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SDP Offer Answer Examples. Alan Johnston & Robert Sparks. Motivation. Experience from SIPit Lack of interesting SDP in SIP Call Flows Usage critical in some uses: Codec negotiation 3pcc Call hold. Approach. Brief discussion of motivation and result of scenario. - PowerPoint PPT Presentation
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IETF-55 draft-johnston-mmusic-offer-answer-examples-00.txt
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SDP Offer Answer Examples
Alan Johnston & Robert Sparks
IETF-55 draft-johnston-mmusic-offer-answer-examples-00.txt
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Motivation
• Experience from SIPit
• Lack of interesting SDP in SIP Call Flows
• Usage critical in some uses:– Codec negotiation– 3pcc– Call hold
IETF-55 draft-johnston-mmusic-offer-answer-examples-00.txt
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Approach
• Brief discussion of motivation and result of scenario.
• Complete Offer/Answer (sometimes with 2nd exchange) SDP messages
• Include examples of:– multiple codecs, media types, direction
attributes, connection addresses, dynamic payloads, etc.
IETF-55 draft-johnston-mmusic-offer-answer-examples-00.txt
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Contents
• Codec Negotiation and Selection
• Hold and Resume
• Addition and Deletion of Streams
• 3pcc
IETF-55 draft-johnston-mmusic-offer-answer-examples-00.txt
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Plan
• Careful review by implementors
• Addition of new scenarios– Suggestions most welcome
• WG interest?
IETF-55 draft-johnston-mmusic-offer-answer-examples-00.txt
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Contacts
Alan Johnston
Robert Sparks
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