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CLUE I nformation S ignaling C riteria

CLUE I nformation S ignaling C riteria. Christer Holmberg CLUE Interim Stockholm June 7-8th, 2012. PURPOSE. Define signaling criteria, in order to determine what transport mechanims is most suitable for transporting CLUE related information*.

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CLUE I nformation S ignaling C riteria

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  1. CLUE Information Signaling Criteria Christer Holmberg CLUE Interim Stockholm June 7-8th, 2012

  2. PURPOSE • Define signaling criteria, in order to determine what transport mechanims is most suitable for transporting CLUE related information*. • * We need to make sure we have a common understanding about what information we are talking about. • Non-CLUE specific information will be transported using existing mechanisms (SIP, SDP).

  3. CRITERIA PROPOSALS (1/2) • Whether signaling intermediaries (e.g. SBGs) need to have access to the information • The expected size of the information to be sent • The expected frequency of the information to be sent • Whether the information is sent during session establishment, mid- session and/or session termination. • Whether the transport of the information is delay sensitive • Whether the information is sent as a notification, or whether some kind of response is needed • Whether the information needs to be delivered reliably (either using a reliable transport mechanism, and/or some kind of higher-level acknowledgement) • Whether the information is needed by a non-CLUE entity in order to participate in a CLUE conference

  4. CRITERIA PROPOSALS (2/2) • Whether the CLUE information and the media description (SDP) need to be in the same message. • Whether the CLUE information and the media description (SDP) need to use the same transport path. • Whether the CLUE information is using one transport (e.g. encoding group and MC are using the same transport / message) • When one says transport, I think of the question of TCP v. UDP v. SCTP? • Is it bundled into SDP or some other package/MIME type? • Is it carried by SIP and thus have the same route set, or does it use some other signal type with its own route set? • Separately, assuming SIP, does it use INVITES or some other message type to carry? must the exchange be coincident with: • - SDP media capability discovery (SDP and CLUE exchanges are independent • and in stages) • - SIP session establishment (could CLUE be setup up before or after the SIP session). (determine endpoint patterns and select media type later, i.e. pre-configured with/without SDP)

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