The CANCEL should be identical to the corresponding INVITE request. So, it should not have the To tag.
However, incase of a re-INVITE, the INVITE itself will set the To tag. So, in that case the CANCEL must carry the To tag. Aza. Banibrata Dutta wrote: >hi, > >a CANCEL sent for an INVITE will in the INVITE initiated Dialog. So should >the CANCEL request have both the From & To tags, or just the From tag ? I >believe that both should be sent, because the full Dialog related >information could be available from the received provisional response (s.a. >182 or 183). > >thanks for any clarification. > >regards, >bdutta >_______________________________________________ >Sip-implementors mailing list >[email protected] >https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
