Situation I tried to register my MGCP gateway to my CUCM, but everytime I did a “show ccm-manager”, it displays the following: Troubleshooting I first thought about an issue about DNS on CUCM. I remembered that, during the CUCM installation, I put CUCM somewhere. So I went to every corner of CUCM admin pages, where I could find the “CUCM” keyword. I changed some settings in Entreprise Parameters. I even tried to change the hostname under the CUCM CLI mode: Then, I examined what’s happening at the router level, with “debug mgcp events”. I noticed this line: