I had issues from day one with the Phone Manager sound/voice quality. We also connect remote users via vpn so that they can connect to the IPO. We had issues with the echo sound and also a lot of choppy voice quality. From what I have found out by posting those issues here and working with a company that implements Avaya systems, they all point to once the voice packets go across the Internet it is hard to troubleshoot. It also depends on the internet speed that the laptop is connected to and the amount of traffic on the network that the laptop is connecting to via vpn.
I had better luck with the Avaya 4610 hard phone with the VPN client downloaded to it.
Not sure if this helps!
Rob
Doc, we better back up. We don't have enough road to get up to 88.