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Using ISDN lines (videoconferencing) as backup for T1 -

Our network currenlty connects to the internet via a 512 fractional T1 through a Cisco 1720 router. We also have 3 isdn lines in house that are used exclusively for video-conferencing. The ISDN lines connect to an ADTRAN NT1 (4 ports) which then connects to a Cisco IPVC video gateway. I want to know if there is a way (I'm sure some add'l hardware will be required) to use the ISDN lines (or a single line at least) as a backup internet connection when the T1 is down (unfortunately this has happened twice now in the past 3 months...) while still keeping them accessible for video conferencing.

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Re: Using ISDN lines (videoconferencing) as backup for T1 -

I think all you need is a BRI S/T interface on your 1720 router to support ISDN backup. You can daisy chain this port to the existing ISDN Line S-bus and share the line to make outgoing calls whenever your Fractional T1 goes down.

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