VoIP server need fast internet connection, high end computers tight firewall or security and often maintenance.
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.
You can look at Microsoft's website and they have stuff you can look into for server virtualization. It is a little pricey but it will be well worth the money.
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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.
Not much disadvantages of using VoIP. Its worst scenario's can be an internet flactuation. Otherwise it is cost effective and reliable.
You need a VoIP modem or a computer to connect your phone and accessed your VoIP Server. Aditionally you also require an ATA adapter.
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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.
1.A web caching server in java. 2.VOIP
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
A software package called Asterisk markets itself as the right tool to turn your computer into a communications server. Then your computer will be able to successfully run programs like VOIP PBX.
ATA or analog telephone adapter will automatically connected to the when is it connected to internet.