OptionalcandidateICE candidate line for a candidate message.
OptionalcapabilitiesOptional capability tokens the sender supports, echoed by a peer that supports them too.
Additive and ignored by any peer that does not know a token, which is what
makes a capability safe to introduce: an older peer never echoes, so the
feature simply stays off rather than breaking the connection. Currently only
a11-pmtud/1 (path MTU probing).
OptionaldescriptionSDP text for a description message.
OptionaldescriptionSDP description subtype, such as offer or answer.
OptionalerrorNon-OK A11 status for an error message.
OptionalmidMedia/data-channel id associated with an ICE candidate.
OptionalrecipientIdentity of the peer that should consume the message.
OptionalsenderIdentity of the peer that emitted the message.
OptionaltypeControl-message kind.
Fields used to construct a SignallingMessage.