Sorry for the delay. All packets loss are over my local LAN. Oddly enough, I just upgraded to ShoreTel6 last night and so far no packets loss...yet.
My ShoreTel vendor has been advising me that separation of data and phone line will solve my issues.
I have 3 ShoreGear-120/24 Switches.

For those that are thinking of upgrading to ShoreTel6, don't do it yet. I'm experiencing a lot of little glitches since the upgrade last night.