Optimize VoIP - USG Flex

Ecari
Ecari Posts: 2  Freshman Member
First Comment
in Security

I have a problem with a customer equipped with a USG Flex 200 who makes phone calls over Wifi. It doesn't work on iphones, no problem on Android.
Is there an option to optimize VoIP flows from a USG Flex 200 (in particular the LLDP option which I can't find).

Thanks for your feedback

All Replies

  • Zyxel_Melen
    Zyxel_Melen Posts: 2,305  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    Hi @Ecari,

    I would like to confirm something with you first:

    1. Do the iPhone users apply the VoWiFi function from their service provider?
    2. Does the iPhone enable the VoWiFi function?

    Zyxel Melen

    Engage in the Community, become an MVP, and win exclusive prizes!


  • Ecari
    Ecari Posts: 2  Freshman Member
    First Comment
    edited July 31

    Yes, of course! I've activated LLDP on the access points, but I can't find an equivalent option on the Zywall USG Flex 200.

  • Zyxel_Melen
    Zyxel_Melen Posts: 2,305  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
    edited August 26

    Hi @Ecari,

    Could you help check your log that if there are any blocking logs first? We assume there might be a security service/policy that blocks VoWiFi from iPhones. You can filter the iPhone's WiFi IP address to check.

    Update:

    Please check the security policy to see if it allows UDP 500, UDP 4500 for Wi-Fi calling/VoWiFi, and UDP 16384 - 49327 for RTP.

    Zyxel Melen

    Engage in the Community, become an MVP, and win exclusive prizes!


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