asterisk users - Sep 2003 - outbound IAX calls bog down DSL

Evening,

I've got * asterisk up and running with nufone account for inbound and 
outbound calls from the world...  everything works quite nicely except that I 
noticed last night that when I have a call active from * to nufone, web 
surfing on the network slows to a crawl...  additionally, I have a VPN tunnel 
to another office (using CIPE) and while inter-office (i.e. - SIP to SIP) 
calls are fine, I cannot call from the remote office to the outside world 
(SIP -> CIPE tunnel -> * -> IAX2 -> nufone) - the call goes through,
but it
breaks up and is not inteligible...  now, I realize that there is a LOT of 
overhead in this arrangement but both offices have pretty fast connections 
(cable modem and 1.5meg SDSL) and it seems like there should be enough 
bandwidth to handle one GSM (and iLBC on the IAX leg) encoded call...  It 
just seems like the calls out to nufone are sucking up WAY more bandwidth 
than they should...  sorry for the long post...  any thougts would be greatly 
appreciated.

dave redmore

You may want to look into prioritizing voice packets over "data"
packets.
Until you turn on some kind of traffic shaping dont "burn up your
bandwidth"
while making calls. This means limit your kazaa and other kinds of peer to
peer or wares hoarding. What are the specs on the box you are running
Asterisk on? Run a traceroute and find out what path your packets are taking
to get to us.

If anyone is having issues with NuFone please direct them offlist to
support@nufone.net.

Greg Merriweather
The NuFone Network
G.Merriweather@nufone.net
519-251-8225 x 3000
IM: shido6@msn.com

----- Original Message ----- 
From: <d.redmore@att.net>
To: <asterisk-users@lists.digium.com>
Sent: Friday, September 26, 2003 9:20 PM
Subject: [Asterisk-Users] outbound IAX calls bog down DSL

> Evening,
>
> I've got * asterisk up and running with nufone account for inbound and
> outbound calls from the world...  everything works quite nicely except
that I
> noticed last night that when I have a call active from * to nufone, web
> surfing on the network slows to a crawl...  additionally, I have a VPN
tunnel
> to another office (using CIPE) and while inter-office (i.e. - SIP to SIP)
> calls are fine, I cannot call from the remote office to the outside world
> (SIP -> CIPE tunnel -> * -> IAX2 -> nufone) - the call goes
through, but
it
> breaks up and is not inteligible...  now, I realize that there is a LOT of
> overhead in this arrangement but both offices have pretty fast connections
> (cable modem and 1.5meg SDSL) and it seems like there should be enough
> bandwidth to handle one GSM (and iLBC on the IAX leg) encoded call...  It
> just seems like the calls out to nufone are sucking up WAY more bandwidth
> than they should...  sorry for the long post...  any thougts would be
greatly
> appreciated.
>
> dave redmore
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users

Thanks for the reply Greg...  I sure didn't mean to imply that I thought
this


was an issue with NuFone - I have been extremely happy and excited about the 


service and support.  I'll echo the sentiment I believe bkw expressed -
NUFONE


ROCKS!




That said, I'm just curious why a call would cause other traffic to slow
down


so much...  I'm not running any other internet services (i.e. kazaa) just
web


surfing...  One call over IAX to nufone causes web surfing to slow to the 


point that it is basically unusable while the call is up.  All traffic is 


routed through a box running a 850mhz Duron w/ 128megs and the Asterisk box is 


a dedicated machine running at 166mhz w/ 50megs. All traffic is 


switched/100meg except for the NAT/firewall/DSL modem which is 10meg.  So 


packets from desktop to NuFone have to travel the following path - 


desktop(SIP) -> router -> asterisk(SIP/IAX2) -> router ->
NAT/firewall/DSL


modem -> DSL -> NuFone(IAX2).  If I run KSnuffle on the router I see about


40Kbytes/sec sustained on the eth0 interface that is handling all the traffic 


while the call is up.  The * box and the desktop are on different subnets 


which is why everything has to traverse the router so much.  




thanks,  dave



>You may want to look into prioritizing voice packets over "data"
packets.
>Until you turn on some kind of traffic shaping dont "burn up your
bandwidth"
>while making calls. This means limit your kazaa and other kinds of peer to
>peer or wares hoarding. What are the specs on the box you are running
>Asterisk on? Run a traceroute and find out what path your packets are taking
>to get to us.
>
>If anyone is having issues with NuFone please direct them offlist to
>support@nufone.net.


>Greg Merriweather
>The NuFone Network
>G.Merriweather@nufone.net
>519-251-8225 x 3000
>IM: shido6@msn.com