Lancom LC-1823, Руководства

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LANCOM VoIP Routers: PBX Functionalities
Chapter 6: Extended functions
45
EN

The procedure of call forwarding at the exchange is not visible at the
LANCOM Business-VoIP-Router—consequently the forwarding of
calls is not displayed in LANmonitor.
6.2 Life-line support for ISDN telephones
Life-line support allows LANCOM Business-VoIP-Routers to continue to
provide telephony to any connected ISDN telephones, even if the LANCOM
device is unconfigured and/or in case of power outage. To ensure that this
function works, the telephone numbers are mapped twice between the ISDN
NTBA and the terminal equipment.
At the transition from the ISDN NTBA to the LANCOM Business-VoIP-
Router, the ISDN mapping table for the ISDN line defines the translation
between external MSNs from the ISDN network and internal telephone
numbers. For example, an incoming call for the MSN '0123456789' is
converted into the internal telephone number '11'.
At the transition from the LANCOM Business-VoIP-Router to the ISDN
telephone, the ISDN user table defines the translation between the
internal telephone number and the internal MSN. The incoming call
directed to '11' is converted back into '0123456789'. For this reason, the
ISDN telephone needs this "MSN" programmed into it as its internal MSN
in order for it to react to this telephone number.
If the LANCOM Business-VoIP-Router is not available as a telephone
exchange (device is unconfigured or there is a power outage) then the the
ISDN interfaces provide a "bridge" between the internal devices and the
external connection.

A requirement for this function is the correct configuration of the ISDN
interfaces and of the DIP switches on the underside of the device—
these are the standard ex-factory settings.
ISDN
users
ISDN
mapping
MSN
<->
Int. tel.
MSN:
0123456789
MSN:
0123456789
Int. tel. no.
<->
MSN
0123456789 0123456789 11