[LARTC] HTB and VOIP- Choppy voice quality: What am I doing wrong? Desperate!

[Artūras Šlajus]

Dan White wrote:
>     All of the gateways are set up properly, and I can communicate in 
> all directions, and can place calls clearly when the traffic is low. Now 
> here is my problem. When I dump a big file over the fiber link, the 
> voice quality goes down considerably. I hit "cancel" on the file, the 
> quality is back.
Does VoIP set quality automaticaly by latency or traffic capabilities?

> Here is what I know about the Inter-Tel VOIP box we 
> use: it uses UDP streams on ports 5000-5018 and 16384 @ 8-18k per side, 
> per call, over 7 possible channels. Each site has 7 channels, which are 
> rarely all in use. So, the total bandwidth should be, at max (18k x 2 
> directions x 7 channels) is 252k I came in on Saturday alone, and was 
> able to kill the quality with one call, and one 1gb file in transit. I 
> have set HTB up as follows:
>  
>            ( 1: )
>  (1:1)             (1:2)
> (1:10)       (1:11)(1:12)
>  
> Here is my script, it is the same at all 3 sites 
> http://208.45.203.97/script.txt
You have many u32 filters. It's not an issue, but i usualy get with fw and
marking packets in iptables. That would make script much easier to read.
Example follows:
# $IPT -t mangle -A FORWARD -s $LAN_NET -d $ADDR -i $LAN -o $PARABOLE -j MARK --set-mark 20
# tc filter add dev $LAN protocol ip parent 1:0 prio 1 handle 20 fw flowid 1:20

> (I would post it, but it is pretty 
> long). As you can see I have given 80mbit to the phones (remember, they 
> should only need 252k!), 16mbit to default, and cut windows file sharing 
> back to 1mbit, but I still have voice issues during file transfers! I 
> know the filters are catching the traffic (I did "tc -s -d class show 
> dev eth1" and watched my numbers while calling, and transferring files, 
> and the incremented properly).
Well, did you try assigning priorities of sending? There should be something
as prio (cosult HTB manual). If real, i don't know "The Real Solution", I'm
just trying to help :) I had no expierence with VoIP.