[MMUSIC] Fixing draft-holmberg-mmusic-sdp-dtls-00

[Martin Thomson <[e-mail]>]

Some of the statements here are backwards.  For example,

   If an endpoint changes the local transport parameters associated with
   a DTLS association, the endpoint MUST create a new DTLS association.

I think that this document can be reduced to a series of conditionals:

If you change the endpoint that is participating (because forking, or
for any other reason), then you need a new DTLS association.
Otherwise, how will that new endpoint know what keys to use.

If you change the certificate you intend to use, then you need a new
DTLS association.  Otherwise, you don't get to send the new
certificate.

If you change the DTLS roles, then you need a new DTLS association.
Otherwise, it doesn't happen.

If you request a new DTLS association, then you need a new transport.
Otherwise, demux issues.

An ICE restart is not sufficient a change to constitute a new
transport.  You need entirely new IP+port pairs.