Last Call Review of draft-ietf-mmusic-sctp-sdp-22

Request Review of draft-ietf-mmusic-sctp-sdp
Requested rev. no specific revision (document currently at 26)
Type Last Call Review
Team General Area Review Team (Gen-ART) (genart)
Deadline 2017-02-09
Requested 2017-01-26
Authors Christer Holmberg, Roman Shpount, Salvatore Loreto, Gonzalo Camarillo
Draft last updated 2017-02-04
Completed reviews Secdir Last Call review of -23 by Paul Wouters (diff)
Genart Last Call review of -22 by Brian Carpenter (diff)
Tsvart Last Call review of -23 by Martin Stiemerling (diff)
Genart Telechat review of -23 by Brian Carpenter (diff)
Assignment Reviewer Brian Carpenter 
State Completed
Review review-ietf-mmusic-sctp-sdp-22-genart-lc-carpenter-2017-02-04
Reviewed rev. 22 (document currently at 26)
Review result Ready with Nits
Review completed: 2017-02-04


Gen-ART Last Call review of draft-ietf-mmusic-sctp-sdp-22

I am the assigned Gen-ART reviewer for this draft. The General Area
Review Team (Gen-ART) reviews all IETF documents being processed
by the IESG for the IETF Chair.  Please treat these comments just
like any other last call comments.

For more information, please see the FAQ at

Document: draft-ietf-mmusic-sctp-sdp-22.txt
Reviewer: Brian Carpenter
Review Date: 2017-02-XX
IETF LC End Date: 2017-02-09
IESG Telechat date:  

Summary: Ready with nits


Two points I noted in the writeup:
"There are existing implementations of earlier versions of the document..."

Excellent, but I wonder why we don't see Implementation Status sections
under RFC 6982 in more Last Call drafts.

"IPv6 address examples are not necessary since IP version differences are immaterial to the purpose of the specification."

It's just as easy to give an IPv6 example though, and more future proof.

Minor issue: (almost a nit)

> 1.  Introduction
>   NOTE: Due to the characteristics of TCP, usage of 'TCP/DTLS/SCTP'
>   will always force ordered and reliable delivery of the SCTP packets,
>   which limits the usage of the SCTP options.  Therefore, it is
>   RECOMMENDED that TCP is only used in situations where UDP traffic is
>   blocked.

Why would one choose 'TCP/DTLS/SCTP' rather than just 'TCP/TLS'? I don't
object to it being specified, but since you don't support multihoming
or multiple associations, what is the use case, in a few words?


> 4.4.2.  SDP Media Description values
>      m= line parameter        parameter value(s)
>      ------------------------------------------------------------------
>      <media>:                 "application"
>      <proto>:                 "UDP/DTLS/SCTP" or "TCP/DTLS/SCTP"
>      <port>:                  UDP port number (for "UDP/DTLS/SCTP")
>                               TCP port number (for ""UDP/DTLS/SCTP")

I think the last line should be: TCP port number (for "TCP/DTLS/SCTP")

There is some inconsistency in the use of quotation marks: "UDP/DTLS/SCTP"