Re: [sipcore] Reviewers needed for new music-on-hold technique
"Elwell, John" <john.elwell@siemens-enterprise.com> Mon, 22 August 2011 06:24 UTC
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From: "Elwell, John" <john.elwell@siemens-enterprise.com>
To: "Worley, Dale R (Dale)" <dworley@avaya.com>, "sipcore@ietf.org" <sipcore@ietf.org>
Date: Mon, 22 Aug 2011 08:25:51 +0200
Thread-Topic: Reviewers needed for new music-on-hold technique
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Subject: Re: [sipcore] Reviewers needed for new music-on-hold technique
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Dale, Yes, this text addresses my concerns. John > -----Original Message----- > From: Worley, Dale R (Dale) [mailto:dworley@avaya.com] > Sent: 19 August 2011 20:49 > To: Elwell, John; sipcore@ietf.org > Subject: RE: Reviewers needed for new music-on-hold technique > > How about adding these sections to the end of section 2? > > > When the Media Stream Directionality is "inactive" > > The directionality of the media stream in the SDP offer in an INVITE > or re-INVITE to the music source can be "inactive" if the SDP offer > from the remote UA was "sendonly" or "inactive". Generally, this > happens when the remote UA also has put the call on hold and provided > a directionality of "sendonly". In this situation, the executing UA > can omit establishing the dialog with the music source (or can > terminate the existing dialog with the music source). > > If the executing UA uses this optimization, it creates the SDP answer > itself, with directionality "inactive" and using its own RTP/RTCP > ports, and returns that answer to the remote UA. > > The executing UA must be prepared for the remote UA to send a > re-INVITE with directionality "active" or "recvonly", in which case > the executing UA must initiate a dialog with the music source, as > described above. > > Multiple Media Streams > > There may be multiple media streams (multiple m= lines) in any of the > the SDPs involved in the dialogs. As the SDPs are manipulated, each > media description (each starting with an m= line) is manipulated as > described above for a single media stream. But there are some > elaborations that the executing UA may implement to achieve specific > effects. > > If the executing UA desires to present only certain media types as > on-hold media, when passing the offer SDP through, it can reject any > particular media streams by setting the port number in the m= line to > zero.[offer-answer] This ensures that the answer SDP will also have a > rejection for that m= line. > > If the executing UA wishes to provide its own on-hold media for a > particular m= line, it can do so by providing the answer information > for that m= line. The executing UA may decide to do this when the > offer SDP is received (by modifying the m= line to rejected state when > sending it to the music source), or upon receiving the answer from the > music source and discovering that the m= line has been rejected. > > The executing UA may not want to pass a rejected m= line from the > music source to the remote UA (when the remote UA provided a > non-rejected m= line), and instead provide an answer with > directionality "inactive" (and specifying its own RTP/RTCP ports). > > > Dale >
- [sipcore] Reviewers needed for new music-on-hold … Worley, Dale R (Dale)
- Re: [sipcore] Reviewers needed for new music-on-h… Paul Kyzivat
- Re: [sipcore] Reviewers needed for new music-on-h… Worley, Dale R (Dale)
- Re: [sipcore] Reviewers needed for new music-on-h… Worley, Dale R (Dale)
- Re: [sipcore] Reviewers needed for new music-on-h… Paul Kyzivat
- Re: [sipcore] Reviewers needed for new music-on-h… Elwell, John
- Re: [sipcore] Reviewers needed for new music-on-h… Worley, Dale R (Dale)
- [sipcore] Reviewers needed for new music-on-hold … Worley, Dale R (Dale)
- Re: [sipcore] Reviewers needed for new music-on-h… Elwell, John
- Re: [sipcore] Reviewers needed for new music-on-h… Worley, Dale R (Dale)
- Re: [sipcore] Reviewers needed for new music-on-h… Elwell, John
- Re: [sipcore] Reviewers needed for new music-on-h… Worley, Dale R (Dale)
- Re: [sipcore] Reviewers needed for new music-on-h… Elwell, John