... 4E1 120 DS0 voice processing with any codec (G.711u/aLaw, G.723.1,G.729,GSM,iLBC,T.38)Ideal PSTN termination for ... full load voice processing to support CODEC (G.711, G.729A, G.723,iLBC,GSM), echo cancellation (G.168), DTMF relay (RFC2833), and fax ... Channels), 4T1 (96 Channels)· Voice ProcessingVoice Codec: G.711, G.729A, G.723.1, GSM, iLBCEcho Cancellation: G.168, tail length: 8/16/32/64 ...