1)Embedded 4E1, can be expanded to 100 E1 maxima; 2)Maxima support 192 FXS/FXO (128 calls at same time); 3)PABX function; Feature:·Signaling support: SS7, DSSI, Q.SIG, R2, V5.2;·Protocol support: SIP, H.323, RTP/RTCP;·Codecs: G.711, G.711, G.723, G.729, G.726, G.726, G.728, GSM, AMR, T.38;·Switching volume: 4096*4096;·Clock accuracy: stratum 3 Clock;·Clock source: E1, internal;·Echo cancellation: ...