ISDN call at both end - can it be?

Unanswered Question
Dec 17th, 2007

Hi all,

Currently, I design a ISDN WAN, which at both end router able to trigger ISDN call whenever the lease line is down. Let say, site A and site B. Lease line is connected in between. Whenever the lease line down, ISDN at site A must call to site B, BUT if the ISDN site A fail to dial, ISDN site B will definitely trigger the ISDN call to site A. I just wonder how to do this. Can anybody advise?? thank you.

I have this problem too.
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aansatosorigin Tue, 12/18/2007 - 05:22

Hi Dabdy,

Thanks for the link. By the way, how actually the second router (Kevin) can activate ISDN call to Krimson router although there's no any routing created whenever the Krimson router cant call to Keven router?? Hope you can explain technically. Really apprecite that.Thank you.

Danilo Dy Tue, 12/18/2007 - 05:56

Hi,

Yes, you're right Kevin is missing static routes.

Because the author want to minimize the number of devices to test the scenario - In the example, 10.8.8.1/24 is configured in Kevin's Loopback0 interface while 10.7.7.1/24 is configured in Krimson's Loopback0 interface. Therefore Krimson have the following route entries...

ip classless

ip route 10.8.8.0 255.255.255.0 10.1.2.2

ip route 10.8.8.0 255.255.255.0 10.9.9.2 180

...and Kevin should have the following route entries...

ip classless

ip route 10.7.7.0 255.255.255.0 10.1.2.1

ip route 10.7.7.0 255.255.255.0 10.9.9.1 180

Here's another example http://www.cisco.com/en/US/tech/tk713/tk237/technologies_configuration_example09186a00800a3b77.shtml

Regards,

Dandy

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