I just had a outgoing call drop after about 20 minutes. I checked my router and there were no dropped packets and the NAT entry was still there for the call.

I noticed that it was using the media gateway at 66.62.140.38. When I ping that machine, I get a very high latency.. Most of the times its around 110ms. But sometimes its very high.. If I do a traceroute most of the hops are fine except for the last one.

ping -t 66.62.140.38
Pinging 66.62.140.38 with 32 bytes of data:
Reply from 66.62.140.38: bytes=32 time=437ms TTL=48
Reply from 66.62.140.38: bytes=32 time=438ms TTL=48
Reply from 66.62.140.38: bytes=32 time=430ms TTL=48
Reply from 66.62.140.38: bytes=32 time=440ms TTL=48
Reply from 66.62.140.38: bytes=32 time=437ms TTL=48

Ping statistics for 66.62.140.38:
Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 430ms, Maximum = 440ms, Average = 436ms