[Asterisk-Users] newbie to asterisk

[KH Chow]

Dear Sir / Madam,

I am a newbie in using Asterisk. I am interested in its SIP.
Before I start to use it, I would like to know whether the system can work between two Linux box without any FXO and FXS card and just using microphone which connect to the regular sound card? I am looking into others applications and all of them are using at least one FXS card. 
Sorry for such beginner problem and please help.
Thank you very much for your time.

Max
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