The IESG has approved the following document: - 'Content-ID header field in Session Initiation Protocol (SIP)' (draft-ietf-sipcore-content-id-10.txt) as Proposed Standard This document is the product of the Session Initiation Protocol Core Working Group. The IESG contact persons are Adam Roach, Alexey Melnikov and Ben Campbell. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-ietf-sipcore-content-id/ Technical Summary This document specifies the Content-ID header field for usage in the Session Initiation Protocol (SIP) to identify a complete message-body of a SIP message. The document also updates RFC 5621, to enable a Content-ID URL to reference a complete message-body and metadata provided by some additional SIP header fields. Working Group Summary Discussions about the Content-ID header field started in the ECRIT working group when the group identified cases where a request with a single message body also needs to include a Content-ID header field in the SIP message header to refer to the MIME entity, but the Content-ID header field was not actually a SIP header field, surprising some working group members. The authors brought the issue to the SIPCORE working group. There was consensus that this was an oversight in SIP. There was a discussion about perhaps adding all the Content-* MIME header fields as SIP header fields for completeness (SIP already has extended the some of the MIME header fields), but the working group decided to focus only on Content-ID since there wasn't a clear need for some of the others like Content-Transfer-Encoding. Document Quality This short document received detailed review from a handful of working group participants. The authors incorporated received feedback. Although the Document Shepherd is not aware of implementations, the Content-ID header field will be useful when transporting data for location conveyance and emergency calls. There may be implementations of Content-ID as a SIP header field since RFC 5368 shows Content-ID as a SIP header field in its examples. Personnel Jean Mahoney is the document shepherd. Ben Campbell is the responsible area director.
