Hi,you could use a codec list where u can specify the order of codecs that will be negotiated with the remote peer.

Does the register message go through NAT in the 827?What is the network topology?Amos

If the first issue ( learning about the tunnel endpoint through the tunnel) is not it then just check for integrity of the tunnel by pinging about 1000 pings with the maximum mtu of the tunnel.

Mike,You can definitly do what you described. actually i am a network engineer for an isp that uses exactly that service from a carrier. there are at least 10 more isps on that share this mpls core to reach that carriers dsl customers.There are few w...