Prosody S v3 offers support for the following voice codecs:-
G.711, G.723.1/.1a, G.726, G.728, G.729A, G.729B, G.729AB, iLBC, GSM-FR, GSM-EFR, MS-GSM, EVRC, iSAC, G.722, G.722.1, G.722.2 (a.k.a. AMR-WB), SPEEX and Skype SiLK.
The list of supported codecs is expanding. Please contact Aculab if the codec you require is not listed.