Information on RFC 3261 » RFC Editor
https://www.rfc-editor.org/info/rfc3261
WebStatus: PROPOSED STANDARD. Obsoletes: RFC 2543. Updated by: RFC 3265, RFC 3853, RFC 4320, RFC 4916, RFC 5393, RFC 5621, RFC 5626, RFC 5630, RFC 5922, RFC 5954, RFC 6026, RFC 6141, RFC 6665, RFC 6878, RFC 7462, RFC 7463, RFC 8217, RFC 8591, RFC 8760, RFC 8898, RFC 8996. Authors:
DA: 77 PA: 48 MOZ Rank: 74