Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series IP Phones508Parameter Permitted Values DefaultNonePhone User Interface:NoneIntercomIntercom allows establishing an audio conversation directly. The IP phone can answer intercomcalls automatically. This feature depends on support from a SIP server.Intercom is a useful feature in office environments to quickly connect with an operator orsecretary. Users can press an intercom key to automatically initiate an outgoing intercom callwith a remote extension.Intercom can be also used to monitor a specific user for status changes on IP phones. Forexample, you can configure an intercom key on a supervisor’s phone to monitor the IP phoneuser status (busy or idle). When the monitored user places a call, a busy indicator on thesupervisor’s phone indicates that the user’s phone is in use. When the monitored user is idle, thesupervisor can press the intercom key to automatically connect with a preconfigured targetextension for outgoing intercom calls. When the monitored user receives an incoming call, thesupervisor can press the intercom key to pick up the call directly. To pick up the call, you have toconfigure the directed call pickup code in advance. You can configure the directed call pickupcode when configuring an intercom key. IP phones support this feature using aSUBSCRIBE/NOTIFY mechanism as specified in RFC 3265. This feature depends on support froma SIP server.Line key/Expansion Module Key LED (configured as an intercom key)LED Status DescriptionSolid green The monitored user is idle.Fast-flashing red (200ms) The monitored user receives an incoming call.Solid red The monitored user is dialing.The monitored user is talking.Off The monitored user does not exist.
