Reliable call progress indication for SIP

Details Reliable call progress indication for SIP Reliable call progress indication for SIP

2003-03-10

2008-10-14

Gauthier, Gerald (Department: 2614)

Telephonic communications

Special services

Call diversion

C370S356000, C370S401000, C379S900000, C709S249000

Reexamination Certificate

active

07436946

ABSTRACT:
A method for communicating with a device in an unreliable messaging environment is provided. The method comprises: repeatedly sending an invite signal to the device, wherein the invite signal is sent until a ringing response is received from the device; receiving a ringing response from the device in response to the device receiving the invite signal; and ceasing to send the invite signal to the device when the ringing response is received from the device.

REFERENCES:
patent: 6735621 (2004-05-01), Yoakum et al.
patent: 6937597 (2005-08-01), Rosenberg et al.
Rosenberg et al., “Reliability of Provisional Responses in the Session Initiation Protocol (SIP)” The Internet Society, 14 pages, (2002).
Rantapuska, “SIP Call Security in an Open IP Network”, Helsinki University of Technology, Telecommunications Software and Multimedia Laboratory, May 28, 2003, 14 pages.

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