Review Board 1.7.16

use webrtc iILBC code for codec_iLBC

Review Request #1964 - Created June 4, 2012 and submitted

Tzafrir Cohen
The license of the RFC3951 iLBC codec implementation does not seem clear to me and therefore I'm not sure I can use it.

Google's implementation from is slightly different. Latly, however, someone has been working on adapting it for use with the interface provided by the RFC3951 implementation:

This patch uses that new libilbc to build codec_ilbc. As in the case of gsm, it's also possible to use the internal implementation, if one exists.
Builds. A simple ilbc call works. runs on a server provided by Digium, Inc. and uses bandwidth donated to the open source Asterisk community by API Digital Communications in Huntsville, AL USA.
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