this is my first post here… so be patient!
I’ve installed Asterisk onto a PC Intel PIV 3.4 GHz (1 Gbyte RAM) and I want to use it as a PBX for this scenario:
7 BRI ISDN Network Termination <—> PBX Asterisk <—> 20 IP phones
The choice for the interface card is multiple:
one passive 8 ports ISDN card (by beroNET or Juhnganns)
two active 4 ports AVM cards (the C4)
Considering the above mentioned hardware and scenario (20 concurrent calls), should I fear the CPU overload intrinsecally caused by passive cards?
Active cards are really expensive, but I can’t afford a crappy quality of the phone services… so, if needed, I’m ready to buy AVM active cards.