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17Chapter
VoIP: Voice over
Internet Protocol
Globally, telephony infrastructure is rapidly evolving from circuit switching to
IP-based packet switching. erefore, no link is dedicated to a voice call. is is
a huge advantage and frees organizations from the costs of leased lines that are
wholly dedicated to voice calls and another for data. Voice over Internet Protocol
(VoIP) is therefore becoming more common and popular. IP telephony thus is
emerging as one of the fastest-growing IP network services.
How to transmit voice over a packet network was developed decades ago. Voice is
typically sampled at 8 bits per sample (8 kHz),