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ISDN with callback gives odd results

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peterd51

Technical User
Joined
Feb 22, 2005
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109
Location
GB
Hi Guys,

I've taken over a network that has ISDN back-ups to the main routes, everything calls into the main site if the attached serial link goes down.

The company are using callback and I've not seen this before...basically there's a 'ppp callback request' added to the dialer 1 config of the calling router and a 'ppp callback accept' at the main site.

When using the 'isdn test call int bri1/0 <number>' command, some test calls stay on line until I issue the 'disconnect' while others drop after one second. Some of these dropped calls callback while others don't.

Any ideas why this should happen please?

Regards
Peter
 
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