Implementation method of high-speed fax signaling flow supported by the media capability negotiation

Abstract

Disclosed is a method for achieving a signaling process of a high speed facsimile supported by medium ability, wherein H.248 protocol mutual information and control fax businesses are adapted between a soft switch and a gateway to be compatible with both T.38 and VBD fax modes at the same time, in which T.38 mode is selected preferably, then the VBD mode; the soft switch control fax sending terminal consults with both gateways of the receiving terminal about fax modes and fax medium channel information; after the fax is finished, according to working states of switch mechanism set by the soft switch, the switch is turned to voice talking state or a call is released directly without turning the switch to the voice talking state. Said effective medium ability consultation method in accordance with the present invention is capable of assigning dynamicly IP address of fax medium, port number and coding manner, and is capable of achieving fax interconnection between different plants and different operators when being carried out over the whole net. The signaling process defined by the present invention is compact, legible, effective and reliable, gives less additional mutual information to a voice call, can support a fax business crossing a soft switch, and exhibits excellent feasibility of implementation.

Description

technical field [0001] The present invention relates to a method for solving the reliability problem of real-time transmission of Group 3 (G3) fax data on the IP Internet. 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, the digital signal processor (DSP) required by T.38 has special performance requirements, and the performance consumpti...

AI Technical Summary

Problems solved by technology

[0008] In view of this, the purpose of the present invention is to provide a method for realizing the signaling flow of high-speed fax supported by media capability negotiation, which is used to solve the current problem in the fax service: T.38 and VBD two fax encoding methods cannot Compatible in business, and when using softswitch to control fax, there are many problems: excessive signaling interaction with gateway, low efficiency, poor implementation, and inability to realize cross-softswitch fax; thus, providing users with a clear A method for realizing an efficient fax signaling process that is simple, interoperable, and interoperable across the entire network

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