I have Obi 100 w Google Voice as SP1, Callcentric as SP2. After May 15 I plan to forward GV calls to free Callcentric DID, spoof my GV number for outgoing calls on Callcentric. Will this work? Should I switch to Callcentric as SP1? I already forward incoming GV calls to the Callcentric DID but there is no ring, only a record that there was an incoming call.