QuoteThe "roll over" or "fail over" is what I mean by automatic switch.
Yes, I did understand what you meant.
In my opinion, no "fail over" will work unless your OBi110 can tell that sp2 has failed. I still cannot see how your OBi110 can tell that callwithus has failed. So long as it does not know that callwithus has failed, then it will continue to try to send calls to sp2.
To prove the trunk group works, you could simply uncheck:
Voice Services > SP2 Service > Enable
This will show how it would work if you could make the OBi110 see that callwithus had failed.
I have to log out for today. Please have a read through all the ideas in this thread and try anything that seems sensible. I will be back tomorrow for an update