Hello, I have a problem with no audio for outbond call using 3cx client. I can hear receiver talk to me but they cannot hear me, i have to hang up and redial 2-3 times or did not hang up the phone call and wait for about 30-40 second phone call start to be normal. On same network, using yealink phone we have no problem at all because at phone ip settings i set our public ip (3cx server ip) instead our FQDN. Back to 3cx client, I try to change FQDN to public ip on STUN server settings and Voila! it goes normal. However, everytime 3cx client restarted the settings goes back to FQDN. My question is, how to permanently change it on 3cx clients? Thank you in advance.