Create a media content to be answered for the given |sender_options| according to the given session_options.rtcp_mux, session_options.streams, codecs, crypto, and current_streams. If we don't currently have crypto (in current_cryptos) and it is enabled (in secure_policy), crypto is created (according to crypto_suites). The codecs, rtcp_mux, and crypto are all negotiated with the offer. If the neg
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