I have been trying to get SRTP media encryption to work on my SIP trunk connecting my Avaya Aura CM 6.0 to an ACME Packet Session Boarder Controller (SBC) managed by another agency. They configured the connection on the SBC red side as transparent to allow the CM to do the encryption. I've set my system-parameters customer-options page 4 Media Encryption Over IP to Y, IP Trunks to Y, system-parameters features page 19 Direct IP-IP Audio Connections to Y, SDP Capability Negotiation for SRTP to Y, my ip-codec-sets using G.711, G.711MU Media Encryption to 1: 1-srtp-aescm128-hmac80, 2: 2-srtp-aescm128-hmac32, 3: none. I can see my test calls seize the SIP trunk member, and hear ringing from the other end, the other end hears the rings, but when pickup no audio. Call traces show the calls going out and being received at the other end. Is there anything else I should be looking for. This is my first time doing this so any guidance would help. Thank you.