Due to ever expanding business we are on the verge of running out of Directory Numbers on our CUCM. The plan is to move from 4 digit extension to 5 digit extension.
Below is a brief outline of our setup
5 X CUCM Servers
We have total 4 sites.
What we plan to do at the moment is to prepend the existing extension numbers with one digit, and the starting digit will be determined by Directory Number type and Location.
All CTI-RP will change from 4XXX to 14XXX
All Phones in Site 1 will change from 2XXX to 42XXX
All Phones in Site 2 will change from 2XXX to 52XXX
All CTI-Ports will change from 9XXX to 29XXX
We understand that IP IVR related ports will hev to be deleated and then recreated.
for all other extentions we will have to do a DB upddate.
If any of you have gone through the same, please let us know of tips and considerations for the big move.
Please check the following post with similar query
It should provide some more guidance.