[Asterisk-Users] curious bandwidth usage (incoming taking 3x more)

[PC]

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.
>