... U-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,GSM ... ,ARM,ILBC; Features:·Echo Cancellation: G.168 ... equipment can have 2 independent VoIP modules;·Each Module contains:-1~4 E1;-128 G.711 Channels;-64 G.723, G.726, G.729 Channels;-32 ...