Asterisk – VoIP Codecs

Below are a diffrent types of Codecs that Asterisk can handle

Codec Speed Simultaneous Calls over T1 (1.5 Mbps) Notes
u-law 64 Kbps 24 US Standard
a-law 64 Kbps 24 European standard
G.723.1 5.3/6.3 Kbps 289/243
G.726 16/24/32/40 Kbps 96/64/48/38
G.729 8 Kbps 192 Requires license
GSM 13 Kbps 118
iLBC 15 Kbps 102
LPC-10 2.5 Kbps 614
Speex 2.15 – 44.2 Kbps 714 – 34 Open Codec

With higher compression you can squeeze more calls through the same connection pipe, however, the savings of bandwidth does not come without a cost. The hight the compression the lower the voice quality of the call.


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