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So what is VoIP?

Voice Over Internet Protocol (VoIP) is all about exchanging voice data through the internet. VoIP is a phrase used in IP telephony for a set of services using the Internet Protocol (IP). You can call any person across the world, not at the rate of a standard call, but for FREE. (excluding the cost for your internet connection). Voice over Internet Protocol (VoIP) utilizes IP architecture to provide the equivalent to traditional telecommunications providers that use the Public Switched Telephone Network (PSTN). The main benefit to VoIP is that a VoIP long distance call traverses the low-cost worldwide Internet infrastructure for the long-haul portion of the call, rather than having to pay high rates established by incumbent international carriers.

In the process of sending voice, VoIP uses the real-time protocol (RTP) to help and make sure that packets are delivered in the right direction and at real time speed.
The Real-Time Transport Protocol (RTP) is an Internet protocol standard that specifies a way for Voip to manage the real-time transmission of multimedia data over the internet.
It is maintained that VoIP is the “Voice” through the Internet. In this process the voice of the speaker is put into packets and is sent across the internet, when it gets to the receiver it is then taken out of the packets and put back into voice. A bit like a letter being put into an envelope the address of the sender and receiver is added and posted.

All this is usually accomplished using the The Session Initiation Protocol (SIP). This seems to be becoming the standard today.

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