Re: QOS, VOIP, Debian, Ultrasparc 1
On Sat, Oct 07, 2006 at 08:57:51PM -0500, John Zbesko wrote:
> I hope someone can point me in the right direction.
>
> I have Vonage telephone service through a provided Linksys WRTP54G
> router. The router is connected to an Ultrasparc 1 debian server by way
> of a Netgear gigabit switch. The server is connected to a RCA cable
> modem to Comcast. Between the cable modem and server is 10Mb ethernet;
> between server and router is 100Mb.
>
> My family is complaining about delays in establishing phone calls. We
> call and there is a delay before the other person hears us. Once the
> conversation starts, however, everything sounds fine.
I have experienced some issue when connecting VOIP to PSTN.
This behaviour is almost always caused by important jitter on the line.
Try to do a ping a look at the average round-trip.
Then look at the value that are quite outside the mean time.
Look at how often they occurs and how big they are.
I had around 40ms round-trip with jitter up to 3300ms.
This cause echo on the line, delays and slow start - peers doesn't hear
you the first 10 secondS.
All are caused by a poor quality Internet connexion.
> Do I have a QOS issue? I'm running a 2.4 kernel with Firestarter on the
> server. Is there a specific package I should install for QOS? Any
> advice, tips, etc.?
You can try to use the tos parameter. set it with iptables.
>
> Is this a router issue? Should I attempt to re-program the Linksys
> router? (I've read howto's on the net.)
Maybe
> [snip]
I'm not vonage customer so I can't say.
Sometimes carriers sell you an option called fast-ping that lower the
round-trip (useful for online gaming). This one helps a lot.
My two cents.
Seb
Reply to: