Under DID Numbers --> Manage DID(s) --> (select the UK DID) --> Edit Selection-All at once,
SIP/IAX --> (select the main account or sub-account for the registered account for your main DID (setup on SP2). Also, make sure the same POP is selected.
I'm using OBI110. SP1 is GV and SP2 has voip.ms configured. I'm able to make international calls on voip.ms ok.
I also have E911 set up with voip.ms - and have a different local number configured for it (can't remember why I have a different local number than my GV number but I do) - but when I use there 911 test number - it's says it's configured right.
I ordered a UK DID number so family in UK could call - but when they do - my home phone doesn't ring. The DID is showing up ok on the voip.ms site - is there some additional config on Obi I need to do? It already has SP2 configured with voip.ms and I'm able to make international calls ok.