With Extension mobiltiy, I have set the credentials so that users need to change the pin when they first log in. This works up to the point where you try and put the new pin in and it says Authentication error.
this is on CUCM 7.0 by the way
Tommer is right, there is a very recent thread treating the same concern
IP Phone Services for End Users: Changing PIN from an IP phone in CUCM 6.1(3)
on roadmap, so right now there is no way to do it directly on the phone.
if this helps, please rate
I dont think they can change their PIN via the IP Phone. It has to be done via the CCMUSER page.