SDP Offer Answer Examples

IETF-55 draft-johnston-mmusic-offer-answer-examples-00.txt

1

SDP Offer Answer Examples

Alan Johnston & Robert Sparks

IETF-55 draft-johnston-mmusic-offer-answer-examples-00.txt

2

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

3

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

4

Contents

• Codec Negotiation and Selection

• Hold and Resume

• Addition and Deletion of Streams

• 3pcc

IETF-55 draft-johnston-mmusic-offer-answer-examples-00.txt

5

Plan

• Careful review by implementors

• Addition of new scenarios– Suggestions most welcome

• WG interest?

IETF-55 draft-johnston-mmusic-offer-answer-examples-00.txt

6

Contacts

Alan Johnston

alan.johnston@wcom.com

sip:alan@digitalari.com

Robert Sparks

rsparks@dynamicsoft.com

sip:rsparks@dynamicsoft.com