On Nov 1, 2011, at 12:03 AM, Iñaki Baz Castillo wrote:

> Thanks Kevin. But anyhow it seems that there is no SIP spec/RFC
> defining a binary body, am I wrong?

RFC 3204 is used for ISUP and QSIG bodies, for example in SIP-T/SIP-I 
scenarios.  And that really is used by SIP in the real world - a LOT.
(not by user endpoints though obviously)

RFC 3853 defines S/MIME AES as binary in SIP, though I don't know of anyone 
implementing that.

Microsoft sends binary-enoded MIME payloads in SIP MESSAGE requests in certain 
Instant-Messaging use-cases.

And someone sends binary encoded payloads for DTMF indications in SIP NOTIFY 
requests - I don't remember who it is, but I remember it because it's so crazy 
(the MIME body's content is literally an RFC 2833 RTP DTMF event packet, minus 
the IP and UDP header).

-hadriel


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