Contents

·       1)    Introduction

2)    A recent application of Internet technology

3)    How VoIP works

4)    Why VoIP

5)    Challenge

6)    Both groups agree  on the basics for encoding and transmission of audio

7)    Encoding, Transmission, & Playback

8)    Signaling Systems & Protocols

9)    A Basic IP Telephone System

10)    Interconnection with Others

11)    Signaling Protocols

12)    SIP: Session Initiation Protocol

13)    SIP defines three main elements that comprise a signaling system

14)    H.323 Characteristics

15)    H.323 Layering

16)    SIP Characteristics

17)    SIP Methods

18)    An Example SIP Session

19)    Telephone Number Mapping & Routing

20)    How should users be named?

21)    IETF proposed

22)    ENUM

23)    TRIP

24)    Analog telephone system continues to work when electrical power are unavailable

25)    Currently, IP telephones have to depend on an external source of power

26)    IP Telephones and Electrical Power

27)    Summary

 

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