Why does 3cx delete crypto from SDP

[Martin_Thomas_HPA]

System Version: 16.0.4.493

Hello,
i try to activate srtp (not TLS) for internal calls. But 3cx allways delete the crypto sdp. What ist the reason?
the issue is only on internal calls. If i make a call from a srtp enabled STUN Phone to an internal, encryption is ok.
I have tried also SRTP + TLS but no change, same issue....

 

[Benedikt Machens]

Hey,

the media description of the SDP is RTP/AVP
The correct description is RTP/SAVP for encrypted audio

So maybe thats why the 3CX deletes the crypto

 

[Martin_Thomas_HPA]

Ok. And how can i fix this, On the Fanvil Phone i can only enable or disable srtp....