Register failed (403 Forbidden) on brekeke

1. Brekeke Product Name and version:
brekeke pbx V.2.0.5.8
2. Java version:
1.2.4
3. OS type and the version:
windows 2000 pro
4. UA (phone), gateway or other hardware/software involved:
x-lite , firewall pix-515E
5. Select your network pattern from http://www.brekeke-sip.com/bbs/network/ ... terns.html :

6. Your problem:

Register failed (403 Forbidden) on brekeke

Are you using the authentication for REGISTER?
if so, check the username and password again.

no i did not use authentication and my sip account is correct
and i had checked them and still have the same error
error 403