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V O I P

V O I P. INTRODUCTION. VOICE OVER INTERNET PROTOCOL NETWORK VOICE PROTOCOL(1973) FOR ARPANET PROVIDERS. DIGITALLY TRANSMITTED VOICE THROUGH INTERNET. HOW IT WORKS. VOICE CONVERTED INTO DIGITAL SIGNAL SPLITTED INTO PACKETS TRAVEL THE INTERNET TOWARDS DESTINATION

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V O I P

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  1. V O I P

  2. INTRODUCTION • VOICE OVER INTERNET PROTOCOL • NETWORK VOICE PROTOCOL(1973) FOR ARPANET PROVIDERS. • DIGITALLY TRANSMITTED VOICE THROUGH INTERNET

  3. HOW IT WORKS • VOICE CONVERTED INTO DIGITAL SIGNAL • SPLITTED INTO PACKETS • TRAVEL THE INTERNET TOWARDS DESTINATION • AGAIN CONVERTED INTO ANALOG FORM

  4. EQUIPMENTS NEEDED TO ACCESE VOIP MAIN RESOURCE:- BROADBAND CONNECTION WITH SUFFICIENT SPEED THREE POSSIBLE WAYS • A SPECIAL VOIP PHONE • OUR TRADITIONAL PHONE WITH VOIP ADAPTER • COMPUTER WITH MICROPHONE AND SOME SOFTWARE(SOFTPHONE)

  5. STANDERED & PROTOCOL • INTERNATIONAL TELECOMMUNICATIONS UNION (ITU):- CONTROLS TELEPHONE STANDERED • INTERNET ENGINEERING TASK FORCE (IETF):- CONTROLS TCP/IP STANDERED CALL PROCESSOR:- • H/W RESIDES IN VOIP PROVIDERS. • TRANSLATE PHONE NO. INTO IP ADDRESS SOFT SWITCH:- S/W CONNECTS TWO DEVICES IN EITHER END • THREE PROTOCOLS:- • SIP(SESSION INITIATION PROTOCOL):- PROPOSED BY IETF. • H.323 :- PROPOSED BY ITU. • MEGACO & MGCP(MEDIA GATEWAY CONTROL PROTOCOL):- JOINTLY PROPOSED BY BOTH GROUPS.

  6. SESSION INITIATION PROTOCOL(SIP) • CHARACTERISTICS:- • OPERATE IN APPLICATION LAYER • USED FOR SIGNALING,NOTIFICATION,SETUP & TERMINATION • PROVIDES SERVICE SUCH AS CALL FORWARDING • RELIES ON MULTICAST FOR CONFERENCE CALL • SIP METHODS:- • INVITE • ACK • BYE • CANCEL • REGISTER

  7. SIP SESSION CREATION USER AGENT A DNS SERVER PROXY SERVER LOCATION SERVER USER AGENT B DNS QUERY DNS RESPONSE INVITE TRYING QUERY RESPONSE INVITE RINGING RINGING OK OK ACK ACK MEDIA SESSION BYE BYE OK OK

  8. ADVANTAGES • FUNCTIONALITY:- 1.INCLUDES MANY FEATURES WITH NO EXTRA CHARGE 2.PHONE CALL WITHOUT ANY COST 3.FREE PHONE NUMBER • MOBILITY :- 1.DIAL OR RECEIVE CALL FROM ANYWHERE 2. VERY USEFUL FOR WORKERS MIGRATING FROM ONE PLACE TO ANOTHER

  9. TECHNOLOGICAL CHALANGES • INTERNET CONNECTION NEEDED • DIFFICULTY WITH SENDING FAX • POWER OUTAGE • EMERGENCY 911 CALL • LATENCY • JITTER • QUALITY OF SERVICE(ECHO,NOISE,PACKET LOSS) • SECURITY(VIRUS,INTRUDERS,ENCRYPTION)

  10. CONCLUSION • Become an important technology for phone services to travelers, migrant workers who, either, due to not having a fixed or mobile phone or high overseas roaming charges, choose instead to use VoIP services to make their phone calls. • Pre-paid phone cards can be used . • Developing countries and areas with high tourist or immigrant communities generally have a higher uptake

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