Transport parameters returned to a client so it can create a matching client-side transport and connect it (server → client handshake payload).
DTLS parameters (role and fingerprints).
Server-gathered ICE candidates.
ICE parameters (ufrag/pwd) for the transport.
Server-side transport id.
Optional
SCTP parameters, present only when SCTP/data channels are enabled.
Transport parameters returned to a client so it can create a matching client-side transport and connect it (server → client handshake payload).