1.5 Prerequisites/Preconditions

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To establish a session for this protocol, the whole negotiation for transport (for example, protocol, address, and port), payload (for example, codec, payload type mapping, sampling rate, bit rate, and video resolution) and encryption (for example, protocol, algorithm, and key) parameters has to take place by non-RTP means, such as SIP or SDP. At least one connection path at transport level has to be established, either directly or through a connectivity mechanism such as ICE.