…2014-07-04 Expired WG Document 1 Ari Keränen 92 pages 1998-04 Proposed Standard RFC Obsoleted by rfc7826 2 42 pages 1998-04 Proposed Standard RFC Obsoleted by rfc4566 Updated by rfc3266 2 151 pages RFC 2543 SIP: Session Initiation Protocol 1999-03 Proposed Standard RFC Obsoleted …