Analysing VoIP
VoIP or voice over internet telephony is helping corporates and other businesses alike by offering various features.
Source: ezinearticles.com

Life Cycle of a Converged Network - Ongoing Operations and Network Optimization
If VoIP is the voice aspect in the triple play of IP Telephony, then IPT can be thought of as just one aspect in the broader scope of Unified Communications. As organizations seek to converge all communications, both real time and non real time, to an IP infrastructure, new applications are being developed and deployed. Unified Communications cover a range of applications from audio/video conferencing, blogging, mobility, wireless VoIP, distance learning, instant messaging, wikis, collaborative desktop applications, and presence, just to name a few.
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How Does VoIP Service Work?
VoIP technology is a one way of sending a voice signal also known as an analog signal in a medium which is digital, i.e, the internet. In practice, the process works like this - when you have a standard analog telephone attached to your high speed internet connection with VoIP service. There will be an analog telephone adapter or ATA between the phone and the computer.
Source: ezinearticles.com