Re: [Sipping] Re: I-D ACTION:draft-bryan-sipping-midi-01.txt
Cullen Jennings <fluffy@cisco.com> Fri, 13 July 2007 01:49 UTC
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From: Cullen Jennings <fluffy@cisco.com>
Subject: Re: [Sipping] Re: I-D ACTION:draft-bryan-sipping-midi-01.txt
Date: Thu, 12 Jul 2007 18:48:34 -0700
To: Eric Burger <eburger@bea.com>
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Cc: David Bryan <dbryan@sipeerior.com>, sipping <sipping@ietf.org>
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A few people wanted to discuss some part of this draft and did not want it to be in the dead state - I said, sure, I will will resurrect. I have not asked for any agenda time on this - if someone wants to do something with it, it is here, I don't plan to put much time into it. My primary motivation for the draft is the XML that specifies the variations in tones that are needed. It highlights the fact that a simple model that specified a handful or two of parameters could generate all the tones described here. On Jun 17, 2007, at 4:51 AM, Eric Burger wrote: > Could we get the double-super-secret motivation for resubmitting > the draft? > > Is it for the originally stated purpose, to render standard ring- > tones via > specification as MIDI files (because 3GPP supports MIDI?)? If so, > there are > probably better ways of doing this than in MIDI. Most of the > draft is (I > think, incorrect) ways to hack MIDI to generate tones that are > almost the > real tones. > > Is it to support custom ring-tones? If so, I could really get on > board. > > I am not going to spend cycles on the draft unless I know what the > motivations are. Knowing the motivations will dramatically alter the > direction I think the draft should go. > > I do have an opinion on specifying the something in the INVITE > instead of as > early media. Early media is bad and evil and hard and very easy to > have > weird stuff happen. That should be enough, but for those who count > every > byte, transporting a small set of MIDI events over RTP instead of > sending a > Standard MIDI File means one has to pay the RTP and packet tax. > Thus, I > have no problem suggesting that one should NOT use RTP and early > media for > such purposes. > > I would also draw folks attention to: > draft-kosonen-sp-midi-mediatype > > > On 6/15/07 4:27 PM, "Cullen Jennings" <fluffy@cisco.com> wrote: > >> >> On Jun 8, 2007, at 7:27 AM, Colin Perkins wrote: >> >>> On 4 Jun 2007, at 20:50, Internet-Drafts@ietf.org wrote: >>>> A New Internet-Draft is available from the on-line Internet-Drafts >>>> directories. >>>> >>>> >>>> Title : Telephony Tones Using MIDI in SIP >>>> Author(s) : C. Jennings, D. Bryan >>>> Filename : draft-bryan-sipping-midi-01.txt >>>> Pages : 68 >>>> Date : 2007-6-4 >>>> >>>> This document describes conventions for using MIDI to generate >>>> tones >>>> on SIP UAs. This does not define any changes to SIP but >>>> describes >>>> how to use the existing Alert-Info header to play tones that >>>> can be >>>> used to indicate specialized PSTN tones such as the ringback >>>> tones >>>> from various countries. The tones are described using MIDI >>>> which >>>> results in a compact representation that is simple for a UA to >>>> generate and easy to render into audio. >>>> >>>> This work is being discussed on the sipping@ietf.org mailing >>>> list. >>>> This draft was revived at request of a few people so it could be >>>> discussed. Parts of it need to be updated since it was >>>> written in >>>> 2003. >>>> >>>> A URL for this Internet-Draft is: >>>> http://www.ietf.org/internet-drafts/draft-bryan-sipping-midi-01.txt >>> >>> Interesting draft. A couple of comments: >> >> Interesting is fair :-) David and I just resubmitted this based on a >> request of a few people want to have a current version to talk about. >> >>> >>> How would this compare to sending audio/tone [RFC 4733 section >>> 4.3.3] data in SIP? (I realise the audio/tone format is currently >>> only defined for transport via RTP, but it could easily be extended >>> for this use, and is simpler than MIDI). >> >> Uh, this is likely larger, and far more complicated to implement for >> the receiver. I like the idea of using tones. >> >>> >>> Also, one could presumably achieve a similar effect using early >>> media with either the RFC 4733 or RFC 4695 RTP payload formats. >>> Some discussion of the trade-off between the approaches would be >>> valuable. >> >> If we did go forward with something based on midi, it would need to >> be brought inline with 4695 but totally agree with you, the pro' s >> and con's of doing this in SIP signaling vs. what we have now where >> it is done in RTP with early media would need to be discussed. >> Including the interaction with HERFP. >> >>> >>> -- >>> Colin Perkins >>> http://csperkins.org/ >> >> >> _______________________________________________ >> Sipping mailing list https://www1.ietf.org/mailman/listinfo/sipping >> This list is for NEW development of the application of SIP >> Use sip-implementors@cs.columbia.edu for questions on current sip >> Use sip@ietf.org for new developments of core SIP > > > Notice: This email message, together with any attachments, may > contain information of BEA Systems, Inc., its subsidiaries > and affiliated entities, that may be confidential, proprietary, > copyrighted and/or legally privileged, and is intended solely for > the use of the individual or entity named in this message. If you > are not the intended recipient, and have received this message in > error, please immediately return this by email and then delete it. _______________________________________________ Sipping mailing list https://www1.ietf.org/mailman/listinfo/sipping This list is for NEW development of the application of SIP Use sip-implementors@cs.columbia.edu for questions on current sip Use sip@ietf.org for new developments of core SIP
- [Sipping] Re: I-D ACTION:draft-bryan-sipping-midi… Colin Perkins
- [Sipping] Re: draft-camarillo-sip-body-handling-0… Paul Kyzivat
- [Sipping] Re: draft-camarillo-sip-body-handling-0… Cullen Jennings
- [Sipping] Re: I-D ACTION:draft-bryan-sipping-midi… Cullen Jennings
- Re: [Sipping] Re: I-D ACTION:draft-bryan-sipping-… Eric Burger
- Re: [Sipping] Re: I-D ACTION:draft-bryan-sipping-… Cullen Jennings