RTP port does not come into play for phones that are on the same network as the server... right? I had 1 phone today that tested fine on local loopback, but most of the time would not receive audio. Upon changing the local RTP port to a different number, it started working fine. It was on 5004 which is what all of my internal phones are on. Why would I have to change the local RTP port? The Extension is set to Local Lan.