But how VoIP companies work actually? How they are organized what equipment is needed to provide VoIP services and how to buy it cheap? As for every product, the same refers to VoIP too: buy VoIP wholesale and then sell it part by part. Simple as that, but there are complications behind that simplicity.
Guessing your mind that you want to establish wholesale VoIP business yourself, let's go through basic requirements for becoming a wholesale VoIP provider. This is a general overview for giving the first impression on the issue.
You will basically need the hardware equipment, one or better two servers, a Softswitch (explained below), suppliers of traffic and clients (resellers).
In case if you can afford two servers, one can be used for billing (and where the Softswitch will be installed), and the second for the Radius server soft (responsible for central authentication, authorization, and account management for clients when they want to connect and use the service and also for a certain RTP (a protocol for sending video and audio steams over IP networks). If you will be dealing with huge traffic, then of course two PCs are recommended to use RTP and Radius separately.
Now about Softswitch. To put plainly, it is a virtual device, which connects phone calls from one line to another within Telecom network or public web. It is very important to get assured that Softswitch comes with Billing platform installed. Billing is how you get information on the call details. Call Detail Reports (CDRs), which are generated by the billing, are used to charging the clients. If the Softswitch does not incorporate Billing, then the latter needs to be bought separately. Modern Softswitches are capable to automatically generate and send invoices, they come also with traffic analyzer, traffic control system, etc.
With this all in place, you are ready to go, but this is already another story. With good advertisement campaigns and correct marketing, you should have no problems in establishing the right connections with other wholesale VoIP providers and then getting reliable and longterm clients. Good luck.