Re: VOIP QOS setup Q

On Sun, April 6, 2008 8:35 am, Ben wrote:
> the problem you have is the upstream is only 128.
>
> even with QoS, a 1500 byte packet (MTU 1500) will take around 40ms to get
> through, which means any VoIP packet can suffer up to 40ms delay.
>
> Drop the MTU on your router (and probably everywhere else you can) to
> 576. this will result in slightly more traffic due to the higher
> overhead, but will reduce the delay.

thanks, Ben

it's a basic AAPT bundled Dlink 502T

MTU was 1400, I've now dropped it to 576
MRU is 1492



> XBox live will refuse to work with an MTU that low, I think everything
> else is fine though.

no Xbox, PS3 only

Voytek

> I'm not sure if the D-Link will be acknowledging QoS packets either. I
> have always found the best results for VoIP with Billion modems and
> routers.


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