asterisk users - Oct 2003 - Zultys Zip 2 Registration / Disabling SIP Authorization

I'm trying to get a Zultys Zip 2 phone working with Asterisk.  The phone
seems to be failing registration (see sip debug output below).  However, I
can place calls TO the Zip2 from other SIP phones (Grandstream BT-101, Xten
X-Lite, and eStara Softphone) and from Nortel PBX extensions coming in to
Asterisk over a PRI T1.  The problem is that I cannot dial any extensions
from the Zip 2.  Any extension gets an immediate busy signal and NO output
from sip debug (not even any packets in tcpdump).  The Zip 2 does show up in
"sip show peers":

Name/username    Host                 Mask             Port     Status
157672/157672    172.16.0.163         255.255.255.255  5060     Unmonitored

Zultys support (which has been pretty good so far, by the way) says that the
Zip 2 does not yet support authorization, and that I need to "disable
authorization" on Asterisk.  They say they have tested with Asterisk, and
Asterisk is listed on the compatibility list for the Zip 2.  

My sip.conf for that phone follows, along with the relevant output from sip
debug when the phone tries to register (Asterisk is on 10.1.1.45, the Zip 2
is 172.16.0.163).  How do I disable authorization for this phone, beyond not
specifying a secret? 

Is anyone successfully using Zultys phones with Asterisk?  What am I
missing?

Thanks,
Randy Johnson


[157672]
disallow=all
allow=ulaw
type=friend
insecure=yes
host=172.16.0.163
context=softphones
callerid="Zip2"<3767>
canreinvite=no
dtmfmode=rfc2833

Here is the resulting SIP exchange when the Zip2 restarts. 

REGISTER sip:10.1.1.45 SIP/2.0
Call-ID: 5e1c-4a61c-ac101467@10.1.1.45
From: 157672<sip:157672@10.1.1.45;user=phone>;tag=25ad4-1c75
To: 157672<sip:157672@10.1.1.45;user=phone>
CSeq: 101 REGISTER
Via: SIP/2.0/UDP 172.16.0.163:5060
Contact: <sip:157672@172.16.0.163:5060;user=phone>
Max-Forwards: 70
User-Agent: Zultys ZIP 2
Expires: 1800
Supported: timer
Content-Length: 0 

12 headers, 0 lines
Using latest request as basis request
Sending to 172.16.0.163 : 5060 (non-NAT)
Transmitting (no NAT):
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 172.16.0.163:5060
From: 157672<sip:157672@10.1.1.45;user=phone>;tag=25ad4-1c75
To: 157672<sip:157672@10.1.1.45;user=phone>;tag=as6e42ea2b
Call-ID: 5e1c-4a61c-ac101467@10.1.1.45
CSeq: 101 REGISTER
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER
Contact: <sip:157672@10.1.1.45>
Content-Length: 0 

to 172.16.0.163:5060


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