what is local fax server?

I need send fax from local fax modem. the big part of the code was done in vs2010, so the fax needs be done in vs2010 too.

I found this, but then I'm confused. what is local fax server? does it come with win7 already? or, I need setup something as a physical server? or, is it a service in win7 (seems can not find it from service).

thanks

bear