[Asterisk-Dev] SIP : transfer and display update

[Kevin P. Fleming]

Olle E. Johansson wrote:
>>As part of our COLP extension (#ifdef COLP) we need an asynchroneous
>>solution, not only for SIP.
> 
> Please educate me: What is COLP ?

COnnected Line Presentation

There is also COLR

COnnected Line Restriction

This was stuff I was working on a few months ago, but got sidetracked.

In response to the OP... I will be posting the generic event system soon 
(honest!), which will be able to be the basis for these asynchronous 
changes that need to be sent to external devices.