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What sort of card are neded for ISDN lines.Would you still use TDM cards
You don't state if its BRI or PRI ISDN lines.
I'm using BRI lines and currently have 2x HFC chipset ISDN PCI cards working perfectly. Cards cost around R250 per card.
For PRI lines I would recommend the Digium products and Sangoma products.
I wrote a nice tutorial on how to get Trixbox and Misdn working with HFC based cards, if you like PM me your email address and I will send you or anyone the howto.