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Session Initiation Protocol (SIP) - PowerPoint PPT Presentation


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Session Initiation Protocol (SIP). Aarti Gupta. Agenda. Why do we need SIP ? The protocol Instant Messaging using SIP Internet Telephony with SIP Additional applications Future Directions. Introduction.

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Presentation Transcript
agenda
Agenda
  • Why do we need SIP ?
  • The protocol
  • Instant Messaging using SIP
  • Internet Telephony with SIP
  • Additional applications
  • Future Directions
introduction
Introduction
  • SIP is the core protocol for initiating, managing and terminating sessions in the Internet
  • These sessions may be text, voice, video or a combination of these
  • SIP sessions involve one or more participants and can use unicast or multicast communication.
sip entities
SIP entities
  • User Agent

User Agent Client

User Agent Server

  • Proxy Server
  • Redirect server
  • Registrar
sip message types
SIP Message Types

Requests – sent from client to server

  • INVITE
  • ACK
  • BYE
  • CANCEL
  • OPTIONS
  • REGISTER
  • INFO
sip message types contd
SIP Message Types (Contd.)

Responses – sent from server to the client

  • Success
  • Redirection
  • Forwarding
  • Request failure
  • Server failure
  • Global failure
sip session establishment and call termination
SIP Session Establishment and Call Termination

From the RADVISION whitepaper on SIP

sip call redirection
SIP Call Redirection

From the RADVISION whitepaper on SIP

call proxying
Call Proxying

From the RADVISION whitepaper on SIP

instant messaging based on sip
Instant messaging based on SIP
  • SIMPLE – IM protocol based on SIP
  • SIP promises interoperability between various IM vendors
  • “Forking proxy “
  • SIP has unique user tracking features.
  • SIP addressing
instant messaging contd
Instant Messaging (Contd.)

SIP Redirect server

columbia.edu

2

SIP proxy

5

Location

service

3

6

foo.com

dynamic.com

4

10

11

7

proxy

1

12

8

9

13

SIP Client

SIP Client

sales.foo.com

sip for internet telephony
SIP for Internet Telephony
  • Two types of phones – IP phones and conventional analog phones.
  • Uses phone numbers instead of IP addresses
  • To place a call to an IP phone, DNS is used
  • To place a call to an analog phone, gateway

protocols like BGP are used

slide14

SIP Protocol Use

Henning Schulzrinne’s tutorial on SIP

additional sip applications
Additional SIP applications
  • PINT (PSTN and Internetworking) protocol
  • Internet call waiting
what is the future of sip
What is the future of SIP
  • SIP is still a ‘proposed standard’
  • Competing protocol – H.323
  • IM vendors have not adopted SIP
references
References
  • Computer Telephony – June 2000
  • http://www.radvision.com
  • www.cs.columbia.edu/hgs/
  • www.networkcomputing.com
  • www.wikipedia.com