-We have a main office with satellite offices.
-The main office has a Nortel switch, with a PRI (coming in from verizon).
-The main office has VPN tunnels to the satelite offices (ASA 5505)
-Every office has Avaya 4610 ip phones.
-The remote sites have Avaya gateways.
The call quality over the tunnel is just horrendous. Cutting out, static, jitter. Our phones are in a different network than our data, so we did some class-map policies to prioritize the network (see below).
One of our satellite offices:
match access-list voip-traffic
match dscp ef