If we need any more motivation for this work, here is a quote from
draft-ietf-mmusic-file-transfer-mech-02.
The MMUSIC working group considered a few alternative
approaches before deciding to use the encoding described in
Section 6. In particular, the working group looked at the MIME
'external-body' type and the use of a single SDP parameter.
A MIME 'external-body' could potentially be used to describe the file
to be transfered. In fact, many of the SDP parameters this
specification defines are also supported by 'external-body' body
parts. The MMUSIC working group decided not to use 'external-body'
body parts because a number of existing offer/answer implementations
do not support multipart bodies.
I don't think we can hold that work hostage until there is better
support for multipart. But that means there is one more thing that has
been screwed around because of the lack of multipart support.
Paul
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