IP telephony is a service that uses the IP network, instead of the classic telephone network. IP telephony's main benefit is that it offers a platform on which we can roll out other Unified Communications services.
On top of that, IP telephony offers a lot of flexibility. Phones can be plugged into any network port, so a person may be moved around the office without a need to get a technician in to do the move. The best part, however, is that IP telephony allows you to better support your employees' productivity, with a wide range of functionalities, such as click-to-call, intelligent call routing, one number reach, etc.
Unified Communications offer the ability to converge voice, video and data traffic onto a single IP infrastructure that is flexible, agile and cost effective to manage, secure and scalable. A converged IP infrastructure is an effective deployment platform for advanced communication applications that can greatly improve organisational and personal efficiency, productivity and cost savings.