You don't need any mgcp specific commands under the voice port, you just need "application mgcpapp" under your dial peer, and even that should automatically be configured by the callmanager since you are using ccm-manager config server. Check your gateway configuration page, you need to make sure you have configured all the voice ports on the gateway config page in call manager. After setting the subunit type for the module in question click the endpoint identifier (ie.e 2/0 1/0, etc) and it will let you set the protocols, signalling, etc. Make sure you choose T1 CAS at that point. If all else fails, change the voice card listing in callmanager to none, update and add again. You may want to try just removing the ccm-manager config option and manually configuring the router, you will just have to set your voice port settings manually on the router (any special attenuation, echo cancel, etc) rather than through call manager. This could be yet another Cisco bug too, I have 12.3(11) running on a couple routers, but they are currently at PRI. Hope this was of some help.
