Method for communicating audio data in a packet switched...

Details Method for communicating audio data in a packet switched... Method for communicating audio data in a packet switched...

2006-01-31

2006-01-31

Chin, Wellington (Department: 2664)

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

C370S389000

Reexamination Certificate

active

06993012

ABSTRACT:
A method of audio communication between a first telephony client located behind a network address translation (NAT) server and a remote second telephony client is disclosed. A calibration datagram is sent from the first telephony client to the second telephony client on a user datagram protocol (UDP) channel identified for sending audio data. The second telephony client extracts the source address and port number to identify a reverse UDP channel for sending audio data to the first telephony client.

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Alan B. Johnston, SIP, Understanding the Session Initiation Protocol, 2001, pp. 0-52.

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