[cisco-voip] Changing CUCM Servers to use IP instead of DNS

[Stephen Welsh]

Hi Ryan,

I have to disagree, changing from Hostname <-> IP Address will mean the subject name of the certificates (Callmanager.Pem & TVS.Pem) on the relevant nodes will change, so those certificates will be regenerated.

As long as you follow this document you should be okay:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/install/8_6_1/ipchange/ipchg861.html

However, we do typically find during a change like this a small percentage of devices don't update their ITL Files correctly, so you may end up with 1-2% of endpoints with problems and not know it...

UnifiedFX (http://www.unifiedfx.com) just announces a brand new version of PhoneView (Version 3.5) that allows you to detect, report and fix any ITL Issues, we just published this video showing the new features, very relevant to Eric's project, or anyone upgrading/changing CUCM for that matter:

http://www.youtube.com/watch?v=-2FH-_rzdnE

Thanks

Stephen Welsh

On 25 Jul 2013, at 16:47, "Ryan Ratliff (rratliff)" <rratliff at cisco.com<mailto:rratliff at cisco.com>>
 wrote:

It won't impact ITLs since they are based on the actual server info, nothing in the database.

The biggest issue with doing this comes when changing the IP address of a server.  if the value in System->Server doesn't match or cannot resolve to the IP of the server then the database won't start, and all kinds of bad things happen.

-Ryan

On Jul 25, 2013, at 10:32 AM, Eric Pedersen <PedersenE at bennettjones.com<mailto:PedersenE at bennettjones.com>> wrote:

I'm considering changing the CUCM Servers to be configured as IP addresses instead of host names to remove the dependency of phones on DNS.  Is this a safe thing to do? I couldn't find much information about this on the Cisco site.  I'm particularly concerned about ITL issues after change.

Thanks,
Eric


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