Cancel a request, end a session
04CANCEL and BYE operate at different points in the call lifecycle.
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 9 ↗
RFC 3261 · § 9EXAMPLE
3 / 3
03
BYE for established session
Terminate the resulting session with BYE instead of assuming CANCEL ended it.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
Read the updated RFC section ↗
CANCEL targets a pending request.
- CANCEL targets a pending request.
- It cannot undo a final response that has already won the race.
- BYE terminates an established session according to dialog rules.
The illustration is schematic. Example values are illustrative; profiles and later security guidance can add requirements.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
Privacy