Lancom LC-1823 Manuals page 19

LANCOM VoIP Routers: PBX Functionalities
Chapter 3: Configuring the VoIP functions
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You then activate your ISDN or analog connection for voice
communications, so that you can use this connection to telephone to the
public telephone network.
With an ISDN connection, you can select which of the available ISDN
interfaces is to be used for external telephone calls.
For an analog connection, you can define the internal telephone number
(or hunt group) that incoming calls are to be forwarded to.
Depending on the model, the wizard may ask you to set the protocol
required by the ISDN interfaces for external telephony. Set the protocol for
each interface to 'Auto (TE only)'.
If you use an ISDN connection to telephone via the public telephone
network, you can give every external telephone number (MSN or DDI) a
corresponding internal telephone number. Use the allocation in your
dialing plan to help you with this. At the same time, if applicable, you
select the ISDN interface over which these external telephone numbers
receive calls. If multiple ISDN interfaces to the exchange line have been
configured as point-to-point connections, then you also have to select
each DDI that corresponds to these interfaces.
In case you wish to use an MSN or DDI as a central telephone number
for a group of subscribers (hunt group), then with the help of your
dialing plan you can enter the internal telephone number for the
group here, e.g. '10' to reach the subscribers '11', '12', '13', etc.