... SS7, ISDN PRI V5.2 signaling and SIP protocol; Advantage:1. Modular design (Two modules, Each module supports maxima 4E1 ... 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.168 128 ... can have 2 independent VoIP modules;·Each Module contains:-1~4 E1;-128 G.711 Channels;-64 G.723, G.726, ...