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What are the recommended settings for Ascom VOIP Phones

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TitleWhat are the recommended settings for Ascom VOIP Phones
Question
What are the recommended settings for Ascom VOIP Phones
Environment
  • IdentiFi Wireless
  • Ascom VOIP Phones
Answer
1. Set Radio-2 Channel Mode to 'G/N' rather than 'B/G/N' under AP Tab > APs > Click AP in question > Radio 2 Tab > Radio Mode dropdown
2. Disable ADDBA and MPDU under AP Tab > APs > Click AP in question > Radio 2 Tab > Advanced Button > Select option 'Disable' for Aggregate MPDU and ADDBA Support > Click Close > Click Save
3. Disable U-APSD under VNS > WLAN Services > WLAN Service in question > QOS Tab > uncheck U-APSD > Click Save
4. Enable Flexible Client Access under VNS > WLAN Services > WLAN Service in question > QOS Tab > check Flexible Client Access  > Click Save
5. If WPA key is used, WPA encryption should be AES Only and version 2 under VNS Tab > WLAN Services > WLAN service in question > Privacy Tab
6. On physical Ascom phone, enable Gratuitous ARP
7. Due to some previous roaming issues, ensure firmware 09.21.04.xx or later is applied to AP's
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