[Asterisk-Users] outbound IAX calls bog down DSL

[d.redmore at att.net]

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