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Best practice for Video over IP using ISDN WAN

I am looking for the best practice to ensure that the WAN has suffient active ISDN channels to support the video conference connection.

Reliance on load threshold either -

Takes to long for the ISDN calls to establish causing the problems for video setup

- or is too fast to place additional ISDN calls when only data is using the line

What I need is for the ISDN calls to be pre-established just prior to the video call. Have done this in the past with the "ppp multilink links minimum commmand but this manual intervention isn't the preferred option in this case

thanks

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