We have equipment in 5 NA locations and over 500 phones, so management is not looking to move to anything else at this time.
Why would management be involved? IT should be like "we can save money, improve systems" and that's the end of it. Why would management have any say other than verifying cost savings and such? The bigger the network, the more money there is to be saved, right?
He's in the same situation as me. The hardware is already in place. Moving to FreePBX would likely require purchasing all new phones, or moving users to softphones on their computers, which would require purchasing headsets most likely.
In either case, there would be a substantial hardware outlay likely if they changed.
But they are looking at significant outlay to keep using what they have. They have to invest specifically in a VMware solution instead of what meets the needs of the business, they have to pay to keep the Avaya running and they have to take on the risks of using a solution from a non-viable or marginally viable vendor. That's all real costs that they are facing to NOT switch.
I'm not saying you're wrong - but 500 phones, even Yealink aren't cheap, not to mention the training to the staff, the IT time, etc.
If it really boils down to it, they can just leave it on the server it's currently on, and change nothing else about that one server. We assume there is already a backup solution in place - so that shouldn't be that bad to maintain.
Then the business can plan for this change over down the road.
We also have a few call centers, which accounts for a significant amount of revenue. So, aside from all the hardware expenses to rip and replace, we would need to reprogram all the routing (and the ability needs to be there, in whatever new system gets installed) along with retraining the call center staff. It would probably take an amazing ROI, before management would even begin to consider approving a project like this. I do appreciate the comments regarding the on-going expenses to manage Avaya.