[asterisk-users] Help with cisco 7960 phone

[Jerry Geis]

I have a cisco 7960 phone. Worked fine in the office.
I took it home. At home I have a linksys router that the phone is 
plugged into.
The linksys router has DHCP enabled. I am getting the following error on 
the console from the 7960.
I have tried it with nat=yes and nat=no in the sip.conf file.
-----------------------

Transmitting (NAT) to 192.168.1.69:5060:
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 
192.168.1.69:5060;branch=z9hG4bK1415360297;received=192.168.1.69;rport=5060
From: "Display Name" <sip:570 at xx>;tag=1683635072
To: "Display Name" <sip:570 at xx>;tag=as4c59a734
Call-ID: 1929465491 at 192.168.1.69
CSeq: 3091 REGISTER
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="4a1c350c"
Content-Length: 0

--------------------------
The username and secret are the same as they were in the office when it 
worked.

I figure it has to be something easy but I have not found it yet. the 
sip.conf entry for this phone is:
[570]
type=friend
dtmfmode=rfc2833              
username=570
secret=XXXXXXXXXXX
disallow=all
allow=ulaw
allow=alaw
host=dynamic
context=local-sip
callerid="Home 570" <570>
nat=no

What might I try to get the phone working from home?

Thanks,

Jerry