I've opened 5060 to 5070 udp) too. Nothing has changed : no voice.
I've tried XLite : same thing , no voice.
I've tried to make a call from my Lan where Ser is installed to an user outside and he can hear me but I can't hear him.
If I enstablish a call from an outside user to another outside user .. no voice at all!
I attach X-Lite log for this case:
What can I do now ???
First, you should use module nathelper in your ser. It will help you to fix intranet IP address problem. Second, check if you can send and recieve RTP data in range 2000 - 6000, because in you scenario 200 OK send audio from port 35268 (of course it's a random)
m=audio 35268 RTP/AVP 0 8 3 97 101
^^^^^
Wbr,