Hi Amit, Thank you for your Response Thanks for explaining the dot i was having with respect to the To-Tag in the INVITE request.
Thank you, With Regards Arun A. Tagare On Tue, Aug 5, 2014 at 12:25 PM, Amit Kumar Singh <amit2.si...@aricent.com> wrote: > Hi, > > Section 19.3 of RFC 3261 states the following: > > " The tag parameter is used in the To and From header fields of SIP > messages. It serves as a general mechanism to identify a dialog, which is > the combination of the Call-ID along with two tags, one from each > participant in the dialog. When a UA sends a request outside of a dialog, > it contains a From tag only, providing "half" of the dialog ID. The dialog > is completed from the response(s), each of which contributes the second > half in the To header field. The forking of SIP requests means that > multiple dialogs can be established from a single request. This also > explains the need for the two-sided dialog identifier; without a > contribution from the recipients, the originator could not disambiguate the > multiple dialogs established from a single request." > > As the RFC clearly states that the dialog is completed from the responses > thus it should be the UAS to generate the To Tag in the response not the > UAC. In the case of Forking of single SIP request, to avoid the ambiguity > in multiple dialogs contribution from the recipients (UAS), in our case To > Tag, is necessary. > > Regards, > Amit Kumar Singh > amit2.si...@aricent.com > > > > -----Original Message----- > From: sip-implementors-boun...@lists.cs.columbia.edu [mailto: > sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Arun Tagare > Sent: Tuesday, August 05, 2014 11:45 AM > To: sip-implementors@lists.cs.columbia.edu > Subject: [Sip-implementors] : No To-Tag in INVITE why? > > Hi All, > > Can any one explain me > Why there is no To-Tag in the INVITE Request? > > And what happens if i add To-Tag in the INVITE Request? > > -- > > With Regards > > Arun A. Tagare > +91 9449 029729 > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > "DISCLAIMER: This message is proprietary to Aricent and is intended solely > for the use of the individual to whom it is addressed. It may contain > privileged or confidential information and should not be circulated or used > for any purpose other than for what it is intended. If you have received > this message in error, please notify the originator immediately. If you are > not the intended recipient, you are notified that you are strictly > prohibited from using, copying, altering, or disclosing the contents of > this message. Aricent accepts no responsibility for loss or damage arising > from the use of the information transmitted by this email including damage > from virus." > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > -- With Regards Arun A. Tagare +91 9449 029729 _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
