LANCOM 1722 VoIP – LANCOM 1724 VoIP
Chapter 1: Introduction
34
EN
"98" for ISDN or "97" for a SIP provider. The targeted call via this line is then
initiated with the corresponding identifier:
The call with "020 123456" is assigned to a corresponding line by the call
router, e.g. via the SIP PBX at the headquarters.
However, the call with "98 020 123456" is made directly via the ISDN
connection by the call router.
1.5.6
VoIP characteristics of the LANCOM VoIP Routers
Multiple ISDN interfaces
The ISDN ports (two with the LANCOM 1722 VoIP, four with the LANCOM
1724 VoIP) can be freely configured as internal or external connections and
offer up to eight parallel ISDN voice channels. This allows, for example, an
existing ISDN PBX to be additionally equipped with SIP and connected to an
upstream VoIP PBX. Subscribers can simultaneously make calls via ISDN tele-
phones, SIP equipment, or softphones to other SIP or ISDN subscribers, both
internally and externally. The transition between SIP and ISDN is automatic
and invisible to the user.
Telephone even during a power cut
With life-line support (LANCOM 1722 VoIP only) and power relay to the inter-
nal ISDN port, it remains possible to telephone via ISDN even in case of a
power outage. ISDN backup, load balancing and VRRP combined with up to
three Ethernet ports as WAN interfaces provide SIP connections with redun-
dancy and high reliability. If an SIP remote station should fail, switching auto-
matically reverts to ISDN. This ensures that telephony is just as reliable as ever,
even with VoIP.
Bandwidth reservation with failover
High-performance VPN functions allow the reliable transmission of voice and
data between company sites. This spares the telephone bill from internal com-
munications. A professional firewall, versatile routing functions and excellent
Quality of Service mechanisms make the LANCOM VoIP Router a comprehen-
sive solution for secure voice and data communication in a single compact
device. All functions are integrated into the central management functions.
Point- to-multipoint and point- to- point connections
LANCOM VoIP Routers support point-to-multipoint and point-to-point con-
nections:
