Ran Across this post on Poly com website that also describes pretty much the exact same thing we are seeing. Does anyone have a fix for this? I don't see a 5.x firmware for the adtran/polycom 500 series phones. 4.1.6 - Delay when using Hold or Transfer on VVX - Polycom Community
Todd, the 5.X firmware can be downloaded directly from Polycom's website. Thanks
Jay