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IP fax system based on T.38 and method for enhancing switching-on rate

A technology of IP fax and connection rate, applied in the field of communication, which can solve the problems of timer timeout, delay, packet loss, etc.

Inactive Publication Date: 2009-06-17
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the T.38 relay fax, it is possible to encounter the loss, delay and out-of-order of the T.38 message sent by the gateway of the other party. At the same time, the own fax machine will set some timers. The modulation signal of the other party's fax machine, these timers will time out, and the fax machine will be disconnected

Method used

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  • IP fax system based on T.38 and method for enhancing switching-on rate
  • IP fax system based on T.38 and method for enhancing switching-on rate
  • IP fax system based on T.38 and method for enhancing switching-on rate

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Embodiment Construction

[0026] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0027] Please refer to figure 1 Shown is a structural diagram of a T.38-based IP fax system, including a local fax machine, a local media gateway connected to the local fax machine, a peer fax machine, and a peer media gateway connected to the peer fax machine; the local media gateway and the peer media Gateway network connection. The local media gateway and the other party’s media gateway are equipped with a T.30 state machine. The state machine changes its state according to the T.30 signaling demodulated on the TDM side and parsed from the T.38 message on the network side. For each The state must be able to indicate which T.30 event is waiting to occur in this state under the normal fax process, and the state to be transitioned to after receiving a T.30 event; this event is defined by a two-tuple: 1, T.30 message The valu...

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PUM

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Abstract

The invention discloses an IP facsimile system based on T.38 and a method for increasing the call completing rate thereof, wherein the system comprises a local fax machine, a local media gateway connected with the local fax machine, a counterpart fax machine, and a counterpart media gateway connected with the counterpart fax machine, wherein the local media gateway is connected with a counterpart media gateway network, the local media gateway is used to modulate signals for the local fax machine instead of the counterpart fax machine when waiting a network side T.30 event, and conducts the T.30 signaling cheat, and then transmits to the modulation of T.30 signal while waiting the arrival or normal restoration of a counterpart message. The invention avoids the linkage interruption caused by the overtime of a timer inside the fax machine in the T.38 relay facsimile posting, makes the fax machine without disconnecting in the T.30 signaling agreement process, and increases the call completing success rate of the T.38 relay fax.

Description

【Technical field】 [0001] The invention relates to the communication field, in particular to a method for improving the facsimile connection rate in the relay process of a T.38-based IP facsimile system. 【Background technique】 [0002] With the development of the Internet, the T.38 protocol for real-time fax relay on the IP network has also been more and more used. The T.38 gateway will demodulate the modulated signal sent by the connected fax machine, encapsulate the demodulated data into a message specified by the T.38 protocol, and send it to the other gateway through the IP network. The peer gateway extracts the data from the message and modulates it to the fax machine it is connected to. [0003] The T.30 signaling exchange between the third type of fax machines is used for negotiation and handshake between the two parties. In the T.38 fax environment, the media gateway modulates and demodulates T.30 signaling in v.21 mode on the TDM side to interact with the fax machi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L12/66
Inventor 舒畅
Owner ZTE CORP
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