I have a client who wants a PBX system for an 8 user office. They have just 2 analogue lines, one of which is a fax. I've explained the fact one line is a bit lame but they said they don't get that many calls etc. so, my question is would 3CX (free?) do this job? They have no need for Voip - just a requirement for extensions. Also, would it be wise to run this on thir SBS2008 server?