# server DTLSv1.2 all but SRTP_AEAD_AES_256_GCM
-u
-d
-l ECDHE-RSA-AES256-GCM-SHA384
--srtp SRTP_AES128_CM_SHA1_80:SRTP_AES128_CM_SHA1_32:SRTP_NULL_SHA1_80:SRTP_NULL_SHA1_32:SRTP_AEAD_AES_128_GCM

# client DTLSv1.2 SRTP_AEAD_AES_256_GCM profile
-u
-x
-l ECDHE-RSA-AES256-GCM-SHA384
--srtp SRTP_AEAD_AES_256_GCM