I was surprised at the process to change the ringtones on my obi1062. Have played with this quite a bit and have found the following.
The only setting in the obiexpertconfig that makes a difference is silence. (Voice Services->SPx Service->X_DefaultRing). All the other options (1-10) make no difference.
On the phone itself under the settings menu there is a ringtones setting which allows you to change the ringtone file played. By default it plays what it calls Office A.wav. I can use that setting to change the ring tone but the choices are quite limited and were too "cell phone" ish for my liking. The manual explains a way of sending ringtone files to the machine but it seems like quite a bit of hassle.
I'm documenting this as I wasn't able to find this information in the manual or on google (maybe I missed it?). Anyway, if others have corrections to what I wrote, please share. If anyone knows of a simpler way to get a new ringtone on the phone, please respond with that information.