Voip + Tomato = not resolved issues

Discussion in 'Tomato Firmware' started by zawart, Nov 24, 2009.

  1. zawart

    zawart Addicted to LI Member

    I can't configure properly Qos rule for VOIP. Although it's looks correctly, the voice isn't fluent and clear when I begin at the same time downloading some big file over http or by entering some sites. I'm running 1.25 without mods. Here is what I set:
    On is Voip gateway,
    I will appreciate any help
  2. schweinc

    schweinc Network Guru Member

    70 kbits seems low

    70 kilobits seems very low -- should be in the hundreds if using broadband. your isp should have a speed test link (or www.dslreports/speedtest) and it should be run with QOS off. once you get the max download and upload speeds enter 90% of the upload in the "max bandwidth." lastly, my "highest" category uses 80 - 100%. hope some of that helps. r/ pig
  3. zawart

    zawart Addicted to LI Member

    schweinc, the 70 kbit value is the 90% of the minimum of outbound achieved in several tests using speedtest. I'm using iLBC and G729 - the outcoming voice is ok. It seems to be the problem with inbound voice (ack packets of tcp protocol overcrowded my inbound which is 490kbitps) - I don't know how to manage it. I tried to limit the all ack packets to 15% of my outbound, and increased the ack timeout t o 255, but none of this helped.
  4. Toastman

    Toastman Super Moderator Staff Member Member

    You have to limit other processes, both outgoing and incoming limits are necessary, it's not enough just to give priority to the VOIP.

    For example, a quick glance seems to show you have no outgoing limits on your HTTP. That alone will often cause your VOIP to stutter if you have a lot of web activity, especially with your low bandwidth. As your bandwidth gets lower the more difficult it becomes to get things right. There's very little margin for errors.

    I'd suggest you read through the QOS thread (below) for tips, and towards the end there are some examples you might wish to try. Just adjust in/out bandwidth to suit your own setup. Be sure to note that it is usually necessary to limit incoming data to 66% of max bandwidth for best latency, there are some graphs showing what the effect is on this page:


    There was another thread about VOIP here:

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