Re: 51 APs on voice vlan with 110 802.11 Handsets and 300 VoIP h
Let me answer your question with another question - RTP streams from your phones would be unicast, unless you were using applications like multicast paging or multicast MOH. Are there any of these applications present?
For seamless roaming, you will want the APs to be located on the same VLAN and use the same SSIDs and addressing scheme across your wireless infrastructure. You could separate it from your voice VLAN for segmentation purposes, so long as DHCP services and QoS is present on your APs and distribution switches on the wireless VLAN.
A quick estimation of the traffic involved is 7.04Mb/s if every phone was being used simultaneously with a G.711 codec. Bandwidth would generally not be an issue, but latency and jitter are your priorities. Depending on how your wireless network is laid out, you shouldn't have more then 8-12 phones associated to a single AP or jitter, latency and retransmissions will become an issue.