its not going to negotiate until we get the stun responses.  If we are not, you should look if the client is sending them and something is blocking, or why the client is waiting to send them.  Sounds broken on client side from the description.

On Sep 21, 2017, at 7:53 AM, Mirko Brankovic <mirkobrankovic@gmail.com> wrote:

HI,
Has anyone experienced DTLS handshake takes 5s to get to SETUP state:
2017-09-21 11:40:40.021178 [INFO] switch_rtp.c:3515 Changing audio DTLS state from OFF to HANDSHAKE
2017-09-21 11:40:45.319457 [INFO] switch_rtp.c:3172 Changing audio DTLS state from HANDSHAKE to SETUP

In network dump i see that answering side is not sending STUN for this 5s and then suddenly answers last 5 STUNs from A side.

Has anyone encountered this kind of problem ?

I have a pcap if necessary...