RFC3959: The Early Session Disposition Type for the Session Initiation Protocol (SIP)
Network Working Group G. Camarillo Request for Comments: 3959 Ericsson Category: Standards Track December 2004 The Early Session Disposition Type for t...
RFC3960: Early Media and Ringing Tone Generation in the Session Initiation Protocol (SIP)
Network Working Group G. Camarillo Request for Comments: 3960 Ericsson Category: Informational H. Schulzrinne Columbia University ...
RFC5009: Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for Authorization of Early Media
Network Working Group R. Ejzak Request for Comments: 5009 Alcatel-Lucent Category: Informational September 2007 Private Header (P-Header) Extension to the Session Initia...