We had to test this very thing when we changed timezone and SMTP settings and other than the forced reboot of our Pub, there was no outage (no phones are registered to our Pub) and we were able to get our licenses re-hosted within a few days without issue.
From: firstname.lastname@example.org [email@example.com] on behalf of Erick [firstname.lastname@example.org]
Sent: Tuesday, June 12, 2012 5:33 AM
To: Jason Aarons (AM)
Cc: cisco-voip (email@example.com)
Subject: Re: [cisco-voip] CallManager 8.5 in vmWare license mac change primary ntp
There is supposed to be a 30 day grace period. I've never tested it though.
On Jun 12, 2012, at 7:23 AM, "Jason Aarons (AM)" <firstname.lastname@example.org<mailto:email@example.com>> wrote:
Customer running CallManager 8.5 with 8 nodes. Need to change publisher prmary ntp server invalidating license mac (show status).
Once I delete the old primary ntp server, while the other nodes continue to process calls while I call tac to license re-hosted? I don’t want a outage.
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