Innovaphone IP1200, Руководство администратора

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page 24 innovaphone IP DECT
4.1.2.2 Configuration/IP/NAT
The telephone is able to connect IP terminals from the network with a non-public
address
to the public Internet. For this, NAT ( N etwork A ddress T ranslation) is
necessary. NAT serves as the router and requires a configuration of the PPPoE
protocol.
The necessary parameters for this configuration can be set here:
Private
Networks Through specification of a private network, the device can con-
trol the media relay function.
The media relay function is
needed, for example, to solve NAT problems.
In the case of a call, the PBX and the RELAY then auto-
matically use the media relay function, if they determine
that a VoIP call is running between the private and the
public network.
Here,
the private network configuration
is always referred to, to find out whether the Calling
Party Number and the Called Party Number are located
in the same IP network.
If nothing is entered here, it is assumed that both par-
ties are located in the public network. The media relay
function is not used and RTP packets are exchanged
directly between the end points. If a private network is
specified, RTP packets are not passed directly between
the terminals, but are routed between the internal and
external network via the device.
Enable NAT A checked check box enables NAT in general. This function is
only required if the IP telephone is also a DSL router.
Default for-
ward desti-
nation If all incoming data packets are to be forwarded to a particular
IP address as standard, the destination IP address must be
entered here.
Port-speci-
fic forwar-
ding To be able to address several internal destinations, different
port number numbers are assigned to IP addresses of the
internal network here.