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Example of a downstream PBX
A LANCOM 1722 VoIP is switched between the ISDN outside line and the
existing ISDN PBX. In the PBX, automatic outside line access is enabled, the
call router settings for the LANCOM 1722 VoIP decide whether or not a "0"
must be dialed for outside line access for the connected ISDN and SIP sub-
scribers.
SIP subscribers
Downstream ISDN PBX:
Automatic outside line access enabled
ISDN subscribers
If the LANCOM VoIP Router in this constellation is not available, for
example, due to a power outage, the ISDN connection for the down-
stream ISDN PBX is automatically "bridged" to the external ISDN con-
nection (when life-line support is enabled). For a LANCOM VoIP
Router without automatic outside line access, the ISDN subscribers
should not dial a "0" before the number while the life-line support is
active.
Example of an upstream PBX
A LANCOM VoIP Router is connected to an ISDN PBX extension line. In the
LANCOM VoIP Router, automatic outside line access is enabled, the settings
LANCOM 1722 VoIP – LANCOM 1724 VoIP
Chapter 1: Introduction
LANCOM 1722 VoIP
Internet
ISDN
31
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