asterisk users - May 2005 - problem with H323:Gatekeeper could not find user

Hi
I've an Openh323 gatekeeper and on the same pc phonejack PCI card and
Ohphone.
The Gatekeeper is registrered with Asterisk
The Ohphone is registered with gatekeeper when i do the following command:
ohphone -g IP -q /dev/phone0 --callerid phonejack -l
The analog phone connected to phonejack get dial tone
The problem is:
when i call with sip phone the h323 client I've this message
H.323 call 'ip$localhost/19931' cleared reson 11 (gatekeeper could not
find
user)
in extensions.conf :
  exten=>5552,1,Dial(OH323/phonejack)

Thanks Ale