That's good for CMS Supervisor, but you've still got to change the IP address on the actual CMS server. Other considerations are the IP addresses for AUDIX, MapD, CLAN boards, MedPro boards, etc. Also, are the sub-net masks and default gateways changing, as well? I'd follow cyberon's advice and have Avaya or an outsource company do the work for you.
Susan
Under certain circumstances, profanity provides a relief denied even to prayer. - Mark Twain