USG FLEX H Series - Why I cannot use VoWiFi?
Zyxel_Melen
Posts: 2,750 
Zyxel Employee
Zyxel Employee
in Other Topics
Please check:
- Do you block these service ports in the security policy? UDP 500, UDP 4500, and UDP 16384 - 49327. If yes, please allow these ports and check if VoWiFi is available.
- Do you enable ALG service? If yes, please disable it and check if VoWiFi is available.
- Is there any blocking log?
If you still have a problem, please ask in the security category, and our support team will assist you.
Zyxel Melen
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