Another thing that I needed to do, when I reverted back to manual configuration, was setting the phone type to 7912 in the ephone section.
ephone 3
no multicast-moh
mac-address 0011.xxxx.xxxx
type 7912
button 1:3
Getting Started
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: