RTP redirection using a handheld device with Minisip
This report presents several different techniques for diverting RTP streams when using a handheld mobile device. This device is running a version of Minisip as the SIP user agent.
An introduction to the SIP protocol is given to provide some background to the reader prior to focusing upon the main goal: redirecting RTP streams. A set of requirements are defined and an RTP media transfer mode is chosen based upon these requirements. The requirements are derived from a study of a Linux cellular phone’s mobile device features and capabilities. Minisip was ported to this platform and a series of tests conducted to evaluate the design decisions made. These tests show that the best method of redirecting RTP media streams is third party call control (3PCC).
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