Portfreischaltung für WLAN Call notwendig?

9 years ago

Seitdem ich WLAN Call aktiviert habe, gibt es manche WLAN's, in denen sich das iPhone per WLAN Call registriert, an anderen nie. 

Welche Voraussetzungen sind erforderlich? Welche TCP-/UDP-Ports müssen z.B. freigeschaltet sein, damit WLAN Call funktioniert?

21022

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