A customer of mine wants to connect an analog door intercom as an analog extension on the UC540.
He wants all internal extensions to ring when the door-bell is pressed (easy - analog extension dials to a blast-group) but he wants the extensions to have a different ringtone for the phones when the call arrives from the door-bell rather then a normal call from any other internal extension or an inbound call from the PSTN. Makes sense, because that way people can differentiate between a regular incoming call and someone at the door and react differently.
Please advise if this is possible somehow.
PS - BTW, could this also be taken to a more generic level, meaning, can a user define different ringtones for different callers (internal or external) which today, based on caller-id, is possible and easily configured on almost any mobile phone in the world. Users expect the same feature when they're in the office.