Asterisk 1.8.11.1 realtime spa3102 not registering - Help!

Hi,
i’m facing a strange situation and as newbie i’m kindly asking for help.
I had asterisk 1.6 with freepbx and a spa3102 woking as the pstn gateway.
Now i got a new environment, with Asterisk 1.8.11.1 realtime (all configs are stored in the mysql database), and i’m not being able to make spa3102 work.
The configurations of the spa3102 are the same i had in my previous environment, but it does not register.

The sip debug shows the following:

[code]<— SIP read from UDP:192.168.80.30:5061 —>
REGISTER sip:192.168.80.1 SIP/2.0
Via: SIP/2.0/UDP 192.168.80.30:5061;branch=z9hG4bK-b84734c9
From: Unknown Caller sip:spa3102@192.168.80.1;tag=daea7b1299b5a3a8o1
To: Unknown Caller sip:spa3102@192.168.80.1
Call-ID: 59e95fec-ea4373df@192.168.80.30
CSeq: 47241 REGISTER
Max-Forwards: 70
Contact: Unknown Caller sip:spa3102@192.168.80.30:5061;expires=300
User-Agent: Linksys/SPA3102-5.1.7(GW)
Content-Length: 0
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER
Supported: x-sipura, replaces

<------------->
— (12 headers 0 lines) —
Sending to 192.168.80.30:5061 (NAT)

<— Transmitting (NAT) to 192.168.80.30:5061 —>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.80.30:5061;branch=z9hG4bK-b84734c9;received=192.168.80.30;rport=5061
From: Unknown Caller sip:spa3102@192.168.80.1;tag=daea7b1299b5a3a8o1
To: Unknown Caller sip:spa3102@192.168.80.1;tag=as00018c3a
Call-ID: 59e95fec-ea4373df@192.168.80.30
CSeq: 47241 REGISTER
Server: Asterisk PBX 1.8.11.1-1digium1~lucid
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm=“asterisk”, nonce="77ef4f55"
Content-Length: 0

<------------>
Scheduling destruction of SIP dialog ‘59e95fec-ea4373df@192.168.80.30’ in 32000 ms (Method: REGISTER)
[2012-10-21 12:31:53] NOTICE[13062]: chan_sip.c:24933 handle_request_register: Registration from ‘Unknown Caller sip:spa3102@192.168.80.1’ failed for ‘192.168.80.30:5061’ - No matching peer found
Scheduling destruction of SIP dialog ‘59e95fec-ea4373df@192.168.80.30’ in 32000 ms (Method: REGISTER)[/code]

Can someone help me in order to have it working?

TIA,

Paulo