Re: Comments on draft-ietf-mmusic-sdp-directory-type-00.txt

[Ross Finlayson <[e-mail]>]

Colin,

Thanks for the comments.

>  - When defining RTP payload formats, the combination of the m= and
>    a=rtpmap lines in SDP to define a MIME type for the payload format.
>    This may imply that the use of m=directory is referencing a top level
>    MIME directory type, which is presumably not intended?

Good point.  I'm not a MIME expert - perhaps the format name should instead 
be "application/directory", i.e.,
         m=application/directory <port> SAP
??  Is this consistent with the use of MIME to specify other (existing) 
kinds of 'directory' - e.g., LDAP?  (I can imagine that in the future we 
might also want to allow for SDP descriptions that describe LDAP 
directories.)  Anyway, I'll make sure to raise this issue in Adelaide.

>   I suggest that text is added to state that sessions announced within a
>    directory SHOULD NOT be announced outside the time period specified in
>    the description of that directory, and SHOULD NOT be announced after a
>    deletion message has been received for the directory.

Yes, good point.  This, of course, is something that's true for any media 
type - e.g., participants should also stop sending to an audio/video 
sessions after their multicast address(es) have expired - but it's worth 
reemphasizing in the context of directory sessions.

         Ross.