Re: [MMUSIC] Mirja Kühlewind's Discuss on draft-ietf-mmusic-sctp-sdp-23: (with DISCUSS)

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 16 February 2017 15:01 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "Mirja Kuehlewind (IETF)" <ietf@kuehlewind.net>
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Date: Thu, 16 Feb 2017 15:00:42 +0000
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Subject: Re: [MMUSIC] =?iso-8859-1?q?Mirja_K=FChlewind=27s_Discuss_on_draft-ie?= =?iso-8859-1?q?tf-mmusic-sctp-sdp-23=3A_=28with_DISCUSS=29?=
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Hi,

----------------------------------------------------------------------
DISCUSS:
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>>> Why is this using TCP/DTLS/SCTP instead of TCP/TLS/SCTP?	
>>> 
>> Because the way it is realized is by transporting SCTP on top of DTLS (as defined in draft-ietf-tsvwg-sctp-dtls-encaps) and 
>> transporting DTLS on top of TCP (defined in RFC 4571).
>
> I got this but DTLS is a mapping to use TLS with UDP because UDP is an unreliable datagram transport. If you use TCP, you 
> should use TLS. And rfc4571 is not a mapping of DTLS to TCP.

The framing mechanism of RFC 4571 is used, with DTLS packets sent instead of RTP packets.

Regards,

Christer