Snom 320 - Manual (Page 83)

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DHCP: Turn the use of DHCP on or off with this option. For
further information, see our white paper regarding DHCP on our website.
IP address: You can change the IP address of the device through
this setting. This parameter is mandatory in order to enable the Ethernet
connection.
Netmask: Change the netmask for the device.
Phone name: Change the Hostname of the phone here. If
this parameter is available, it is used for identifying the device in SIP
signalling.
IP Gateway: This setting shows the IP address of the default IP
gateway (NOT the VoIP gateway). It is the address to which the packets
are routed when the desired packet address is not in the current subnet.
Setting up this parameter is mandatory in order to reach an external
network.
DNS
Domain: Specify the DNS domain for your phone here.
DNS Server 1: Specify the IP address of the DNS server for
your network here. This parameter is extremely important for a properly
functioning phone, so please make sure it is set up correctly.
For troubleshooting, check the DNS cache page so see whether
the phone is able to resolve DNS addresses!
DNS Server 2: Specify the IP address of a backup DNS server for
your network here.
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