... codec (G.711u/aLaw, G.723.1,G.729,GSM,iLBC,T.38)Ideal PSTN termination for IP phones, VoIP gateway ... including SIP protocol, Frequency domain echo cancellation and iLBC codec;Compatible with asterisk,3CX,Yate based on IP PBX system;High PerformanceVoice ... processing to support CODEC (G.711, G.729A, G.723,iLBC,GSM), echo cancellation (G.168), DTMF relay (RFC2833), and fax ...