----- Original Message ----- From: "Christer Holmberg" <[EMAIL PROTECTED]> To: "Bob Penfield" <[EMAIL PROTECTED]> Cc: "Sarju Garg" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Wednesday, November 14, 2001 6:29 AM Subject: Re: [Sip-implementors] Use of INFO before sending ACK
> > Hi Bob, > > >Just to clarify myself, A 1xx response is not required to have a To tag. A > >To tag is required to establish a dialog. A 1xx without a tag is still > >outside of a dialog. > > My understanding of chapter 8.2.7 in bis-05 is that a 1xx (non-100, that > is) provisional response MUST contain a To tag. > > This was discussed on the SIP mailing list a long time ago. If I > remember correctly the use of the To tag in provisional responses was > then added to the bis as a SHOULD, but has then became mandatory. > OK. I guess that is not crystal clear in bis-05. A 100-Trying does not have to have a tag. If an element has not decided yet whether it is going to be the UAS or a proxy for the request, then it would not add the tag. But then I guess it is not a UAS at that point and the tag rule does not apply. _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
