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Method for realizing V.34 high-speed facsimile through T.38 protocol

A technology for high-speed fax and protocol implementation, applied in the field of fax, it can solve the problem of inability to use T.38 protocol high-speed fax, and achieve the effect of reducing requirements and reliable transmission

Inactive Publication Date: 2008-01-02
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Therefore, in order to solve the problem that the T.38 protocol cannot be used to realize high-speed fax in the prior art, the present invention proposes a method for realizing V.34 high-speed fax through the T.38 protocol

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  • Method for realizing V.34 high-speed facsimile through T.38 protocol
  • Method for realizing V.34 high-speed facsimile through T.38 protocol

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Embodiment Construction

[0027] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Before the description, some terms involved in the present invention are described as follows. For more detailed description, refer to the content of the V.8 protocol and the T.30 protocol.

[0028] Response signal ANSam, which is an amplitude modulation signal, sent by a data circuit termination device supporting V.8 capability;

[0029] The CM signal, that is, the call menu, is sent by the data circuit termination device that supports V.8 capabilities, and provides the callers with the choice of modulation mode, protocol, and non-standard capabilities;

[0030] CNG single tone is 1100HZ single tone, used for fax, indicating the calling data circuit termination equipment;

[0031] The DIS signal is a digitally marked signal, which is provided to both calling parties for negotiation of modem mode, protocol, and fax capability;

[0032] The CI ...

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Abstract

The method of realizing high speed V.34 facsimile by means of T.38 protocol includes: 1) the called terminal in high speed V.34 facsimile mode, after being switched to communication line, sends V21 Flag signal and sets the V.8 capacity flag place to 1 as the DIS signal; 2) the medium gateway controller sends T.38 facsimile switching command to the gateways of both the calling party and the called party according to the V21 Flag signal the called terminal sent; and 3) the gateway in the called terminal sets the V.8 capacity flag place in the DIS signal as 0 and transmits to the gateway of the called terminal, so as to establish the T.38 mode facsimile calling. The present invention realizes the reliable transmission of high speed facsimile service in NGN network.

Description

field of invention [0001] The present invention relates to facsimile technology, in particular to a high-speed facsimile technology under the T.38 protocol (the transmission procedure and protocol of common facsimile on IP network). Background technique [0002] V.34 fax is a fax method that uses V.34 MODEM modulation and demodulation technology to realize high-speed message transmission according to the transmission procedures defined by the T.30 protocol. Due to the message transmission rate of V.34 fax (33.6K ) is greater than the message transmission rate of ordinary fax (up to 14.4K), so V.34 fax is also called V.34 high-speed fax. [0003] V.34 high-speed fax has the following features: [0004] 1. Error Correction (ECM) must be used [0005] 2. Support 33.6K packet transmission rate [0006] 3. V.34 high-speed fax terminals belong to the G3 category of terminals [0007] 4. Start the fax according to the start procedure specified in V.8 [0008] Under the NGN (Ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/50H04L12/66H04N1/00H04L12/24H04L12/26H04L29/06
Inventor 蒋晓黎
Owner HUAWEI TECH CO LTD