IP TELEPHONY

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INTRODUCTION:-Internet telephony refer to communication service –voice fax , sms and voice messing application that are transport by internet, rather the public switch telephone network.
 The step involved in organizing a VoIP telephone call are signaling and media channel step , digital of the analog voice signal , encoding and transmission as INTERNET PROTOCOL (IP) packet over a packet switch network.
 On the receiving side similar step(only in the reverse order) such as reception of the IP packet, DECODING OG THE PACKET AND DIGITAL TO ANLOG CONVIRSION REPRODUSE THE ORIGINAL VOICE STREAM.

 PRINCIPAL:- A COMMUNICATION PROTOCOL IS A FORMAL DISCRIPTION OF DIGITAL MASSAGE FORMAT AND RULE OF EXCHANGE those massage in between computing system and telecommunication.


FEATURE:-
 Security:- From hackers
 Network address translator for traffic)
 Secure Real-time transport


ADVANTAGE:-
 Oprationl cost
 Easy
 Global
DISADVANTAGE:-
 Security risk
 Cyber crime


 CONCLUSION:- As the popularity of VoIP grows, and PSTN users switch to VoIP in increasing number. Government are more becoming more interested in regulating VoIP in manner similar to PSTN service.