[asterisk-users] The plain old PBX functionality

[Kevin Larsen]

> back in the old analog telephony days there was "digital" PBX-es and
> digital "system" phonesets. This phonesets have had many individual
> illuminatable buttons connected with extensions. The PBX can show on
> the buttons if some extension is ringing (blinks) or busy (constant
> light), and the user can transfer the call with one touch (pressing
> one of this button).
> 
> I search this functionality in Asterisk. What versions, and what
> extension functions (or other settings), and what VoIP phones can do
> this?

Asterisk has had this functionality for a long time. The terms you want to 
search for are BLF (Busy Lamp Field) and Subscribe. I imagine that most 
sip phones have the necessary features to do BLF. I know the Polycom 
phones I use certainly do. The Digium branded phones do as well.
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