Baseline Widely available
The state property of the RTCIceCandidatePairStats dictionary indicates the state of the checklist of which the candidate pair is a member.
A string whose value is one of the following:
failed
A check for this pair has been performed but failed. A failure can occur either because no response was received or because the response indicated that an unrecoverable error occurred.
frozen
No check has been performed yet for this candidate pair, and performing the check is blocked until another check is successful. Once that check has succeeded, this pair will unfreeze and move into the waiting state.
in-progress
A check has been initiated for this pair, but the check's transaction is still in progress.
succeeded
A check for this pair has been completed successfully.
waiting
This pair has not yet been checked, but the check can be performed as soon as this pair is the highest priority pair remaining in the waiting state.
During ICE negotiation, the ICE layer builds up a checklist, which is a list of potential pairings of ICE candidates. Each pair has a state, represented by a string literal.
When a candidate pair is added to the checklist, it begins in the frozen state. As soon as there are no checks ongoing that block the pair from being analyzed, it is unfrozen and moves into the waiting state. This may happen immediately upon being added to the checklist.
Each time a candidate pair is checked, the next-highest priority candidate pair remaining on the checklist moves from the waiting state to the in-progress state, and its check begins. If the check fails for any reason, the pair moves into its final state, failed. If the check succeeds, the pair ends up in the succeeded state. The ICE checklist state for any given pair of ICE candidates can be found in the corresponding state property.
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