One-way audio or not audio at all

• /etc/init.d/iptables stop
• Make sure sip.conf are correctly configured if Asterisk is behind NAT
• Make sure NAT settings are correct (nat=yes)
• Make sure you are using same RTP range as your provider
• While connecting with H.323 client you get no audio or garbled audio and messages like this on Asterisk console: rtp.c:489 ast_rtp_read: Unknown RTP codec 107 received. Try to disable Speex or some other codec on Asterisk or/and client side.
• Make canreinvite = no in device settings
• When no audio in H323 calls, make sure in /etc/asterisk/h323.conf you have binaddr set to your servers real IP address.
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  • Restart Asterisk after that