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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
IP Telephony

Guided by: Presented by: Dr.S.K.Ghosh Nitesh Jain

05IT6008

M.Tech 1st year

IP Telephony


Contents
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


Introduction
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


Introduction cont
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


Different types of ip telephony
Different Types Of IP Telephony

  • PC to PC

  • Phone-to-phone over IP

  • PC-to-Phone

  • Phone-to-PC

IP Telephony


Pc to pc
PC to PC

Figure 1 (ref: www.iec.com)

IP Telephony


Phone to phone over ip using gateways
Phone-to-phone over IP using Gateways

Figure 2 (ref: www.iec.com)

IP Telephony


Phone to phone over ip using adapter boxes
Phone-to-phone over IP using Adapter Boxes

Figure 3 (ref: www.iec.com)

IP Telephony


Pc to phone or phone to pc
PC-to-Phone or Phone-to-PC

Figure 4 (ref: www.iec.com)

IP Telephony


Different type of ip telephony standard
Different type of IP telephony Standard

  • H.323 standard

  • Session initiation protocol (SIP)

  • Media gateway to media controller protocol (MGCP)

IP Telephony


What is h 323
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


H 323 components
H.323 Components

  • Terminals

  • Gateways

  • Gatekeepers

  • Multipoint Control Units (MCUs)

IP Telephony


  • 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


Gatekeepers
Gatekeepers

  • Address Translation

  • Admission Control

  • Bandwidth Control

  • Zone Management

  • Call-Control Signaling

  • Call Authorization

  • Call Management

IP Telephony


Multipoint control units
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


Protocols specified by h 323
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


H 225 ras
H.225 RAS

  • Gatekeeper discovery

  • Endpoint registration

  • Endpoint location

  • Admission control

IP Telephony


H 225 call signaling
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


Real time transport protocol
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


H 323 call establishment
H.323 Call Establishment

Figure 5 (ref: www.iec.com)

IP Telephony


H 323 control signaling flows
H.323 Control signaling Flows

Figure 6 (ref: www.iec.com)

IP Telephony


H 323 media stream media control flow
H.323 Media stream & media control flow

Figure 7 (ref: www.iec.com)

IP Telephony


H 323 call release
H.323 Call Release

Figure 8 (ref: www.iec.com)

IP Telephony


Conclusion
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


References
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


Thank you
THANK YOU

?

IP Telephony


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