Table of Contents
SIP 183 Session Progress Message
Problem being solved
Example PSTN Call Flow - With ACM
PSTN Call Flow - Fast Answer
PSTN Call Flow - No Answer
Potential Solutions
Use of 100 Trying
Use of 180
Use of 200 - Typical Case
Use of 200 - Fast Answer
183 Session Progress
Use of 183 Session Progress
Proposed extensions to SIP
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Author: Steve Donovan
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