hi, I have a problem, only one side can hear the audio, sometimes is it afected to both sides. i realy don't know what to do anymore.. it just won't work.. can somebody please help me to understand the problem and I hope find a solution? so.. there are 3 wireshark logs attached snom-behind-nat is the snom that i have in the office - (ext 15) it never gets audio server-behined-nat - is the server where the 3cx phone system is installed on and it is behind a second nat.. snom-lan is a snom phone on the lan side of the server. - (ext 16) it gets audio (most times) I tried to make a call form 15 to 16.. in that case either neither gets audio or both phones get audio; when I call ent 15 form ext 16, 16 can hear the audio, but i don't get anything; or nobody gets audio. so i don't understand what's wrong.. i have tried all kinds off diferent setting on the phones and on the pbx, but nothing helped.. could it be the stun or the nat? we are using mikrotik routers rb450g; i can only suspect that the nat changes the port when the packet goes out. but i don't know how to solve that problem. another interesting thing is that the outbound and inbound calls are ok.. we can normaly call out or recieve calls. just the extensions are problematic.. please help.. i'm desperate.. thanx..