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

Accepted Solution

  • Zyxel_Melen
    Zyxel_Melen Posts: 3,306  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 2024 Answer ✓

    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


All Replies

  • Zyxel_Melen
    Zyxel_Melen Posts: 3,306  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


  • Ecari
    Ecari Posts: 2  Freshman Member
    First Comment
    edited July 2024

    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: 3,306  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 2024 Answer ✓

    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


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