Asterisk works with Tainet Venus?

Hi,

My ISP provide me with analog phone via VoIP & Tainet Venus 2808 MGCP Gateway ( tainet.net/Product/venus.htm ). Question is: can I bypass that Tainet and use an Asterisk Server and how to do it?
I am new to all this VoIP thing… i just found the Digium Switchvox Free Edition and want to use it.

Thank you.