Draytek Vigor2500V Manual page 181

Brief Overview
ADSL Router
VoIP
PSTN life line
ISDN loop through
ISDN backup
What does "PSTN life line" and "ISDN loop through" perform on
Vigor2500V series?
The Vigor2500V has a "Line" port on the rear panel for connecting to a PSTN
(regular analogue) line. The Loop Through option can be used to set an
alternate telephone number for your contact on the PSTN, which the
Vigor2500V will dial instead of the SIP account if you lose ADSL access or
power to the Vigor2500V. Hence, the PSTN line can act as a lifeline (backup
mechanism) for VoIP calls. The lifeline mechanism is activated automatically
but can also be manually configured.
Because there is ISDN interface on the Vigor2500Vi series, you can use the
ISDN line as phone line as well as Internet remote access/dial back-up for
ADSL. You will be able to still make ISDN phone calls if the router loses power
or the VoIP calls can not make as Internet access is broken. Hence, the ISDN
line can also be lifeline (backup mechanism) for VoIP calls.
TroubleShooting of Vigor2500V series
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