One-way audio or not audio at all
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- Make sure NAT settings are correct
- 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.