I try the following:
CMPhone is easy to configure.
All you need are the username, password and server ip
I set it at SP2 of the obi110.
I use obion to dial in. Second stage dial out via sp2, quality is very good indeed.
I know but what is the corresponding entry in the OBi110 since most of members does not know. If possible, step by step to show how it is configured in your OBi110.