... signaling, 128 channels VoIP concurrency and SIP protocol.NC-MG800-104,an intergration of a smart switch, uphold the concept ... T Q.931, Q.921) -V5.2(ITU-T G.964, G.965)·VoIP protocol support: -SIP(RFC3261, RFC3362(T.38 ... -Code: G.711µ-Law and A-Law, G.711 Appendix 1, G.723.1 and G.723.1 Annex A, G.729 Annex A ... and Annex B, G.726;·Echo Cancellation: G.168 128 ...