clue signalling n.
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CLUE Signalling. IETF 89 Robert Hansen. Signalling -07 revision. Changes not as substantial as diff to -06 would suggest Moved protocols/data channel text to appendix Relevant to draft- holmberg -clue- datachannel and draft- presta -clue-protocol Removed most discussion of pros/cons

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clue signalling

CLUE Signalling


Robert Hansen

signalling 07 revision
Signalling -07 revision
  • Changes not as substantial as diff to -06 would suggest
  • Moved protocols/data channel text to appendix
    • Relevant to draft-holmberg-clue-datachannel and draft-presta-clue-protocol
  • Removed most discussion of pros/cons
  • Added normative text for establishing calls with/without CLUE
clue controlled m lines
CLUE-controlled m-lines
  • Makes use of the grouping framework, with new “CLUE” semantic
  • MIDs of CLUE-controlled m-lines included in the same group as CLUE channel
  • CLUE m-lines also include a label attribute, used to reference them in CLUE protocol messages
  • Media must not be sent from these m-lines until negotiated via CLUE
establishing clue
Establishing CLUE
  • Recommends that initially no CLUE m-lines except data-channel
    • Implementations in CLUE-only environments may choose to disregard this
  • Once data channel negotiated can add CLUE-controlled m-lines via new offers
  • CLUE protocol used to negotiate what captures to send
non clue data channels
Non-CLUE data channels
  • Recommend that any non-CLUE m-lines that share a media type with a CLUE-controlled m-line are disabled via SDP O/A once CLUE media starts
  • Not mandatory, as there may later be uses for mixed CLUE/non-CLUE media
changing clue status mid call
Changing CLUE status mid-call
  • Ongoing call goes from non-CLUE to CLUE if mid-call O/A means both sides negotiate CLUE data channel support
  • If in a CLUE call either side removes support for the data channel in their SDP the call is no longer CLUE enabled, media on all CLUE-controlled m-lines must stop
    • This is distinct from signalling failure of the data channel, where the call remains CLUE-enabled