The dtlsCipher property of the RTCTransportStats dictionary is a string that indicates the descriptive name of the cipher suite used for the DTLS transport.
Allowed names are defined in the "Description" column of the TLS Cipher Suites section in the IANA cipher suite registry. For example "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256".
A string indicating the name of the DTLS cipher.