Enter Amy: The Sting of Rejection: Part 2
So once you’ve checked the gateway configuration and everything looks kosher, you can move onto checking the CUCM piece of the puzzle. There are (at least) two common errors when it comes to MGCP port configuration. One, and by far the most common, is to get the device name wrong.
Easiest way to check this is to do a #show ccm-manager on the gateway and see what is listed as the device name in the output . Go ahead and copy and paste this into CUCM to be sure you have it correct. Your device name will look like mygateway@mysitename.com if the domain name is set. This needs to be precise in CUCM or the gateway won’t register – it would be like calling your new girlfriend by your old girlfriend’s name. Hostile doesn’t begin to describe it.
Great Analogy.

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