asterisk users - Aug 2005 - Asterisk and Asterisk management portal issue

Everything seems to be working. The admin seems to works, the express 
talk software on my pc works but I can't get my ip phone to make calls. 
They can accept calls but can't make them. my log file only has this error.

Aug 10 12:10:01 DEBUG[4159]: Setting NAT on RTP to 0
Aug 10 12:10:01 DEBUG[4159]: Stopping retransmission on 
'aa8c14f3-871584d9-1c8ecc06@192.168.83.178' of Response 1: Found
Aug 10 12:10:01 DEBUG[4159]: Setting NAT on RTP to 0
Aug 10 12:10:01 NOTICE[4159]: Failed to authenticate user "5247" 
<sip:5247@192.168.83.100>;tag=98B5BBBF-A022EF6C
Aug 10 12:10:01 DEBUG[4159]: Stopping retransmission on 
'aa8c14f3-871584d9-1c8ecc06@192.168.83.178' of Response 2: Found

Both phone have the newest firmware and bootRom. Any help will be 
greatly appreciated.

--Shaun Bolling