My frustrating week and a half trying to get the phones to register comes to an end
Guys, I highly recommend you read the "Special Issues with CUCM and IP Phones" in the Introduction Hardware section of the lab manual. For me, the second bullet point "Removing the Initial Trust List" did it for me. I was doing great reading Jeremy's Official Certification Guide until I ran into CUCM, so I decided to put off my CCNA Voice studies until this lab manual came out. On the second go around with CUCME using the lab manual rather than following Jeremy's book, I had a problem with the phones registering because they were previously registered with CUCM. The phones that were having a problem were the 7961 and 7941 phones.