The idea is that : a customer call, I automaticly open the page of his accout in my CRM.
On the many SIP softphone on ubuntu (ekiga, linphone,...), the only one that i could make do that is twinkle. It has a very convenient "script_incoming_call" option that does exactly what i need. The problem is that the program is not maintained, so that the gui doesn't work on ubuntu 14.04 (something about qt3).
Linphone seams pretty customable, but i had no luck with it.