Zywall USG 110 - VoIP - BLF not working


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  • Spiro
    Spiro Posts: 8
    First Comment

    The NOTIFY seems to be coming back on a different port 3953 ? is this relevant ?

  • Zyxel_Stanley
    Zyxel_Stanley Posts: 1,299
    100 Answers 1000 Comments Friend Collector Sixth Anniversary
     Zyxel Employee

    Hi @Spiro

    For check the symptom more details, you can send the WAN and LAN packets by private message to me.

  • Alcindo
    Alcindo Posts: 4
    First Comment Fifth Anniversary
     Freshman Member

    Hi Stanley,

    Has this issue been resolved?

    Can you share a how-to?

    This is a very common issue.

    We work-around it very often by asking to change from SIP over UDP to SIP over TCP.

    But I have not had any luck in getting WAN and LAN traces before and after to find the root cause.

    Best regards,


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