[nsp] ISDN Backup using DDR

[Prit Patel]

Hello All,

How can we configure DDR with backup interface using
ISDN line.

We have 3 remove name A,B & C site connecting to
CentralLocation XX. with E1 at each site. If E1 goes
down at remote location B or C that site should dial
to remote Site A and from there it get connectivity 
to central location XX. 

How can i configure DDR between all there remote site
A B and C so that B and C will connect to site A if E1
goes down at B and C location.

Regards
Prit Patel

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