{"draft":"draft-ietf-sipping-cc-conferencing-07","doc_id":"RFC4579","title":"Session Initiation Protocol (SIP) Call Control - Conferencing for User Agents","authors":["A. Johnston","O. Levin"],"format":["ASCII","HTML"],"page_count":"43","pub_status":"BEST CURRENT PRACTICE","status":"BEST CURRENT PRACTICE","source":"Session Initiation Proposal Investigation","abstract":"This specification defines conferencing call control features for the\r\nSession Initiation Protocol (SIP).  This document builds on the\r\nConferencing Requirements and Framework documents to define how a\r\ntightly coupled SIP conference works.  The approach is explored from\r\nthe perspective of different user agent (UA) types:\r\nconference-unaware, conference-aware, and focus UAs.  The use of\r\nUniform Resource Identifiers (URIs) in conferencing, OPTIONS for\r\ncapabilities discovery, and call control using REFER are covered in\r\ndetail with example call flow diagrams.  The usage of the isfocus\r\nfeature tag is defined.  This document specifies an Internet Best Current Practices for the\r\nInternet Community, and requests discussion and suggestions for\r\nimprovements.","pub_date":"August 2006","keywords":["[--------|b]","ua","conference-unaware","conference-aware","focus"],"obsoletes":[],"obsoleted_by":[],"updates":[],"updated_by":[],"see_also":["BCP0119"],"doi":"10.17487\/RFC4579","errata_url":null}