%% You should probably cite rfc8262 instead of this I-D. @techreport{ietf-sipcore-content-id-09, number = {draft-ietf-sipcore-content-id-09}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-sipcore-content-id/09/}, author = {Christer Holmberg and Ivo Sedlacek}, title = {{Content-ID header field in Session Initiation Protocol (SIP)}}, pagetotal = 15, year = 2017, month = sep, day = 1, abstract = {This document specifies the Content-ID header field for usage in the Session Initiation Protocol (SIP). The document also updates RFC 5621, which only allows a Content-ID URL to reference a body part that is part of a multipart message-body. This update enables a Content-ID URL to reference a complete message-body and metadata provided by some additional SIP header fields. This document updates RFC 5368 and RFC 6442, by clarifying their usage of the SIP Content-ID header field.}, }