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Set the transport (either RTCDtlsTransport or RTCSrtpSdesTransport). Only RTP/RTCP multiplexing is supported if transport is an RTCDtlsTransport. If setTransport() is called when transport.state or rtcpTransport.state is "closed", throw an InvalidStateError exception.
var retval = RTCRtpSender.setTransport(transport);
Sets the transport.
This method does not return a value.