Implementation method of the high-speed fax signaling flow supported by the gateway control protocol

Abstract

Disclosed is a method for achieving a signaling process of a high speed fax supported by gateway control protocols, wherein MGCP protocol mutual information and control fax operation are adopted at soft switch and the gateway, and both T.38 and VBD fax mode can be compatible at one time, in which T.38 mode is preferably selected and then VBD fax mode; two gateways of the soft switch control fax transmission terminal and receiving terminal confer on fax modes and fax media channel information; voice communication state is switched back or call is released directly without switching back to voice communication state according to working state of switching set by soft switch, after the fax is finished. The gateway in accordance with the present invention adopts MGCP protocols, such as IAD. Said method can dynamically assign IP addresses, port numbers and coding modes of fax medias and can achieve mutual fax of different plants and different operators when being carried out over the whole net; concision, clarity, high efficiency and reliability of signaling process adds little mutual information to a voice calling and can support crossing-soft switch fax services, with excellent feasibility of implementation.

Description

technical field [0001] The invention relates to a method for solving the reliability problem of real-time transmission of Group 3 (G3) fax data on the IP Internet, to be precise, a method for realizing the signaling flow of high-speed fax supported by a gateway control protocol, belonging to The technical field of softswitch network. Background technique [0002] At present, there are mainly two encoding technologies for fax data transmitted on the IP Internet. One is to encode the fax data with the voice coding G.711 algorithm and then transmit it on the IP Internet. This method is called VBD (Voice Band Data); the other is to use the coding technology-T.38 procedure specially designed for the real-time transmission of fax data on the IP Internet. Reliable transmission of fax data over IP Internet. [0003] For the fax service, the T.38 method is more adaptable to the bearer environment of the IP Internet than the VBD method, so it can achieve better fax quality. However...

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Problems solved by technology

[0008] In view of this, the purpose of the present invention is to provide a method for realizing the signaling process of the high-speed fax supported by the gateway control protocol, which is used to solve the current problems in the fax service: T.38 and VBD two fax encoding methods cannot Compatible in business, and when using softswit

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