USG FLEX H Series - Which service ports should I open for VoWiFi?
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Zyxel_Melen
Posts: 3,550 
Zyxel Employee
Zyxel Employee
in Other Topics
Please allow UDP 500, and UDP 4500 for Wi-Fi calling/VoWiFi. If you are using iPhone, please also allow UDP 16384 - 49327 for RTP.
Zyxel Melen
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