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LANCOM 1722 VoIP – LANCOM 1723 VoIP – LANCOM 1724 VoIP – LANCOM 1823 VoIP
Chapter 1: Introduction
24
EN
The precise number of users and lines available varies between mod-
els and software options.
1.4.3 VoIP characteristics of the LANCOM VoIP Routers
Multiple ISDN/analog interfaces
The ISDN/analog interfaces of the LANCOM VoIP Router can be switched as
internal or external connections and, depending on the model, offer up to
eight parallel voice channels. This allows, for example, an existing PBX to be
additionally equipped with SIP and connected to an upstream VoIP PBX. Sub-
scribers can simultaneously make calls via ISDN and analog telephones, SIP
equipment, or softphones to other telephone subscribers, both internally and
externally. The transition between SIP and ISDN/analog is automatic and
invisible to the user.
Telephone even during a power cut
With life-line support and power relay to the internal ISDN port, it remains
possible to telephone over the conventional telephone network even in case
of a power outage. ISDN backup, load balancing and VRRP in combination
with Ethernet ports as WAN interfaces provide SIP connections with redun-
dancy and high reliability. If a SIP remote station should fail, switching auto-
matically reverts to the conventional telephone network. This ensures that
telephony is just as reliable as ever, even with VoIP.
Point-to-multipoint and point-to-point connections with ISDN
For ISDN, LANCOM VoIP Routers support point-to-multipoint and
point-to-point connections:
Point-to-multipoint connection (point-to-multipoint): Up to 8 ISDN termi-
nal devices can be connected to this type of connection. Terminal equip-
ment can include ISDN telephones and ISDN PBXs, which can be used for
connecting yet more equipment. As an alternative, a LANCOM VoIP
Router can be connected to a point-to-multipoint connection.
Point-to-point connection (point-to-point): This type of device is suitable
for the connection of one ISDN device only, generally an ISDN PBX. As an
alternative, a LANCOM VoIP Router can be connected to a point-to-point
connection.
To connect a LANCOM VoIP Router, the interface that is used is set up for the
type of line in use.
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