I meant to say no then I remembered what I'm currently working on.
So, yes it is possible but it is complex and involves CTI. You need a CTI Port / CTI Routing Point that listens to DN 1111. When a call comes in, the call is dropped and the application pushes information to the calling phone (it can be anything, you can send the phone any data that is allowed for IP phone services).
If that sounds like something you'd like to do, have a look at the CallerInfoServer application in the IP Phone SDK (it's written in JAVA, using JTAPI). It pushes an XML screen to a phone when it gets an incoming call. Then install the JTAPI Client and have a look at the JTrace application on how to catch more JTAPI events and register a CTI Port. For CTI Routepoints, look at the JTAPI interest mailing list at sun.com - the archive for February 05 includes useful examples.
