We have 13 sites and (2) CCM clusters.
Each site is either 4 digit, 5 digit or 6 digit extensions, with some overlap between the 2 clusters.
This overlap forces me to prefix digits when dialing between clusters.
I have a project to switch to 6-digit dialing worldwide.
Are there any best practices out there?
I was thinking of something like a [2 digit site code] + [last 4 of DID]
site1 = 10XXXX
site2 = 11XXXX
site3 = 12XXXX
...
site13 = 22XXXX