The srtpCipher property of the RTCTransportStats dictionary indicates the descriptive name of the protection profile used for the Secure Real-time Transport Protocol (SRTP) transport.
A string that indicates the descriptive name of the SRTP protection profile.
Values are defined in the "Profile" column of the IANA DTLS-SRTP protection profile registry and RFC 5764, section 4.1.2.
"SRTP_AES128_CM_HMAC_SHA1_80" is the descriptive name of the following profile, where maximum_lifetime is the maximum number of packets that can be protected by a single set of keys.
SRTP_AES128_CM_HMAC_SHA1_80 cipher: AES_128_CM cipher_key_length: 128 cipher_salt_length: 112 maximum_lifetime: 2^31 auth_function: HMAC-SHA1 auth_key_length: 160 auth_tag_length: 80