... with its plug-in module structure, combined with E1, FXO and FXS access port, can flexible ... ;·Clock accuracy: stratum 3 Clock;·Clock source: E1, internal;·Echo cancellation:G.168, 128ms Network echo ... for dialing, busy call back, wake-Up Service, Hot Line Service and so on· Call restriction with different ... Voice codec· 64 Conference call· Embedded 4 E1, E1 can be expanded with plug in moudule.· Maxima ...