[Freeswitch-users] Preferred Crypto for outbound calls

Hello, How do I set my preferred crypto suite to be used for SRTP outbound call ? I am running FS 1.4.18. In old version of FS(1.2.3), I could do that using sip_secure_media=AES_CM_128_HMAC_SHA1_80. But this variable doesn't exist anymore, by the looks of it. Regards Prashanth