1 / 26

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

crystal
Télécharger la présentation

IP Telephony

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related