SIP User's Manual
3
.
Installing
the MediaPack
Version 2.4
29
June 2008
Figure
3-11: Single ISDN Subscriber Lifeline Cabling
Notes:
•
In the cable setup described above, the PSTN network is only
available upon a power outage. However, the Trunk interface that is
connected to the Lifeline port, can also be connected to an ISDN S/T
interface port (except S/T 0), by using an S-bus splitter. In such a
setup, the PSTN network is always available.
•
The ISDN phone must be configured with an MSN number(s) received
from the Service Provider.
•
The Lifeline cable setup can be reversed (i.e., the ISDN phone can be
connected to the
Lifeline
port, and the PSTN network can be
connected to the
S/T 0
port). However, in such a configuration, the
ISDN phone can only be used upon a power outage.
•
The Lifeline feature is only supported by certain MediaPack models
(i.e., MP-404 /BRI /ST /AC /LL and MP-408 /BRI /ST /AC /LL) and
therefore, only these models provide a Lifeline port.
3.4.6
Connecting the PSTN Fallback Port
The Fallback feature uses identical cabling as the normal ports. The PSTN fallback port
allocation depends on the MediaPack model:
MP-404 /BRI /ST /AC /FB:
ports 0 and 1 are interconnected if the gateway is not
powered
MP-408 /BRI /ST /AC /FB:
ports 0 and 1, and ports 2 and 3 are interconnected if the
gateway is not powered
Figure
3-12: Fallback Cabling (MP-404 /BRI /ST /AC /FB and MP-408 /BRI /ST /AC /FB)
