# Cascades — request to Vertical (Richard Turner): set Poly handsets to 5 GHz-only - **Date:** 2026-06-19 - **To:** Richard Turner (Vertical, VoIP vendor) - **From:** Howard Enos, Arizona Computer Guru - **Why:** After the RF optimization, the residual dropped-call/audio issues are handsets stuck on saturated 2.4 GHz despite strong 5 GHz-capable signal (band-selection problem, not coverage). Controller-side band steering is on but not holding the Poly fleet on 5 GHz -> need a phone-side 5 GHz band lock. Evidence: handsets on 2.4 at -50 to -60 dBm showing 36-96% retransmission vs <10% for handsets on 5 GHz. Poly OUI 48:25:67. --- To: Richard Turner Subject: Cascades — set Poly handsets to 5 GHz-only Richard, We've finished optimizing the WiFi at Cascades. 5 GHz is now clean (2-3% utilization); 2.4 GHz is saturated at 84-91% and isn't usable for voice at this site. The remaining dropped-call/audio issues are all handsets that are sitting on 2.4 GHz despite a strong 5 GHz-capable signal — some at -50 dBm showing 36-96% packet retransmission, versus under 10% for the phones on 5 GHz. It's a band-selection problem, not coverage. Please set the Poly WiFi handsets at Cascades to 5 GHz only (disable the 2.4 GHz band in provisioning) so they can't fall back to 2.4. Let me know when it's pushed and I'll confirm they re-home to 5 GHz from our side. Thanks, Howard Enos Arizona Computer Guru