If you’ve been following the development of Asterisk carefully, you’ve seen that some changes have been made with respect to Asterisk’s codec support.
Beginning with the 1.6.2 release of Asterisk, pass-through support for Polycom’s Siren 7 (G.722.1) and Siren 14 (G.722.1C) was added. Both of these codecs offer improvements upon the more commonly known and used G.722 codec. G.722 is a 7kHz codec, sampled at 16kHz, that, for Asterisk, operates at 64kbit/s. Siren 7 (G.722.1) offers the same frequency response (7kHz) and sampling rate (16kHz) of regular G.722, but it’s done in half the bandwidth – 32kbit/s, as opposed to … Continued