I have an odd problem with the MGCP gateway at one of the sites in our recent 12 site deployment. Every few weeks we will get a report that inbound PSTN calls to this location ring once and then the caller gets dialtone (all inbound PSTN calls come in over loop-start FXO ports). We have discovered that if you go into CallManager and look at the gateway endpoints, they have taken on the IP address of the local WAN public address. If we do a "no mgcp" then a "mgcp" on the router, the address reverts to the ip address of the voice vlan, and all is good again, at least for a few weeks. This seems to be the only site that this is happening with. Our LAN runs over MPLS, which terminates at the router in a WIC-1DSU-T1. My personal feeling is that this may be a IOS bug, but I have not been able to find anything on Bugtracker or TAC Case Collection. I even had a TAC case open on it once, and all the engineer had me do was rebind MGCP to the voice vlan interface, which did not solve the problem long-term. I'm just hoping some of you out there may have seen this before and might have a solution. I have attached a copy of the router's sh version and sh run. You can see the WAN address under the serial0/0/0 interface. Can anyone shed some light? This is driving me insane. Thanks.