Edwin
I have neither none experience on this but I do know we did some tests with partners/customers based on different VoIP vendors and that worked well. AFAIK most of issues could be with latency between users and VoIP systems so of course, the closest you are, the better it is.
I would say it worth a test with a PoC.
HTH
Emmanuel
Emmanuel BERNARD
Lead Solution Engineer | VMware Cloud | EMEA
Please mark "Helpful" or "Correct Answer" if applies. Appreciate it.