Support G.711,G.729 etc codec voice intercom；

Support SIP 2.0(RFC3261) and related RFC protocol;

Unlock function (swipe or communication) ;

Visitor leave message；

Calling indoor extension for two-way conversation；

Software upgrading on line；

WEB remote management of Terminal malfunction or status.

Support G.711,G.729 etc codec voice intercom； Support SIP 2.0(RFC3261) and related RFC protocol; Unlock function (swipe or communication) ; Visitor leave message； Calling indoor extension for two-way conversation； Software upgrading on line； WEB remote management of Terminal malfunction or status.