if I use a FreePBX Installation with a simple NAT router (Fritzbox 7490), Freepbx is working fine.
But in our office we have to use a Speedport-Hybrid Router. In this router is a siproxd (SIP ALG). I can’t disable the sipproxd.
If I use the same FreePBX Installation with this router, I got oneway audio. Someone on the phone can hear me, but I can’t hear him.
With Wireshark I can see pakets from the Router (192.168.2.1) to the freepbx (192.168.2.100). But there are no pakets form freepbx to the router (RTP).
Is that a NAT issue ?
With a simple NAT router I can see pakets in both directions.
Please help !