We have historically always disabled DNS client in CUCM as we used it from version 4 up to current version 10. Now I have installed Presence server adn disable DNS client also. But I have realized, how it can communicate with external companies in trust if DNS client is turned off?
I would like to enable DNS client for CUCM and Presence... Is only way to enable it, backup CUCM Published+Subcriber and Presence, reinstall cisco unified OS and enable DNS client in setup, then restore all systems from backup?
You must have hit a bug or something unique to that product. Enabling DNS isn't a big deal on most products as long as you have the records for the cluster nodes correct. You need both an A and a single PTR record (be careful to delete any duplicates) that correctly resolve the server's FQDN. Screw that bit up and you'll likely experience database replication issues; otherwise, you should be fine.
PS- If you're going to do federation, don't forget to think about what domain the IM&P cluster is in. You'll want it to be your public DNS namespace and not a fictional internal namespace. Example: cisco.com instead of cisco.local. This is because XMPP typically uses TLS and the handshake will fail if the FQDN contacted from the outside doesn't match the details of the certificate.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
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Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...