Extract actual keys - Decrypt SRTP traffic

edit

Hi,

I am trying to decrypt SRTP traffic from a WebRTC call. I captured keys using SSLKEYLOG and opened .pcap file in Wireshark. But, i found fingerprint only in SDP and it indicates that the key is exchanged/exported from DTLS. But, I wasn't able to find actual keys used in DTLS-SRTP. Can any one help me how to extract the actual keys? Thank you.

Best Regards, Chandramouli.