1) Setup correctly DNS server
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It is recommended to setup DNS1 and DNS2 as well as a backup. You can use globally known Google DNS server 8.8.8.8
2) Setup Domain name in SIP registration
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As described on the picture, setup domain name of SIP proxy, to which you want to register the gateway
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For correct SIP registration continue with settings of Caller ID or Username and Password if SIP proxy requires authentication
3) SIP Registrar
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For registration to SIP proxy domain name, you need to fill 0.0.0.0 as an IP address for SIP Registrar
