asterisk users - Nov 2005 - curious bandwidth usage (incoming taking 3x more)

While we are in a process of moving our office, we use soft phones which 
connect over WAN/VPN to our Asterisk box in the old office.

We use IAX2 softphones configured to use iLBC.

When we call out using the softphone, the bandwidth usage is at about 3 
KB/s (in and out), quality is fine.

However, when someone calls us, the bandwidth usage is about 10 KB/s (in 
and out), audio quality is also fin.

How can this difference be explained?


It seems to me, that asterisk uses the ulaw codec when it calls our 
softphones, but after trying to play with iax.conf, I don't know how to 
make asterisk to try to negotiate iLBC first, then gsm, and ulaw at the 
very end.

-- 
Tomek
http://wpkg.org
WPKG - software deployment and upgrades with Samba

Try opening up iax.conf and where the softphone's entry is, set 
disallow=all and allow=ilbc

Tomasz Chmielewski wrote:
> While we are in a process of moving our office, we use soft phones 
> which connect over WAN/VPN to our Asterisk box in the old office.
>
> We use IAX2 softphones configured to use iLBC.
>
> When we call out using the softphone, the bandwidth usage is at about 
> 3 KB/s (in and out), quality is fine.
>
> However, when someone calls us, the bandwidth usage is about 10 KB/s 
> (in and out), audio quality is also fin.
>
> How can this difference be explained?
>
>
> It seems to me, that asterisk uses the ulaw codec when it calls our 
> softphones, but after trying to play with iax.conf, I don't know how 
> to make asterisk to try to negotiate iLBC first, then gsm, and ulaw at 
> the very end.
>