I have a 7940 Running on CM 8.6(2). when it is in the Default Device Pool it works fine. If I change the DP to the locations Specific DP I get a "Registration Rejected" message on the phone. The DP is the only thing I change. Other phones are working fine in that DP. Does anyone have any idea what could be causing that?
Did you figure out the issue you were having and why the phone was rejected when you change Device Pool? I am having the same issue on CUCM 10.5 and a 7940 ip phone. If you could update on your resolution I'd really appreciate it.