... SIP protocol.Flexible configuration of one to four E1 / T1Guarantee 4E1 120 DS0 voice processing with ... any codec (G.711u/aLaw, G.723.1,G.729,GSM,iLBC,T.38)Ideal PSTN ... and collect statistics remotely.SpecificationKey Features· Configuration: Configurable E1 or T1 Interface by WEB1E1 (30 Channels), 2E1 ... ProcessingVoice Codec: G.711, G.729A, G.723.1, GSM, iLBCEcho Cancellation: G.168, tail length: 8 ...