An RTCSdpType of "answer" indicates that a description should be treated as an [SDP] final answer, and the offer-answer exchange should be considered complete.
An RTCSdpType of "answer" indicates that a description should be treated as an [SDP] final answer, and the offer-answer exchange should be considered complete. A description used as an SDP answer may be applied as a response to an SDP offer or as an update to a previously sent SDP "pranswer".
An RTCSdpType of "offer" indicates that a description should be treated as an [SDP] offer.
An RTCSdpType of "pranswer" indicates that a description should be treated as an [SDP] answer, but not a final answer.
An RTCSdpType of "pranswer" indicates that a description should be treated as an [SDP] answer, but not a final answer. A description used as an SDP "pranswer" may be applied as a response to a SDP offer, or an update to a previously sent SDP "pranswer".