It contains the mac_key, a timestamp and a lifetime.
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Communications are coordinated by the exchange of control messages (called a signaling protocol) over a signaling channel which is provided by unspecified means, but generally by a script in the page via the server, e.g. Although any given DTLS connection will use only one certificate, this attribute allows the caller to provide multiple certificates that support different algorithms.
The final certificate will be selected based on the DTLS handshake, which establishes which certificates are allowed.
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