Unable to register the gateway in CUCM as MGCP... just does'nt register...

Check the following: 

1) Check if a domain name is configured, if it is then either remove it or suffix it after the router hostname (example; instead of mentioning only the hostname as "R1" while registering the gateway in CUCM, register it as "R1.xyz.com" or whatever your domain name is in the router" 

2) shut and bring up mgcp process by issue a "no mgcp" "mgcp" 

3) issue the show ccc-manager command to see the status of the gateway in the router... if it's registered and active you might want to restart the "RIS Data Collector" service in cucm, it does sometimes happen that the cucm does not reflect the values in it's informix database... 

4) make sure the following commands are present in the router for mgcp.... 

ccm-manager redundant-host 177.1.10.11 
ccm-manager mgcp 
! 
mgcp 
mgcp call-agent 177.1.10.1 service-type mgcp version 0.1 
mgcp dtmf-relay voip codec all mode out-of-band 
! 
mgcp profile default 

5) hang the router from the wall and punch it !@!#!#@#@


Config Snippet:

mgcp 
mgcp call-agent 177.1.10.20 
mgcp bind control source lo 0 
mgcp bind media source lo 0 
mgcp dtmf-relay voice codec all mode out-of-band 
ccm-manager redundant host 177.1.10.10 
ccm-manager mgcp 
ccm-manager switchback immediate