2N Omega series - VoIP manual v1.4 - Manual (Page 80)

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4.13.3. DNS proxy
Used for caching DNS records in case Ethernet module works as a
UMTS/ADSL router. The DSN proxy can receive DNS queries from the local
network and forward them to an Internet Domain Name Server. If the DNS Proxy is
disabled, the gateway forwards all requests to the servers assigned by the
UMTS/ADSL provider.
The Ethernet module can use the DNSs from the Network settings or you can
forward the DNS queries to specified servers.