M2 Supported Codecs
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G.711 alaw
G.711 ulaw
G.722
G.723.1 (passthrough only)
G.726
G.729 (Annex A only)
GSM
Speex (32kHz using 20ms ptime)
OPUS
G.711 alaw
G.711 ulaw
G.722
G.723.1 (passthrough only)
G.726
G.729 (Annex A only)
GSM
Speex (32kHz using 20ms ptime)
OPUS