We have a remote office of about 10 users tying back to a corporate office. We have a CTX100 at the remote office and CTX670 at the corporate connected over the internet with T-1 connections at both offices. The quality over the connection is often bad.

We have experimented with a toshiba IPT1020 single VoIP phone at the remote office and the quality is much better. Is there something fundamentally different about the communication used by the two?