I have cisco 7940's and 7960's with a 2821 router and CUCM 7.1.2. I was wondering where do the phones get the profile from in SRST mode? more specific, how do I change line appearences in SRST
The phones use the line appearance which it has when registered to CM. The phone has memory of this, so when it fails to SRST mode, it will use the same provisioning. No provisioning is sent from SRST to the phone in regards to DNs/line appearances. The phone actually sends the information to SRST.
The phone knows where to fallback to SRST for based on the SRST reference which is defined in CM for the device pool, and it is placed in the phone config file.