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After upgrading from 9.15.06 to 9.21.02 all Ascom phones are now in message only mode.

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TitleAfter upgrading from 9.15.06 to 9.21.02 all Ascom phones are now in message only mode.
Symptoms
After upgrading to 9.21.02, Ascom phones will not connect to the WLAN-Service.
Environment
  • IdentiFi
  • Firmware 9.21.02
  • All Controllers
  • Ascom
  • VoIP
  • U-APSD
Cause
When a client sends a re-association during roaming, the target AP will not set the power save settings. So AP will use legacy but client will use U-APSD. This mismatch caused the connection problem.
Resolution
Issue resolved in firmware 9.21.04 or higher. 
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