1. The caller offers an SDES-SRTP-encrypted connection with ICE.

2. FS offers to the callee a simple RTP connection (no SRTP, no ICE, as configured in the dialplan), callee answers respectively.

3. FS answers caller, but without with neither "a:crypto" entries nor ICE candidates.

4. Why is that?  Shouldn't it answer SDES-SRTP with ICE to the original caller, respecting the original caller's offer?

When doing WebRTC from the caller (DTLS-SRTP with ICE), this actually works fine (callee unchanged).

So what's the general scheme for choosing encryption on either side?

Related to that:

Can you enable ICE without completely enabling WebRTC (media_webrtc=true) from the dialplan? That would help maybe...

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