We have a CM 9.1 cluster and Unity Connection 9.1. We have multiple sites and deployed with 4 digit extension using the last 4 digit of DID. e.g. XXX-289-5220 becomes 5220 for the user's phone and unity voicemail.
Each site have their own PT and CSS in Call Manager and Unity Connection but there is only 1 phone system integration with the Unity Connection.
We have been lucky and not yet have overlapping extension in Unity Connection.
To avoid overlapping, we are considering deploying new sites with 7 digit extension. e.g. XXX-289-6270 becomes 2896270 for the phone extension
This would give us a mix of 4 digit and 7 digit extension on the Unity Connection. Anyone have experience with this type of setup? If not, would anyone see what kind of issue this would cause?
This is not a good design, and over the years i have remediated quite a few deployments where it was setup this way due to many reasons, mainly sooner or later you will run into overlaps and managing it via CSS/PT is one thing, UCNX is another, and more importantly there are applications such as CTI/JTAPI based applications (UCCX, UCCE, CER, CUEAC, etc) which are not partition aware and don't work well with it.
My suggestion would be to change it to either +e164 dial plan, uniform dial plan (i.e. 7 digits) or variable length flat dial plan (X digits between sites, 4 digits within a site) where the defined DN is the full X digits long and all DNs are in a common partition.
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