xlite phone registration

[rudy73]

hi

I'm use a Asterisk box under Fedora with hard phone in a LAN(work well)
and I want to make call with a xlite phone under windows xp.
I have a problem of xlite registration :
JB/JB 84.98.32.237 D 255.255.255.255 5074 Unmonitored

Xlite register with a net provider adress, all phone and asterisk box are in the same lan.

my sip configuration seem well :
sip.conf
[JB] ; X-lite client
type=friend
username = JB
host=dynamic
defaultip = 192.168.2.192
port = 5060
dtmfmode=inband
nat = no
qualify = no
disallow=all
allow=ulaw
allow=alaw
allow=gsm
context=local

someone have an idea?
rudy73