I understand that a voice over wireless deployment needs its own VLAN but the question is what is the best practice size of the single voice vlan? Once exceded what is the best practice subnet size for AP Groups?
You will get many different answers here:) So in my experience, a /24 is good, you keep the broadcast domain small. I have also had clients with a /16 and no issues, but not with voice since that would be a lot of wireless phones in general. I think the largest subnet I had wireless voice, my client was using a /23 subnet.
AP Groups woul be the same in a way, you need to define how large of a subnet you need. With the 188.8.131.52, they added a new feature called interface groups that allows you to bundle interfaces together. So you can bundle 2+ /24 if you wanted to.
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