[Freeswitch-users] Since recently no ring back

Hello Freeswitch Users, Since recently I am not getting ring back singles for some phones that do inbound calls. Voice connection is working in both direction when the call is established. When someone calls where the ring back is not working then there is only a short beep and then silence until someone answers the phone. <action application="set" data="ringback=${de-ring}"/> <action application="ring_ready" /> <action application="bridge" data="user/18"/> Without bridge is is working. <action application="ring_ready" /> <action application="sleep" data="6000"/> <action application="answer"/> <action application="playback" data="$${hold_music}"/> Freeswitch sits behinde nat. Fresswitch Version 1.8.2 Best regards, Paul.