Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2007-03-22
2009-11-17
Trinh, Tan (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S519000, C455S503000, C370S401000, C370S395500
Reexamination Certificate
active
07620413
ABSTRACT:
A method of implementing push-to-talk (PTT) communication between network phone clients utilizing Session Initiation Protocol (SIP) Voice over Internet Protocol (VoIP) and multicast RTP, includes pushing a “Talk” button on a talking client to generate a PTT invitation message (via SIP INVITE or MESSAGE), transmitting the PTT invitation message from the talking client to a SIP server, transmitting the PTT invitation message from the SIP server to a PTT server, consulting a group list stored on the PTT server to identify a plurality of receiving clients associated with the talking client, sending the PTT invitation message from the PTT server to the plurality of receiving clients, the PTT server receiving acknowledgement of the PTT invitation message from the plurality of receiving clients. The PTT server arbitrates the token-requests of the clients, translates a unicast-to-multicast RTP of token-request and talk-burst packets, and then broadcasts to all clients.
REFERENCES:
patent: 2003/0235184 (2003-12-01), Dorenbosch et al.
patent: 2006/0116149 (2006-06-01), Dunn et al.
patent: 2007/0214217 (2007-09-01), Ueno et al.
patent: 2008/0101340 (2008-05-01), Bernath
Hsu Winston
Trinh Tan
Unication Co., Ltd.
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