The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 22, 2011
Filed:
Jul. 25, 2007
Ruihua LI, Shenzhen, CN;
Wei Chen, Shenzhen, CN;
Huawei Technologies Co., Ltd., Shenzhen, CN;
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.