[Asterisk-Users] so what are the additional hardware components needed?

[infra struct]

I have 20 personal computers in LAN with full duplex soundcard, microphone(headset) 

I will use this setup for making PC to PC phone calls

in addition I have a Linux server, in which i will be installing asterisk 

and 

Internet Connection - DSL of speed 128kbps 

I will be using asterisk for making calls to PSTN numbers(PC to Phone calls) 

so what are the additional hardware components needed? 

i figured out,
Digium X100P (Asterisk, Linux server, X100P is for PSTN connectivity (1 line) ) 
TDM400P on clients, in all Personal Computers (which also have Softphones like SJPhone,As the softphones can also make PSTN calls) 

Please users any comments about my finding?

		
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