Facsimile system and facsimile disconnecting method

Abstract

The invention discloses facsimile system and method. The facsimile system comprises a first MGW (Media Gateway), an MGC (Media Gateway Controller) and a second MGW, wherein after a sending-end facsimile apparatus finishes sending facsimile data, the first MGW receives an in-band disconnect message (DCN) from the sending-end facsimile apparatus and responds to the received DCN message to send a facsimile end event (NOTIFY); the MGC is configured with a timing device and used for receiving the NOTIFY sent by the first MGW and responds to the received NOTIFY to start the timing device; the second MGW receives the DCN from the first MGW and back sends the NOTIFY to the MGC; if the MGC receives the NOTIFY back sent by the second MGW during the timing duration of the timing device, the MGC respectively sends an out-off-band disconnect command to a receiving-end facsimile apparatus and the second MGW; and if the MGC does not receive the NOTIFY back sent by the second MGW when the timing period of the timing device runs out, the MGC respectively sends the out-off-band disconnect command to the second MGW and the receiving-end facsimile apparatus. The facsimile system and method can be used for solving the problems of abnormal facsimile transmission and the like which are caused by early disconnection.

Description

technical field [0001] The technical solution disclosed in this application relates to a fax system and method, more specifically to a media gateway controller-based fax system and a fax disconnection method. Background technique [0002] In the existing network fax service implemented based on the media gateway, when the fax service ends or an abnormality occurs, disconnection processing is usually required to release currently occupied network resources. [0003] FIG. 1 and FIG. 2 respectively show a flow chart and a sequence diagram of disconnection processing based on an existing media gateway controller (MGC) system. As shown in the figure, in step S01, after sending the fax data, the fax machine 100 at the sending end sends an end-of-fax (EOP) message to the media gateway (MGW) 200 at the sending end. The MGW 200 at the sending end sends the received EOP message to the MGW 400 at the receiving end. Subsequently, the receiving end MGW 400 sends the received EOP messag...

AI Technical Summary

Problems solved by technology

[0005] At this time, there may be two abnormal situations. One is that the receiving end facsimile machine 500 has received the EOP and sent the MCF message (fax data transmission has been completed), but has received the DISCONNECT message without receiving the DCN, so the receiving end facsimile Machine 500 will think that the fax is abnormal, but in fact the received fax page is complete

Second, when the receiving end MGW400 receives the EOP, if the transmission of the fax data has not been completed, the EOP is not sent to the receiving fax machine 500, but the message DISCONNECT arrives at the receiving fax machine 500 in advance, so the problem of incomplete reception of the fax page occurs

However, the receiving end MGW400 may receive the disconnection message SUB before receiving the DCN; or the receiving end MGW400 receives the SUB message before sending the DCN to the receiving end fax machine 500

In this way, the MGW400 at the receiving end will not send the DCN to the fax machine at the receiving end, so that the fax machine at the receiving end will not receive the DCN and think that the fax ends abnormally

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