1. Voice Over IP (VoIP)

2. Boyapati, Roopesh Understanding VoIP ConceptsComponentsFunctionalityProtocolsChallengesDemo

3. Boyapati, Roopesh Why VoIP? EconomyMobility Local Numbers

4. Boyapati, Roopesh VoIP Overview

5. Boyapati, Roopesh ATA (analog telephone adapter) Provides Dial tone Provides Ring Signal for incoming calls Analog to Digital conversion (Outgoing calls) Digital to Analog (Incoming calls) 2 Types

6. Boyapati, Roopesh CODEC Audio Signal Conversion G.711: 64000/ second G.729A: 8000/ second

7. Boyapati, Roopesh Soft Switches Call Processor Phone number associated with that end point End point’s current IP address Specialized database/ mapping program.

8. Boyapati, Roopesh Calling Process Pick Receiver, this sends signal to ATA ATA checks n/w connectivity and sends dial tone Dial Phone Number Phone number sent to VoIP service providers call processor Soft switch connects both ends Signal sent to receiver’s ATA to ring

9. Boyapati, Roopesh Protocols H.323 Session Initiation Protocol RTPRTCP

10. Boyapati, Roopesh H323 Developed by ITU Uses signaling messages

11. Boyapati, Roopesh SIP Defined by RFC 3261 Application Layer Protocol Used to initiate, maintain and terminate sessions Independent of underlying transport protocol

12. Boyapati, Roopesh RTP Real Time Transport Protocol By IETF, 1996 Works with all signaling protocols Operates at transport layer Independent of transport protocols used Transports real time data

13. Boyapati, Roopesh RTP (contd.) Contains incrementing sequence number in each packet Contains a sync source identifier and a time stamp

14. Boyapati, Roopesh Real Time Control Protocol Works hand in hand with RTP RTP does data delivery while RTCP sends control packets Ensure QoS to sender Reports percentage of packet loss and jitter

15. Boyapati, Roopesh DEMO

16. Challenges Available bandwidth Delay/Network Latency Packet loss JitterEchoSecurityReliability Pulse dialing to DTMF translation Emergency 911 Calls

17. Boyapati, Roopesh References http://www.compare-voip.net/articles/voip-adapters.php http://communication.howstuffworks.com/ip-telephony7.htm www.protocols.com/pbook/VoIPFamily.htm http://communication.howstuffworks.com/ip-telephony6.htm www.wikipedia.org

18. Boyapati, Roopesh Thank You !