Re: [MMUSIC] WGLC comments on draft-ietf-mmusic-sdp-bundle-negotiation-12 - Paul's comments

[Paul Kyzivat <[e-mail]>]

On 10/21/14 12:29 PM, Christer Holmberg wrote:

>>>>> What would you like to mention about SCTP?
>>>>>
>>>>>> IIUC, DTLS/SRTP uses DTLS packets to do key exchange, but doesn't
>>>>>> use DTLS payload packets. So *one* m-line with a protocol that uses
>>>>>> DTLS payload packets (e.g., >DTLS/SCTP) can coexist with STUN and
>>>>>> SRTP. If there is more than one such m-line then some other specification is required to associate those packets with m-lines.
>>>>>
>>>>> I think that is covered, as SRTP is distinguished from DTLS.
>>>>>
>>>>> But, if you think that needs to be more clear, maybe the following modified sentence:
>>>>>
>>>>> 	"[RFC5764] does not describe how to identify different protocols transported on DTLS (i.e. using DTLS payload packets), only how to..."
>>>>
>>>> I think this document should bite the bullet and define how SCTP coexists with SRTP in a bundle.
>>>
>>> Personally, I would not want to do that at this stage. We decided earlier that the draft will cover
>>> DTLS, SRTP and STUN, and that any other protocols/combinations have to be defined elsewhere.
>>
>> If it isn't here, then it needs to be somewhere else. Where?
>
> In a separate draft.
>
>> It shouldn't be hard.
>
> Who is asking for it? RTCWEB will not support SCTP transport (they will support SCTP over DTLS).

I'll be satisfied if it covers SCTP over DTLS. That is the case where it 
needs to be able to coexist with RTP.

	Thanks,
	Paul