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IP Telephony

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Iftekhar Rizvi
Iftekhar Rizvi

The document discusses IP Telephony and the H.323 standard. It describes how IP Telephony uses the internet protocol to send audio, video, and data in real-time. The H.323 standard specifies protocols for multimedia communications over packet-based networks, including signaling protocols for call setup and control, as well as protocols for audio and video transport. The document outlines the components, protocols, call flows, and benefits of IP Telephony and the H.323 standard.

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IP Telephony Presented by: Syed Iftekhar Hussain Rizvi 09/03/2013 IP Telephony 1
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 09/03/2013 IP Telephony 2
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. 09/03/2013 IP Telephony 3
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. 09/03/2013 IP Telephony 4
Different Types Of IP Telephony • PC to PC • Phone-to-phone over IP • PC-to-Phone • Phone-to-PC 09/03/2013 IP Telephony 5
PC to PC Figure 1 (ref: www.iec.com) 09/03/2013 IP Telephony 6
Phone-to-phone over IP using Gateways Figure 2 (ref: www.iec.com) 09/03/2013 IP Telephony 7
Phone-to-phone over IP using Adapter Boxes Figure 3 (ref: www.iec.com) 09/03/2013 IP Telephony 8
PC-to-Phone or Phone-to- PC Figure 4 (ref: www.iec.com) 09/03/2013 IP Telephony 9
Different type of IP telephony Standard • H.323 standard • Session initiation protocol (SIP) • Media gateway to media controller protocol (MGCP) 09/03/2013 IP Telephony 10
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. 09/03/2013 IP Telephony 11
H.323 Components • Terminals • Gateways • Gatekeepers • Multipoint Control Units (MCUs) 09/03/2013 IP Telephony 12
• 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. 09/03/2013 IP Telephony 13
Gatekeepers • Address Translation • Admission Control • Bandwidth Control • Zone Management • Call-Control Signaling • Call Authorization • Call Management 09/03/2013 IP Telephony 14
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. 09/03/2013 IP Telephony 15
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) 09/03/2013 IP Telephony 16
H.225 RAS • Gatekeeper discovery • Endpoint registration • Endpoint location • Admission control 09/03/2013 IP Telephony 17
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 09/03/2013 IP Telephony 18
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. 09/03/2013 IP Telephony 19
H.323 Call Establishment Figure 5 (ref: www.iec.com) 09/03/2013 IP Telephony 20
H.323 Control signaling Flows Figure 6 (ref: www.iec.com) 09/03/2013 IP Telephony 21
H.323 Media stream & media control flow Figure 7 (ref: www.iec.com) 09/03/2013 IP Telephony 22
H.323 Call Release Figure 8 (ref: www.iec.com) 09/03/2013 IP Telephony 23
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. 09/03/2013 IP Telephony 24
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/ 09/03/2013 IP Telephony 25

More Related Content

IP Telephony

  • 1. IP Telephony Presented by: Syed Iftekhar Hussain Rizvi 09/03/2013 IP Telephony 1
  • 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 09/03/2013 IP Telephony 2
  • 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. 09/03/2013 IP Telephony 3
  • 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. 09/03/2013 IP Telephony 4
  • 5. Different Types Of IP Telephony • PC to PC • Phone-to-phone over IP • PC-to-Phone • Phone-to-PC 09/03/2013 IP Telephony 5
  • 6. PC to PC Figure 1 (ref: www.iec.com) 09/03/2013 IP Telephony 6
  • 7. Phone-to-phone over IP using Gateways Figure 2 (ref: www.iec.com) 09/03/2013 IP Telephony 7
  • 8. Phone-to-phone over IP using Adapter Boxes Figure 3 (ref: www.iec.com) 09/03/2013 IP Telephony 8
  • 9. PC-to-Phone or Phone-to- PC Figure 4 (ref: www.iec.com) 09/03/2013 IP Telephony 9
  • 10. Different type of IP telephony Standard • H.323 standard • Session initiation protocol (SIP) • Media gateway to media controller protocol (MGCP) 09/03/2013 IP Telephony 10
  • 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. 09/03/2013 IP Telephony 11
  • 12. H.323 Components • Terminals • Gateways • Gatekeepers • Multipoint Control Units (MCUs) 09/03/2013 IP Telephony 12
  • 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. 09/03/2013 IP Telephony 13
  • 14. Gatekeepers • Address Translation • Admission Control • Bandwidth Control • Zone Management • Call-Control Signaling • Call Authorization • Call Management 09/03/2013 IP Telephony 14
  • 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. 09/03/2013 IP Telephony 15
  • 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) 09/03/2013 IP Telephony 16
  • 17. H.225 RAS • Gatekeeper discovery • Endpoint registration • Endpoint location • Admission control 09/03/2013 IP Telephony 17
  • 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 09/03/2013 IP Telephony 18
  • 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. 09/03/2013 IP Telephony 19
  • 20. H.323 Call Establishment Figure 5 (ref: www.iec.com) 09/03/2013 IP Telephony 20
  • 21. H.323 Control signaling Flows Figure 6 (ref: www.iec.com) 09/03/2013 IP Telephony 21
  • 22. H.323 Media stream & media control flow Figure 7 (ref: www.iec.com) 09/03/2013 IP Telephony 22
  • 23. H.323 Call Release Figure 8 (ref: www.iec.com) 09/03/2013 IP Telephony 23
  • 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. 09/03/2013 IP Telephony 24
  • 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/ 09/03/2013 IP Telephony 25