Hi, I am able to connect our nokia phones as SIP devices to our CUCM6.1 and they receive incoming calls and are able to make calls via the telephony service with no problems. However, after a while it stops working. I look under SIP settings and it says 'registration rejected'. If I copy the SIP profile on the phone, and create a new one then it starts working again. Nothing is being changed on the CallManager side...Is there any way to troubleshoot this in a better way, or does anyone have a fix to my problem?!?