Supported audio codecs:
- G.711 (ulaw and alaw)
- AMR (NB)
- silk (sampling rates 8, 12, 16, 24 kHz)
- slin (sampling rates 8, 12, 16, 24, 32, 44, 48, 96, 192 kHz)
- speex (sampling rates 8, 32 kHz)
All codecs support translation on fly.
For G.729 encoding is performed only to G.729a format.
Decoding is supported both for G.729a and G.729b.
In case if both legs have been created with G.729, frames are passed transparently, without translation G.729a <-> G.729b.