{"draft":"draft-ietf-sip-callee-caps-03","doc_id":"RFC3840","title":" Indicating User Agent Capabilities in the Session Initiation Protocol (SIP) ","authors":["J. Rosenberg","H. Schulzrinne","P. Kyzivat"],"format":["ASCII","HTML"],"page_count":"36","pub_status":"PROPOSED STANDARD","status":"PROPOSED STANDARD","source":"Session Initiation Protocol","abstract":" This specification defines mechanisms by which a Session Initiation Protocol (SIP) user agent can convey its capabilities and characteristics to other user agents and to the registrar for its domain.  This information is conveyed as parameters of the Contact header field.  [STANDARDS-TRACK]","pub_date":"July 2004","keywords":["User Agent","ua","contact header field","SIP","Session Initiation Protocol"],"obsoletes":[],"obsoleted_by":[],"updates":[],"updated_by":[],"see_also":[],"doi":"10.17487\/RFC3840","errata_url":null}