I'm new to the forum having just recently dumped my landline and switched to an Obi100 and Callcentric. I've noticed that my phones now have a double ring to them. Does this come from the ATA or the service provider? How can this be modified? Can I setup distinctive ring tones? Thanks.
The signal that rings your phone is generated by your Obi. The cadence is programmable and the Obi contains several preset ones.
If you are using two Service Providers you can assign a different cadence to each. However you only mention Callcentric so I assume you have one SP. AFAIK it is not possible to have the Obi use a different ring cadence depending on the caller's number.
However the Obi will pass the CallerID to the phone and some phones can match incoming numbers to ones in their phonebook which have been assigned distinctive rings.
Go to Voice Services > SP1 Service >
X-RingProfile A
X-DefaultRing 1
This should give you a standard ring pattern.