Aarti-SIP

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Session Initiation Protocol(SIP) : 

Session Initiation Protocol(SIP) Aarti Gupta

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

Slide 7: 

Courtesy – The RADVISION SIP Whitepaper

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 Client SIP Client dynamic.com columbia.edu SIP Redirect server SIP proxy foo.com Location service proxy sales.foo.com 1 2 3 4 5 6 7 8 9 10 11 12 13

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

Slide 14: 

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

Slide 18: 

Thank you

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