7821 not registering after changing to hostname from ip

[blackswans]

Hi,

We are using 12.5 version ccm and moved from ip to hostname in the server menu. After that some of the 7821 phones didnt registered some of them are registered. Thats why I returned to ip. What can be the problem?

Thanks.

[silvervoip]

Hey,

You should be careful and make sure you meet all requirements before changing IP, DNS or something similar. It is not simple as it looks. Please click on this URL and find exactly what you need;

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/install/12_5_1/ipchange/cucm_b_change-ip-address-hostname-1251.html

If you still have questions marks, please let me know, I will be more than happy to help.

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[Vaijanath Sonvane]

Hi,

Have you followed the procedure mentioned in below document:

https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/211393-Change-CUCM-Server-Definition-from-IP-Ad.html