[Asterisk-Users] what hardware components do i need?

[infra struct]

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

and 

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

and 

Internet Connection - DSL of speed 128kbps 

I will be using asterisk for making calls to PSTN numbers 

so what are the additional hardware components needed? 

suggestions please!

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