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IP Telephony

IP Telephony. Guided by: Presented by: Dr.S.K.Ghosh Nitesh Jain 05IT6008 M.Tech 1 st year. CONTENTS. INTRODUCTION DIFFERENT TYPES WHAT IS H.323 H.323 COMPONENTS PROTOCOL SPECIFED BY H.323

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IP Telephony

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  1. IP Telephony Guided by: Presented by: Dr.S.K.Ghosh Nitesh Jain 05IT6008 M.Tech 1st year IP Telephony

  2. CONTENTS • INTRODUCTION • DIFFERENT TYPES • WHAT IS H.323 • H.323 COMPONENTS • PROTOCOL SPECIFED BY H.323 • H.323 CALL ESTABLISHMENT • H.323 CONTROL SIGNALING FLOW • H.323 MEDIA STREAM & MEDIA CONTROL FLOW • H.323 CALL RELEASE • CONCLUSION IP Telephony

  3. Introduction • Internet telephony uses the Internet protocol to send audio, video an data between two or more users in the real time. • IP telephony is the integration and convergence of voice and data networks, services, and applications. • The main motivation of development of IP Telephony is the cost saving & integrating new services. IP Telephony

  4. Introduction (cont…) • Vocaltec introduced the first Internet telephony software product in early 1995. Running a multimedia PC, the Vocaltec Internet Phone. • In 1996, Vocaltec with an Intel Company announced to produce the first IP telephony gateway. IP Telephony

  5. Different Types Of IP Telephony • PC to PC • Phone-to-phone over IP • PC-to-Phone • Phone-to-PC IP Telephony

  6. PC to PC Figure 1 (ref: www.iec.com) IP Telephony

  7. Phone-to-phone over IP using Gateways Figure 2 (ref: www.iec.com) IP Telephony

  8. Phone-to-phone over IP using Adapter Boxes Figure 3 (ref: www.iec.com) IP Telephony

  9. PC-to-Phone or Phone-to-PC Figure 4 (ref: www.iec.com) IP Telephony

  10. Different type of IP telephony Standard • H.323 standard • Session initiation protocol (SIP) • Media gateway to media controller protocol (MGCP) IP Telephony

  11. What is H.323 • The H.323 standard for the transmission of real-time audio, video, and data communications over packet-based networks based on IP telephony. • H.323 is a standard produced by the ITU-T Study Group 16. • Currently the most widely-supported IP telephony signaling protocol. IP Telephony

  12. H.323 Components • Terminals • Gateways • Gatekeepers • Multipoint Control Units (MCUs) IP Telephony

  13. Terminals : H.323 terminal can either be a personal computer or a stand-alone device, running an H.323 and the multimedia applications. • Gateways : An H.323 gateway provides connectivity between an H.323 network and a non-H.323 network. IP Telephony

  14. Gatekeepers • Address Translation • Admission Control • Bandwidth Control • Zone Management • Call-Control Signaling • Call Authorization • Call Management IP Telephony

  15. Multipoint Control Units: • MCUs provide support for conferences of three or more H.323 terminals. All terminals participating in the conference establish a connection with the MCU. IP Telephony

  16. Protocols Specified by H.323 • audio CODECs • video CODECs • H.225 registration, admission, and status (RAS) • H .225 call signaling • H.245 control signaling • real-time transfer protocol (RTP) • real-time control protocol (RTCP) IP Telephony

  17. H.225 RAS • Gatekeeper discovery • Endpoint registration • Endpoint location • Admission control IP Telephony

  18. H .225 call signaling • H.225 call signaling is used to set up connections between H.323 endpoints over which the real-time data can be transported. • Two types : • Direct call signaling • Gateway routed call signaling H.245 Control Signaling • Capabilities Exchange • Logical Channel Signaling IP Telephony

  19. Real-Time Transport Protocol • Real-time transport protocol (RTP) provides end-to-end delivery services of real time audio and video. • RTP is used to transport data via the user datagram protocol Real-Time Control Protocol (RTCP) • RTCP provides control services for RTP. IP Telephony

  20. H.323 Call Establishment Figure 5 (ref: www.iec.com) IP Telephony

  21. H.323 Control signaling Flows Figure 6 (ref: www.iec.com) IP Telephony

  22. H.323 Media stream & media control flow Figure 7 (ref: www.iec.com) IP Telephony

  23. H.323 Call Release Figure 8 (ref: www.iec.com) IP Telephony

  24. Conclusion • Internet telephony is cost savings and integrating new services. • Internet Telephony is a powerful and economical communication options by combination of the telephone networks and data networks. • Many public telecommunication operators are establishing their own IP telephony services, and using IP-based networks as alternative transmission platforms. IP Telephony

  25. References : • Book on “IP Telephony“Olivier Hersent, David Gurle & Jean-Pierre Petit. • www.iec.org/online/tutorials/ • www.cis.ohio-state.edu/~jain/ • www.cs.columbia.edu/~coms6181/ • www.cisco.com/ • www.tmcnet.com/ • www.javvin.com/ IP Telephony

  26. THANK YOU ? IP Telephony

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