Review Board 1.7.16

Modularized RTP stack support

Review Request #209 - Created March 25, 2009 and submitted

Joshua Colp
This patch provides a common API (known as the RTP engine API) so that RTP stacks can be easily plugged into Asterisk. Functionality wise this patch should be equal to the current capabilities of our in-core RTP stack. The API is documented in the rtp_engine.h header file and the in-core RTP stack has been broken out into a module called res_rtp_asterisk.
I've tested using the most complex channel driver that uses the RTP stack, chan_sip. I've confirmed calls of various scenarios work but would like further testing with additional channel drivers that I am unable to test.
Review request changed
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