[Asterisk-Users] SIP Registration Problem

[Asterisk User]

I'm runing A at H beta6 and I have a problem with registration of SIP phone.
I can't find/replicate when exactly its happends but sometimes after server
restart or phone restart one of the phone can't register and I get this in
the server:

Transmitting (no NAT) to 10.1.1.152:5060 <http://10.1.1.152:5060/>:
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 10.1.1.152 <http://10.1.1.152/>
;branch=z9hG4bK4b554363d4497847;received= 10.1.1.152 <http://10.1.1.152/>
From: <sip:230 at 10.1.1.210>;tag=12e8dd0080754148
To: <sip:230 at 10.1.1.210>;tag=as2383b1df
Call-ID: 79528c564efdd328 at 10.1.1.152
CSeq: 100 REGISTER
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Max-Forwards: 70
Contact: < sip:230 at 10.1.1.210>
WWW-Authenticate: Digest realm="asterisk", nonce="54cb5290"
Content-Length: 0

 After a few server restarts and/or phone restarts the phone registers ok.

Any ideas why ?

Thanks
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