[EMAIL PROTECTED] wrote:
Thank you W, asking differently:

(Suppose) I have a very reliable hardware,motherboard,power
supply,bios,kernel,configuration, I have reliable and fast everything.

Now what is the maximum number of FXO/FXS modules? What does it depend in
asterisk/tdm cards now?

Why are you so desperate for TDM400P cards? Don't put more than three Digium cards in one box. IRQ shareing is one of the problems. There is also the problem that each card generates 1,000 interrupts per second. If you want more than 8 or 12 ports then get a T-1 card and a Channel Bank. The channel bank will convert the T-1 channels to/from Asterisk into analog ports for you.
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