I am trying to set up a Polycom phone as a SIP station on an ESI phone system. When I make a phone call from the video phone to my desk phone, the call connects, I see the correct caller ID on the phone, but there is no audio on either phone. I cannot make an outbound call on the Polycom phone. I don’t think it’s grabbing an outside line to use (we have line group 9 set up).