I have some users in remote places using Mitel VOIP phones connecting through a MBG back here in the office. They complain about quality of the calls with sound fading or just getting disconnected all together. Since I'm a newbie when coming to VOIP, I was wondering if any experts out there have some input. I know this can be related to many things including their home Internet service. That would be my first choice but they swear their Internet connection is fine. We don't have these issues here in the office.
Any help or insight on what could cause these issues, would be greatly appreciated.