Set up Sip Voip Phone system


I have a list of Ports to open on my USG60 Firewall. Should I have the NAT set to virtual server or 1:1 NAT and should I have NAT Loopback switched off? 


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  • Zyxel_Melen
    Zyxel_Melen Posts: 1,617  Zyxel Employee
    First Anniversary 10 Comments Friend Collector First Answer
    Hi @Signguy121,

    Welcome to Zyxel community!

    May you share your topology?
    I would like to know where is your SIP phone and SIP server first.

    Zyxel Melen

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