I have two-leased lines connecting two different sites to my central site. I have one ISDN as backup for these two leased lines. Should both leased fail at the same time how can I configure the ISDN to dial both the locations at the same time? I am using Cisco routers on all the locations.

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I doubt if that would be possible because you have only one D channel for both the BRI channels. I have come across many configurations where you can use same ISDN link to be used as backup for more than one leased lines but not simultaneously.

This was first published in May 2003

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