IETF Session Initiation Protocol
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Transcript of IETF Session Initiation Protocol
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IETF Session Initiation Protocol
Henning Schulzrinne
Columbia University
New York, NY
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SIP Overview
• Lightweight signaling protocol– to be standardized within IETF MMUSIC
– invite to new and on-going conferences
– multicast and unicast (“telephony”)
– personal mobility
– call center: reach first, first all
– change and add media
– post dial delay: 1.5 RTT
– uses either UDP or TCP
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SIP and H.323
SIP H.32360+ pages 200+ pages (without
ASN.1)multicast signaling -personal mobility, INservices
Not (yet)
any session description H.245 1 audio, videoSSL, HTTP security in progress
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SIP addresses food chain
yellow pages “president of the United States”common names “Bill Clinton, Whitehouse”host-independent [email protected] sip://[email protected]
sip://[email protected]
IP address 198.137.241.30
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SIP protocol
• text based (~ HTTP)
• methodsINVITE call user
CONNECTED confirm connectionBYE tear down call
transfer callREGISTER sign up with serverUNREGISTER “leave” server
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SIP operation in redirect mode
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SIP operation in proxy mode
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SIP for Intelligent Networks• IN services “inside” & “outside” network
• UPN: translation by redirect server
• call forwarding: proxy, end system
• call transfer: BYE
• distinctive ringing: end system
• 800#: charging responsibility of resource reservation
• call center (queueing, first available)
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For more information...
• http://www.cs.columbia.edu/~hgs/sip• IETF MMUSIC mailing list:[email protected]