Terry, It is now covered in 21.1:
"Provisional (1xx) responses MAY contain message bodies, including session descriptions." and in 21.1.5: "The 183 (Session Progress) response is used to convey information about the progress of the call that is not otherwise classified. The Reason-Phrase, header fields, or message body MAY be used to convey more details about the call progress." Note that SDP in a 1xx can mean many things, not just inband alerting or progress tones. For more details of how to use 183 and 180 for PSTN interworking, see draft-ietf-sipping-isup-00.txt. Thanks, Alan Johnston WorldCom sip:[EMAIL PROTECTED] > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]] On Behalf Of > Terry L Anderson > Sent: Thursday, February 28, 2002 3:42 PM > To: SIP Implementors > Cc: Jonathan Rosenberg > Subject: [Sip-implementors] Ringtone and 1xx > > > Up through bis-04 there was a statement in Informational 1xx > section that stated: > > "If a 1xx response contains a session description, a UAC > SHOULD cease generating local ringback tone." > > This was omitted beginning with bis-05 and I find no > equivalent statement elsewhere. Was this omission intended > to imply a removal of this behavior or have I missed where > this is now stated? > > -- > > ------------------------------------------------------------ > Terry L Anderson mailto:[EMAIL PROTECTED] > Tel:908.582.7013 Fax:908.582.6729 > Lucent Technologies/INS/Voice Over IP Access Networks > Rm 2B-121, 600 Mountain Av, Murray Hill, NJ 07974 http://its.lucent.com/~tla (Lucent internal) http://www.gti.net/tla _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
