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The 4.6.1 policy suggests that errors in the values to addIceCandidate (e.g., mal-formatted SDP), these should be handled by error callbacks. This was discussed on the 5/7 call and the mailing list. The action for this bug is (a) to close on whether we should make this change. (b) If we agree to make this change, we need to scrub the entire API for other potential inconsistencies.
As of the 1 July 2014 version, addIceCandidate() has success and failure callbacks. (Will likely be converted to returning a Promise).