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CSoft

Asterisk + FreePBX - One-way audio

December 24, 2015 2.7k views
Networking CentOS

Hello!

I use CentOS 6.7 droplet and Asterisk 12.8.2 + FreePBX 12.0.76.2 (I install it according to instructions wiki.freepbx.org/display/FOP/Installing+FreePBX+12+on+CentOS+6.5). Calls are made with the use of sip-trunk from Zadarma.

When the caller dials the extension number and forwarded to an external mobile number, sometimes occurs a one-way audio. The called party cannot hear the caller.

Do you have some experience in dealing with such problems? What do you recommend in this situation?

Thank you!

2 comments
  • typically :) I went into that problem too, my problem the UDP port was QOS from the ISP side,
    i had not enough bandwidth for u(a)law, normal calls, u/alaw need something like 100kb/sec workaround was, I've bought G729 codec ( 35kb/sec) and changed the ISP, no problem at all any-more.

    Check the logs on the server, located at /var/log/asterisk/full, if there isnt anything bad ( i could be a NAT problem too) I would say, not enough bandwidth.

  • My problem was on the side of the voip-provider as it turned out in the end. Thank you! :)

1 Answer

Hey there,

Thank you for reaching out to us!

I'd make sure your endpoint (phone) is configured with NAT enabled if it's behind a router/firewall which it most likely is.

Thank you and please let us know if there is anything else we can do for you.

Happy coding,

Jon Schwenn
Platform Support Specialist
DigitalOcean

  • My problem was on the side of the voip-provider as it turned out in the end. Thank you!

    • Sounds good - if all is well on the SIP provider side one way audio is usually tied to NAT configuration issues.

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