SDP Offer Answer Examples

1
SDP Offer Answer Examples

• Alan Johnston Robert Sparks

2
Motivation

• Experience from SIPit
• Lack of interesting SDP in SIP Call Flows
• Usage critical in some uses
• Codec negotiation
• 3pcc
• Call hold

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.

4
Contents

• Codec Negotiation and Selection
• Hold and Resume
• Addition and Deletion of Streams
• 3pcc

5
Plan

• Careful review by implementors
• Addition of new scenarios
• Suggestions most welcome
• WG interest?

6
Contacts

• Alan Johnston
• alan.johnston_at_wcom.com
• sipalan_at_digitalari.com

• Robert Sparks
• rsparks_at_dynamicsoft.com
• siprsparks_at_dynamicsoft.com