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I have been tasked to migrate one of my customer's IP telephony network from 192.168.11.0/24 IP addressing scheme to 172.27.72.0/23. My customer has deployed Cisco Call Manager and Cisco Unity Express. I just want to know what all things I should take care of, so this transition happens smoothly? I do not have much experience in handling such migrations, any help is highly appreciated.

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    We need a lot more to help you. A network diagram and detailed description of how everything is connected. Also what type of network equipment is used and the configurations.
    – user36472
    Commented Mar 25, 2018 at 10:55
  • The main things I'd also ask are how many phones are involved, whether they are remotely managed, and what amount of downtime is considered acceptable.
    – jonathanjo
    Commented Mar 25, 2018 at 11:21
  • The customer wants me to do the reconfiguration only for one site.They have 87 IP phones and all are managed by the CUCM at their branch. I have one full day to reconfigure things.They also have a couple of SIP trunks, if I change the IP address of the CUCM how the tunks will be affected?
    – Abdul Tayyeb
    Commented Mar 25, 2018 at 13:21
  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you could provide and accept your own answer.
    – Ron Maupin ♦
    Commented Apr 1, 2018 at 23:10

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One thing that I have learnt the hard way is migrating CUCM and UNITY. Make sure you change the ip address on the web interface by going to SYSYTEM > SERVER and changing the ip address to the new one (eg.172.27.72.1)

Then you need console access to them. If they are running virtually then this is a benefit. Login to each server an issue these commands:

set network gateway *<gateway>* set network ip eth0 *<ip>* *<subnet mask>*

The server will then reboot and have the new IP you set. But make sure you change in on the WEB gui first to avoid being locked out!

I do not know about the SIP trunks that you have setup and how they have been configured.

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  • No problem, let me know if you need more help
    – AvidPontoon
    Commented Mar 27, 2018 at 19:36
  • Does changing the IP address of the CUCM and Unity invalidates the existing License? Do I need to get a new license from Cisco after the change?
    – Abdul Tayyeb
    Commented Mar 28, 2018 at 9:42
  • No, this shouldn't change anything with Cisco UCM
    – AvidPontoon
    Commented Mar 28, 2018 at 10:48

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