Re: [MMUSIC] WGLC of last set of changes to Bundle (draft-ietf-mmusic-sdp-bundle-negotiation-22) - Magnus' comments
Christer Holmberg <christer.holmberg@ericsson.com> Mon, 13 July 2015 10:36 UTC
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Magnus Westerlund <magnus.westerlund@ericsson.com>, mmusic <mmusic@ietf.org>
Thread-Topic: [MMUSIC] WGLC of last set of changes to Bundle (draft-ietf-mmusic-sdp-bundle-negotiation-22) - Magnus' comments
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Date: Mon, 13 Jul 2015 10:34:02 +0000
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Subject: Re: [MMUSIC] WGLC of last set of changes to Bundle (draft-ietf-mmusic-sdp-bundle-negotiation-22) - Magnus' comments
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Hi, In order to address the issue raised by Magnus, I suggest the following modification: OLD: 10.3.1. General When a BUNDLE group, which contains RTP based media, is created, the offerer and answerer MUST negotiate whether to enable RTP/RTCP multiplexing for the RTP based media associated with the BUNDLE group [RFC5761]. If RTP/RTCP multiplexing is enabled, the same address:port combination will be used for receiving (and sending) all RTP packets and the RTCP packets associated with the BUNDLE group. Each endpoint will send the packets towards the BUNDLE address of the other endpoint. If RTP/RTCP multiplexing is not enabled, separate address:port combinations will be used for receiving (and sending) the RTP packets and the RTCP packets. If the remote endpoint has associated an SDP 'rtcp' attribute with the "m=" line associated with the BUNDLE-tag, the attribute value will be used for sending all RTCP packets associated with the BUNDLE group towards that endpoint. NEW: 10.3.1. General When a BUNDLE group, which contains RTP based media, is created, the offerer and answerer MUST negotiate whether to enable RTP/RTCP multiplexing for the RTP based media associated with the BUNDLE group [RFC5761]. If RTP/RTCP multiplexing is enabled, the same address:port combination will be used for sending all RTP packets and the RTCP packets associated with the BUNDLE group. Each endpoint will send the packets towards the BUNDLE address of the other endpoint. The same address:port combination MAY be used for receiving RTP packets and RTCP packets. If RTP/RTCP multiplexing is not enabled, separate address:port combinations will be used for sending the RTP packets and the RTCP packets. The same address:port combinations MAY be used for receiving RTP packets and RTCP packets. If the remote endpoint has associated an SDP 'rtcp' attribute with the "m=" line associated with the BUNDLE-tag, the attribute value will be used for sending all RTCP packets associated with the BUNDLE group towards that endpoint. Regards, Christer From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Christer Holmberg Sent: 25. kesäkuuta 2015 8:19 To: Magnus Westerlund; mmusic Cc: draft-ietf-mmusic-sdp-bundle-negotiation@tools.ietf.org Subject: Re: [MMUSIC] WGLC of last set of changes to Bundle (draft-ietf-mmusic-sdp-bundle-negotiation-22) Hi Magnus, Thanks for your comment! Regarding RTP/RTCP mux, I guess it should be clarified that one uses single address:ports for sending and receiving RTP and RTCP, but that those address:ports don't have to be the same. I'll think of some wording. Regards, Christer Sent from my Windows Phone ________________________________ From: Magnus Westerlund<mailto:magnus.westerlund@ericsson.com> Sent: 23/06/2015 10:14 To: mmusic<mailto:mmusic@ietf.org> Cc: draft-ietf-mmusic-sdp-bundle-negotiation@tools.ietf.org<mailto:draft-ietf-mmusic-sdp-bundle-negotiation@tools.ietf.org> Subject: Re: [MMUSIC] WGLC of last set of changes to Bundle (draft-ietf-mmusic-sdp-bundle-negotiation-22) Hi, I looked at the changes and wonder if I spotted an inconsistency? Otherwise things looks good. In Section 5 text was changed to enable non-symmetric RTP usages. Resulting in the following text: The address:port combination used for sending bundled media MAY be the same as the BUNDLE address, used to receive bundled media, depending on whether symmetric RTP [RFC4961] is used. From 10.3.1: If RTP/RTCP multiplexing is enabled, the same address:port combination will be used for receiving (and sending) all RTP packets and the RTCP packets associated with the BUNDLE group. Each endpoint will send the packets towards the BUNDLE address of the other endpoint. This appears to strongly suggest that one should/must use symmetric RTP when doing RTP/RTCP muxing. However, I find nothing in RFC 5761 that mandates usage of symmetric RTP with RTP/RTCP Mux, even if it the text is written with that as an assumption, I find nothing that prevents non-symmetric sending. Thus, I wonder if the text in 10.3.1 needs to be updated to avoid this issue. Cheers Magnus Westerlund ---------------------------------------------------------------------- Services, Media and Network features, Ericsson Research EAB/TXM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com<mailto:magnus.westerlund@ericsson.com> ---------------------------------------------------------------------- _______________________________________________ mmusic mailing list mmusic@ietf.org<mailto:mmusic@ietf.org> https://www.ietf.org/mailman/listinfo/mmusic
- Re: [MMUSIC] WGLC of last set of changes to Bundl… Christer Holmberg
- Re: [MMUSIC] WGLC of last set of changes to Bundl… Magnus Westerlund
- Re: [MMUSIC] WGLC of last set of changes to Bundl… Christer Holmberg
- Re: [MMUSIC] WGLC of last set of changes to Bundl… Flemming Andreasen