1. We'll be using analog PSTN phone lines. Is there anything that I should
ask the telecom company before I buy the card? What I mean is whether the
card will be compatible with the line?


Just regular lines... not T1 or PRI?   You shouldn't have any issues.


2. What about the hardware on the PC? I will be using at least a Pentium 3
with a 600 or 700 MHz processor with at least 256 MB. Is there a way to know
how much traffic or calls it can handle?


This is a little on the low side.   Is this a system for work?  If so, I'd
suggest a GIG of RAM and at least a 1Ghz processor.


3. Suppose I buy a TDM04B card. It has 4 FXO modules and 0 FXS module. Later
I decide that I need a TDM13B configuration. Can I just buy 1 FXS S110M
module and replace one existing FXO module myself and reconfigure Asterisk?


Absolutely!



4. Does fax work fine with Asterisk? Should I use one FXS module for each
fax machine?



Fax works ok as long as you aren't going over a high latency VoIP
connection.  PSTN to FXO should work ok.


5. Is the power connector on the card identical to the power connectors
inside PCs?


Yes, but you only need this if you hook up FXS modules.


Thank you for any help.


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