For best performance of latency-sensitive applications over wireless, such as voice, plan to keep RF channel utilization under 50%. This is not a hard-and-fast rule, but a best practice for most networks supporting data and voice.
Check out these resources for more info:
Cisco Voice over WiFi Troubleshooting Checklist
Wireless LAN Professionals Podcast #10 - Designing for Voice
-Andrew
Thanks for the articles Andy, very useful.
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