asterisk users - Mar 2005 - Modify CallerID (on SIP phone) during call

Is it possible to modify the caller id on the phone during a call (session) ?
If not does anybody know with which SIP request this could be handled ?
 
I'm know investigating RFC3311 which seems to offer an answer but if
somebody already has an answer ...
 
Michael

Michael Devenijn wrote:
> Is it possible to modify the caller id on the phone during a call (session)
?
> If not does anybody know with which SIP request this could be handled ?
Do you mean what is displayed on the phone's display? If so, yes, with 
some phones this is possible, by performing a re-INVITE or UPDATE with 
the new caller information included. However, Asterisk currently has no 
way to request that to happen, it only knows how to send 
re-INVITE/UPDATE to change the media path.