There are many types of voip servers, these types depend on your requirments.
Out of these types Voip through Asterisk is the best as it is opensource and cost efective solution for you need .
For more details just check out http://www.asteriskgeekz.com
To setup a home VOIP system, the installer needs a VOIP adapter, modem, and internet connection. After connecting Line 1 of the adapter to a standard phone line, power on the VOIP adapter and wait for it to power up.
VoIP server has no radius since it is based via internet. As long as there is a connection of internet VoIP can be used too.
A typical VOIP to VOIP call transfers from your local network to the remote VOIP server. When the server receives the voice call packets, the destination header of these packets is read to direct them to the destination. These servers are connected to SIP trunk lines or termination routes. The voice packets are directed to these routes through this server.
VoIP server need fast internet connection, high end computers tight firewall or security and often maintenance.
Eircom install PSTN lines. UPC install VoIP over cable. Digiweb install VoIP over their Metro wireless service.
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You need a VoIP modem or a computer to connect your phone and accessed your VoIP Server. Aditionally you also require an ATA adapter.
Skype is an excellent VoIP software. It is easy to install and use. With Skype you may telephone or video chat with another Skype user no matter where they are. Another VoIP client is smart VoIP, a great service with cheap rates.
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You need to install a VoIP phone system with supported fax feature.
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In order to become a VoIP reseller you will need to have the knowledge of how VoIP works and what VoIP are currently used. You will also have to decide the application you wish to sell and once that is done you will have to decide which server you would want to resell. When all of that is completed you can contact the companies that offer the VoIP service and inquire directly about becoming a salesperson.
To install from source, you may have to use ./configure make make install each in case the server is a unix server