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Method, device and system for switching from fax channel to voice channel

A voice channel and channel switching technology, which is applied in the field of communication, can solve the problems of silence detection duration and threshold setting difficulties, fax failure, and unable to switch voice normally, so as to ensure high-quality experience, improve success rate and stability.

Active Publication Date: 2019-04-09
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of high background noise or some extreme test conditions of the bureau, the fax machine itself has switched to the voice mode, and the silence detection cannot take effect at this time, resulting in the failure of the gateway switching, and the user cannot enter the call state after the fax is over.
At the same time, it is difficult to set the duration and threshold of silence detection. There is a certain amount of experience. Different parameter settings sometimes cause the fax to switch back to voice during the fax process and fail to fax, and sometimes lead to the failure to switch to voice after the fax ends.
Therefore, the stability of the traditional T.38 fax switching back to voice is poor
[0007] Aiming at the poor stability of the way of T.38 fax switching back to voice in the related technology, no effective solution has been proposed so far

Method used

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  • Method, device and system for switching from fax channel to voice channel
  • Method, device and system for switching from fax channel to voice channel
  • Method, device and system for switching from fax channel to voice channel

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0051] In this embodiment, the switching process in the process of sending T.38 fax packets is taken as an example for illustration. Figure 4 It is the flow chart of the handover processing in this embodiment, such as Figure 4 As shown, it mainly includes the following steps:

[0052] Step 401, each time the system's 10ms scheduling period is up, obtain data from the local fax machine;

[0053] Step 402, the T.38 demodulation module starts to demodulate the acquired data, the data obtained after each demodulation is accumulated, and the data content is judged each time;

[0054] Step 403, after the current data demodulation, accumulation and judgment, determine whether it is a DCN signal of a fax, if yes, execute step 404, if not, execute step 405;

[0055] Step 404: After determining that it is a DCN signal, the signal is packaged and sent according to the T.38 protocol, and the fax end event of the service is reported at the same time, and then step 410 is executed accor...

Embodiment 2

[0063] In this embodiment, the switching process in the process of receiving T.38 fax packets is taken as an example for illustration. Figure 5 It is a flow chart of switching processing in this embodiment, such as Figure 5 As shown, it mainly includes the following steps:

[0064] Step 501, after the 10ms scheduling period of the system arrives each time, read the IP packets on the network, and perform step 2 after the unpacking operation;

[0065] Step 502, judging whether the T.38 packet sent by the correct remote end has been received, if yes, execute step 503, if not, execute step 504;

[0066] Step 503, it shows that the facsimile information is still being transmitted at this time, clear the packet sending counter A and the packet receiving counter B, prepare to count again, and return to step 501;

[0067] Step 504, at this time, it shows that no T.38 packet has been received from the remote facsimile at the current moment, and it is necessary to add 1 to the recei...

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PUM

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Abstract

The invention discloses a switching method, device and system from a facsimile channel to a voice channel. Wherein, the method includes: after entering the T.38 fax, counting the first number of scheduling cycles in which the local end does not demodulate fax data continuously, and counting the second number of scheduling cycles in which the remote end does not have T.38 packets continuously; It is judged whether the first number and the second number both reach the threshold, and if both reach the threshold, switch from the T.38 fax channel to the voice channel.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, device and system for switching from a facsimile channel to a voice channel. Background technique [0002] In the next generation network, the facsimile service is a kind of voice service based on VoIP (Voice over Internet Protocol, VoIP) technology, and is transmitted through the data stream implemented by the gateway device. At present, there are mainly two ways in the industry to realize the fax service through the gateway: VBD (Voice Band Data, voice band data) and T.38 way. [0003] VBD is the transparent transmission mode, through the G.711 voice codec, the fax data is transmitted as ordinary voice. The advantage of this method is that it is practical and simple, and it does not need to care about the specific content of the fax data, and only performs voice codec processing. The disadvantage is that it is greatly affected by the IP network. When the network co...

Claims

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Application Information

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IPC IPC(8): H04N1/32H04L29/06
CPCH04M2201/52H04M2203/2066H04M2203/657H04N1/32614H04L12/66H04M11/00H04N1/327
Inventor 王一李晨浩黄亚玲
Owner ZTE CORP