... including SIP protocol, Frequency domain echo cancellation and iLBC codec;Compatible with asterisk,3CX,Yate based on IP PBX system ... enable it to interoperate with SIP-based application servers, media servers and large variety of IADs.ManagementLike other WSS series ... 24 Channels), 2T1 (48 Channels), 4T1 (96 Channels)· Voice ProcessingVoice Codec: G.711, G.729A, G.723.1, GSM, iLBCEcho Cancellation ...