Voice Over IP

BARRIERS TO SUCCESSFUL DEPLOYMENT OF IP TELEPHONY

It is the view of many that IP telephony (and voice over other data networks) is a given because of the reasons just cited. However, the deployment of VoIP is not a trivial matter. The principal reason for this statement is that the Internet protocol suite (and other data networks) is not designed to accommodate synchronous, real-time traffic, such as voice. In addition, the traffic loss experienced in IP networks as well as the amount and variability of delay militates against effective support of voice and video traffic.

Variable delay is onerous to speech. It complicates the receiver's job of playing out the speech image to the listener. Furthermore, the delay of the speech signal between ...