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Leon.... or whoever is providing the router/equipment also knows because they should have implemented the isdn back up feature in the router to work w/ the appropriate interface.

It appears that you are using ISDN/PRI as a 'dial back up' means in the event you lose your FR/connection. Some customers implement a back up method to their FR network if the data is critical. It appears the Colo Site and Site 2 are critical data, thus the reason for the ISDN/PRI. A FR...

what's the application and protocol that you are running on this data link?

DS3, 45 Mbps Coaxial cable 450 feet (137 meters) http://www.cisco.com/univercd/cc/td/doc/product/atm/ls1010s/wa5/12/8_17b/pam_gd/pam_ins.htm#xtocid270132

controller T1 1/0/0:1 > framing esf > pri-group timeslots 1-24 nfas_d primary nfas_int 0 nfas_group 1 >! >controller T1 1/0/0:2 > framing esf > pri-group timeslots 1-24 nfas_d backup nfas_int 1 nfas_group 1

Jibber...What are you trying to establish with the ISDN PRI Card in the router?? Typically the Card could handle the PRI/ISDN line (24b and 1 D channel). You would have to establish the same D channel protocol between you and your provider's ISDN switch (ie. 5ESS or DMS250, etc).... Are you...

Not knowing the exact locations of Madison or St. Paul, here's what I suspect: (a) Check to see if Madison's BRI/ISDN service is set up for ciruit switched data. It could only be set up for ckt switched voice. Therefore, when Madison launches a call, the LEC is trying to launch a voice call to...

I've successfully done this using the DTR command in the cisco routers... We placed the ISDN line on each routers' serial interface 1. Upon failure of the 128k circuit or T-1, the Cisco router will switch traffic from serial interface 0 to serial interface 1 and automatically establish an ISDN...