What ports must I open on the firewall to enable audio in zoiper?

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1

When freepbx is on DMZ everything is OK.
But I want to it be more secure, so I want to open only the ports needed.
I opened these ports but no luck. Zoiper registers but I have no audio during a call

eth0 0.0.0.0/0 5060 TCP ACCEPT
eth0 0.0.0.0/0 4569 UDP ACCEPT
eth0 0.0.0.0/0 8000 UDP ACCEPT
eth0 0.0.0.0/0 3478 UDP ACCEPT
eth0 0.0.0.0/0 3478 TCP ACCEPT

Which are the correct ports to open?

2

https://wiki.freepbx.org/display/PPS/Ports+used+on+your+PBX