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Re: [AVTCORE] RTP Header Extension Encryption

Magnus Westerlund <magnus.westerlund@ericsson.com> Thu, 17 September 2020 08:26 UTC

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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: "magnus.westerlund=40ericsson.com@dmarc.ietf.org" <magnus.westerlund=40ericsson.com@dmarc.ietf.org>, "harald@alvestrand.no" <harald@alvestrand.no>, "avt@ietf.org" <avt@ietf.org>
Thread-Topic: [AVTCORE] RTP Header Extension Encryption
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Date: Thu, 17 Sep 2020 08:26:40 +0000
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Subject: Re: [AVTCORE] RTP Header Extension Encryption
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Hi,

A Clarification to the RTP session definition.

> > > The term in the RTP vocabulary that makes sense are to have header
> > > encryption
> > > configuration be applied on the RTP session.
> > > 
> > > A boundle group will be one RTP session as they share BUNDLE Transport
> > > parameters.
> > 
> > 
> > I think this is wrong. An RTP session can cover multiple transports (and 
> > will, if you don't use BUNDLE).
> 
> In what context? Yes, the generalized definition of an RTP session is the set
> of
> RTP + RTCP packets sent and received over a set of transport receivers and
> transport destination as specified by some type of addressing.
That share SSRC space. It is the SSRC space that is the core of the RTP session.

> 
> However, in a SDP using Offer/Answer if you have two or more media
> descriptions
> that has different UDP ports and not use bundle then you will get multiple RTP
> sessions. 
> 
> Section 9.1 in BUNDLE (
> https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-bundle-negotiation/) is
> explicit about that one BUNDLE group is one RTP session. If you fail to
> establish this bundle group you will have multiple RTP sessions with indepdent
> SSRC spaces. 
> 
> If you put things on the SDP session level then you could jointly configure
> all
> of the created RTP sessions, but they will be multiple RTP sessions. 
> 
 
Cheers

Magnus Westerlund 


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