I turned trace off once SRTP started working.  But then turned right back on, after my last post, so I could work on enabling TLS with self signed certs for key negotiation.BTW, I had hoped to use DTLS (RFC 5764) for encrypting the key negotiation.  ...

SRTP-RTP interworking is now working properly in my lab setup.  I had to make these changes to my "voice service voip" section in both CUBEs:!voice service voipno srtp fallsipno pass-thru headers unsuppno pass-thru content sdp mode non-rtpno pass-thr...

Yeah, sorry.  The SRTP command was in those dial peers during an earlier attempt.  I temporarily removed that setting during one of my many test runs, and forgot to put it back in for my initial post here.  An updated copy of the dial peer settings, ...

Thanks Jonathon and Roger.I removed the "pass-thru content sdp" commands from all of the dial-peers.  (Those lines were inserted while troubleshooting, based on comments in other community posts.)  The SRTP command has also been added back to the rel...