Method for ensuring reliable transmission of DCN signal by a...

Details Method for ensuring reliable transmission of DCN signal by a... Method for ensuring reliable transmission of DCN signal by a...

2011-01-18

2011-01-18

Grant, II, Jerome (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Communication

C358S407000, C358S405000, C379S100090

Reexamination Certificate

active

07872773

ABSTRACT:
A method for ensuring reliable transmission of a DCN signal by a gateway is disclosed. When acting as a sending gateway, the gateway packs a DCN signal detected into an IFP packet and sends the IFP packet to the IP side, then, reports a fax end event to a Soft Switch after a designated delay period; and the Soft Switch issues a State Switching Command for switching the two gateways back to voice state after receiving the fax end event. When acting as a receiving gateway, the gateway modulates a DCN signal detected and sends the modulated DCN signal to a receiving facsimile machine; if a switching command issued by a Soft Switch is received during sending the DCN signal, the gateway delays the switching; if the gateway has not received a switching command after the DCN data is sent, the gateway initiatively reports a fax end event.

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