Background, in my HQ, I have CM 4.1.(3)sr4d with connection to 3845 routers as my PSTN gateway. My remote offices are connected with MPLS links. I have users in my HQ that establish Meet Me Conferences and users from the remote offices join in, and the conference for the remote user works fine for 20 minutes and then the remote user reports the conference call "fades way and become inaudible" The user can hang up and call back and everything is fine. But after 20 minutes, the issue returns. Users that are located in the HQ with the CM don't have this issue. Remote users in the other offices never have had this problem with a one to one call. This only happens when the Meet Me lines are in use. Ideas?