I have a customer that has Unity 4.05 Unified messaging and we are moving them Unity 7.x with a new server.
In the past we would upgrade the old server, use dirt to migrate over to the new platform.
I now see COBRAS and GSM have options to migrate users between version of Unity.
Is there a preference between using DIRT vs Cobras/GSM?
There are approx 2,000 users.