do you have a default gateway set for your obion number?
Dialing 7, 10 or 11 digits directly uses a gateway.
Dialing 2*+number directs the call to the Obi designated in the number 2 speed dial list. That Obi has to have single stage dialing setup on it, with your Obion number in the COT, to take the call from your Obion number.