[Freeswitch-users] Calls between extensions with no audio on NAT

Hello, I'm having a problem with a NAT scenario, I have some pcs (192.168.10.102 and 192.168.10.103) using verto behind a NAT calling to a LAN FS (192.168.10.143). I added a gateway and the callout is working good enough, but the calls between extensions I am not getting audio, I just get the "No audio stun for a long time!". I set in many ways the following: <param name="ext-rtp-ip" value="192.168.30.143"/> <param name="ext-sip-ip" value="auto"/> I tried auto, auto-nat, $${external_rtp_ip} and $${external_sip_ip} respectively, and that one I just added with no luck. What can be the problem with this? Thanks Jose