I'm using Elastix v1.0 and trying to use VTWhite as a carrier. I can make outgoing calls to some external numbers just fine. Other external numbers, I only get one-way audio. The other person can hear me, but I can't hear them (I can't even hear it ringing) on my Polycom headset. This is Elastix 1.0, SIP to VTWhite, Polycom phones, on a T1 connection, with all ports opened up and a static IP address. Ideas? Does anyone use VTWhite and have a trunk/outgoing configuration they could post?