Iax2 Bandwidth Issues

Hi i got 2 asterisk servers connected by IAX2 (trunk mode) i have monitored with many BW monitor softwares (include my isp monitor web page soft) and get the results:

Interface Received Sent Total
Kbps Kbps Kbps

eth0 250.08 495.76

This mean that always my Outgoing BW it’s higher than the incomming BW.
Does anyone know what could be happend??

[general]
bindport = 4569 ; Port to bind to (IAX is 4569)
bindaddr = 0.0.0.0 ; Address to bind to (all addresses on machine)
disallow=all
allow=g729
;allow=ulaw
;allow=alaw
allow=gsm
mailboxdetail=yes
tos=lowdelay
trunk=yes

[3000]
username=
type=peer
record_out=Adhoc
record_in=Adhoc
qualify=yes
port=4569
notransfer=yes
mailbox=3000@device
host=xxx.xxx.xxx.xxx
disallow=all
context=from-pstn
callerid=iaxin <3000>
allow=g729

Sorry i did not write the software results

Interface Outgoing kbps Incomming kbps
ETH0 407 233

this is always my outgoing bw its a lot