The invention discloses a media steam transmission address negotiating method, transmitting a message containing session description protocol (SDP) information by first equipment to second equipment, respectively appointing corresponding transmission addresses in the SDP information in accordance with partial or all coding-decoding formats the first equipment desire to build; the second equipment obtains various coding-decoding formats of the media flow desired and corresponding transmission addresses from the SDP information in the received message, determines a desired coding-decoding format and returns a response message containing the desired coding-decoding format and corresponding transmission address. |