QBZappy ,
Thanks!
But the thing is, that I have SP2 as primary phone line, but also I have rule to send all outgoing calls to the US through SP1. Just outbound rule {(1xxxxxxxxxx):sp1} and Obi is working this way.I have no problem with incoming or outgoing calls.
I have tried to put just phone number 1xxx xxx xxxx in forwarding phone number field and that did not work either.
I also tried conditional call forwarding, but same story the moment condition kicks in, incoming call gets disconnected.