft switch center receives the media gateway transmission of described facsimile transmission side further comprises before:
In the process that audio call is set up, send facsimile signal sound and detect request;
When the fax recipient carries out voice to the change of facsimile service, the transmission facsimile signal sound;
After described facsimile transmission side media gateway detects described facsimile signal sound, send the event notice that detects facsimile signal sound to described facsimile transmission side soft switch center.
7. as the method for claim 4 or 6 described realization changing from voice business to fax business, it is characterized in that the described facsimile signal sound that sends detects request and specifically comprises in the process that audio call is set up:
In the process that audio call is set up, be IP to inserting side one side, opposite side is that the media gateway of TDM sends facsimile signal sound detection request.
8. as the method for claim 1,2 or 5 any described realization changing from voice business to fax business, it is characterized in that described facsimile transmission side soft switch center knows that need carry out voice arrives after the business change of faxing, and further comprises:
Described facsimile transmission side soft switch center judges that local terminal inserts side whether business change takes place, business change does not also take place if facsimile transmission side inserts side, then notify facsimile transmission side's base station controller to carry out business change, and in notice, carry the IWF direction of facsimile transmission side.
9. a system that realizes changing from voice business to fax business is characterized in that, described system comprises:
Facsimile transmission side's soft switch center, be used for by the interoffice negotiation message of recipient's soft switch center transmission of receiving faxes or the event notice that detects facsimile signal sound that facsimile transmission side's media gateway sends, know need carry out voice to the fax business change the time, the business change notice of voice to fax carried out in transmission, carries the facsimile service IWF direction of facsimile transmission side in the described notice;
Facsimile transmission side's base station controller is used to receive the business change notice that described facsimile transmission side soft switch center sends, and the service negotiation of initiation and facsimile transmission side's terminal carries out the business change of local terminal voice to fax.
10. system as claimed in claim 9 is characterized in that, described facsimile transmission side soft switch center specifically comprises:
Know module, be used for knowing that by the interoffice negotiation message of recipient's soft switch center transmission of receiving faxes or the event notice that detects facsimile signal sound that facsimile transmission side's media gateway sends facsimile transmission side need carry out the business change of voice to fax;
Notification module is used for, sending and carrying out the business change notice of voice to fax when knowing that module knows that facsimile transmission side need carry out voice to the business change of fax described.
11. system as claimed in claim 10 is characterized in that, describedly knows that module specifically comprises:
First receiving element, the interoffice negotiation message of the facsimile service IWF direction of carrying the fax recipient that the recipient's soft switch center that is used to receive faxes sends;
First determining unit, be used for after described first receiving element receives the interoffice negotiation message of fax recipient soft switch center transmission, assist the facsimile service IWF direction of the fax recipient in the negotiation message to know that needs carry out the business change of voice to fax according to described interoffice, and the facsimile service IWF direction of definite local terminal is facsimile transmission side.
12. system as claimed in claim 10 is characterized in that, describedly knows that module specifically comprises:
Facsimile signal detects request unit, and the process that is used for setting up at audio call sends facsimile signal sound and detects request;
Second receiving element, the event notice that detects facsimile signal sound that the transmit leg media gateway that is used to receive faxes sends;
Second determining unit, be used for after described second receiving element receives the described event notice that detects facsimile signal sound, know that according to the described event notice that detects facsimile signal sound needs carry out the business change of voice to fax, and the facsimile service IWF direction of definite local terminal is facsimile transmission side.
13. an equipment of realizing changing from voice business to fax business is characterized in that, described equipment is positioned at facsimile transmission side, comprising:
Know module, be used for knowing that by the interoffice negotiation message of recipient's soft switch center transmission of receiving faxes or the event notice that detects facsimile signal sound that facsimile transmission side's media gateway sends facsimile transmission side need carry out the business change of voice to fax;
Notification module is used for, sending and carrying out the business change notice of voice to fax when knowing that module knows that facsimile transmission side need carry out voice to the business change of fax described.
14. equipment as claimed in claim 13 is characterized in that, describedly knows that module specifically comprises:
First receiving element is used to receive the interoffice negotiation message of facsimile service IWF direction of carrying the fax recipient;
First determining unit, be used for after described first receiving element receives described interoffice negotiation message, assist the facsimile service IWF direction of the fax recipient in the negotiation message to know that needs carry out the business change of voice to fax according to described interoffice, and the facsimile service IWF direction of definite local terminal is facsimile transmission side.
15. equipment as claimed in claim 13 is characterized in that, describedly knows that module specifically comprises:
Facsimile signal detects request unit, and the process that is used for setting up at audio call sends facsimile signal sound and detects request;
Second receiving element, the event notice that detects facsimile signal sound that the transmit leg media gateway that is used to receive faxes sends;
Second determining unit, be used for after described second receiving element receives the described event notice that detects facsimile signal sound, know that according to the described event notice that detects facsimile signal sound needs carry out the business change of voice to fax, and the facsimile service IWF direction of definite local terminal is facsimile transmission side.
16. voice is characterized in that to facsimile service Notification of Changes equipment described equipment is positioned at the fax recipient, comprising:
First determination module is used for receiving after the fax recipient inserts side carrying change and finish message, and determining need be to facsimile transmission side's network side notice voice to the facsimile service modification information;
Voice are used for determining and need sending the interoffice negotiation message of the facsimile service IWF direction of carrying the fax recipient when facsimile transmission side's network side is notified voice to the facsimile service modification information at described first determination module to facsimile service Notification of Changes module.
17. voice is characterized in that to facsimile service Notification of Changes equipment described equipment is positioned at the fax recipient, comprising:
Facsimile signal detects request module, and the process that is used for setting up at audio call sends facsimile signal sound and detects request;
Receiver module, the event notice that detects facsimile signal sound that the receiving method, medium gateway that is used to receive faxes sends;
Second determination module is used for when described receiver module receives the described event notice that detects facsimile signal sound, and determining need be to facsimile transmission side's network side notice voice to the facsimile service modification information;
Voice are used for determining and need sending the interoffice negotiation message of the facsimile service IWF direction of carrying the fax recipient when facsimile transmission side's network side is notified voice to the facsimile service modification information at described second determination module to facsimile service Notification of Changes module.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101198397A CN101132461B (en) | 2007-08-01 | 2007-08-01 | Method, system and equipment for implementing changing from voice business to fax business |
| PCT/CN2008/071648 WO2009015576A1 (en) | 2007-08-01 | 2008-07-15 | Method, system and device for changing voice service to fax service |
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| CN2007101198397A CN101132461B (en) | 2007-08-01 | 2007-08-01 | Method, system and equipment for implementing changing from voice business to fax business |
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| CN101132461A CN101132461A (en) | 2008-02-27 |
| CN101132461B true CN101132461B (en) | 2010-09-29 |
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| CN101132461B (en) * | 2007-08-01 | 2010-09-29 | 华为技术有限公司 | Method, system and equipment for implementing changing from voice business to fax business |
| CN101262706B (en) * | 2008-04-21 | 2012-07-18 | 中兴通讯股份有限公司 | Realization method for voice switch to fax service |
| CN101316393B (en) * | 2008-07-14 | 2011-06-22 | 中兴通讯股份有限公司 | Method and system for implementing change from speech service to fax service |
| CN101330669B (en) * | 2008-07-24 | 2013-06-05 | 中兴通讯股份有限公司 | Method and system for implementing transfer of voice to fax business based on CDMA2000 mobile communication system |
| WO2013091216A1 (en) * | 2011-12-22 | 2013-06-27 | 华为技术有限公司 | Fax indication method and switch device |
| CN104539520A (en) * | 2014-12-27 | 2015-04-22 | 宁波江东远通计算机有限公司 | Message sending management method and device |
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| CN1801874A (en) * | 2005-01-07 | 2006-07-12 | 华为技术有限公司 | Method for realizing voice service switching to fax service |
| CN1870710A (en) * | 2005-10-20 | 2006-11-29 | 华为技术有限公司 | Method for transmitting fax from fixed network to mobile network |
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| US6125276A (en) * | 1996-09-06 | 2000-09-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Inter-exchange signaling for in-call service change requests |
| US6075847A (en) * | 1999-02-10 | 2000-06-13 | Qualcomm Inc. | Method and apparatus for detection of fax calls |
| US6748239B1 (en) * | 1999-12-01 | 2004-06-08 | Ericsson Inc. | Methods and systems for communicating service codes over a PSTN using single stage dialing |
| RU2235444C2 (en) * | 2000-12-21 | 2004-08-27 | Эл Джи Электроникс Инк. | Device and method for transmitting facsimile data in voice communication system |
| CN101132461B (en) * | 2007-08-01 | 2010-09-29 | 华为技术有限公司 | Method, system and equipment for implementing changing from voice business to fax business |
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| CN1801874A (en) * | 2005-01-07 | 2006-07-12 | 华为技术有限公司 | Method for realizing voice service switching to fax service |
| CN1870710A (en) * | 2005-10-20 | 2006-11-29 | 华为技术有限公司 | Method for transmitting fax from fixed network to mobile network |
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