Telephony & VoIP Essentials

New to voice technology? This beginner course gives you the rock-solid foundation every VoIP and unified-communications topic builds on. In five visual, example-rich modules you’ll learn how traditional phone calls work, how VoIP turns your voice into packets, how SIP sets up a call and RTP carries it, how codecs trade bandwidth for quality, and why networks, NAT and QoS make or break call quality. Every concept is grounded in real standards (ITU-T G.711/G.114, IETF SIP/RTP) and reinforced with diagrams, worked bandwidth math, quizzes and real-world case studies — finishing with a hands-on design assignment.

You will be able to: read a SIP call flow · size internet bandwidth for voice · choose the right codec · diagnose why a call sounds bad · and speak the language of every voice engineer.