asterisk users - Nov 2004 - Polycom Call Park (with sip debug attached)

If I have two extensions:

exten 128 SIP username: chris
exten 117 SIP username: pam

I call 128 from 117, and then try to use the Polycom IP 600 "park" 
softkey (on 117), it fails and this is what happens:

Sip read:
REFER sip:128@192.168.25.1 SIP/2.0
Via: SIP/2.0/UDP 192.168.25.119:5060;branch=z9hG4bKae271046B272902B
From: "pam" <sip:pam@pbx.kcdemo.com>;tag=5D8A8216-68EA6BE5
To: <sip:128@pbx.kcdemo.com;user=phone>;tag=as45347aaa
CSeq: 4 REFER
Call-ID: 87286f2a-2110cc58-539b8d5f@192.168.25.119
Contact: <sip:pam@192.168.25.119:5060>
User-Agent: PolycomSoundPointIP-SPIP_600-UA/1.3.1
Refer-To: sip:callpark@pbx.kcdemo.com;orbit=401 <--- Bingo!
Referred-By: "pam" <sip:pam@pbx.kcdemo.com>
Proxy-Authorization: Digest username="pam",
realm="asterisk",
nonce="53ace547",
uri="sip:128@pbx.kcdemo.com:5060;user=phone",
response="6ff3dcsdfgsdfgsfdgsdfgsdfg", algorithm=MD5 <--- changed
Max-Forwards: 70
Content-Length: 0


13 headers, 0 lines
Looking for callpark in friends
Looking for pam in friends
Reliably Transmitting (NAT):
SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 
192.168.25.119:5060;branch=z9hG4bKae271046B272902B;received=192.168.25.119;rport=5060
From: "pam" <sip:pam@pbx.kcdemo.com>;tag=5D8A8216-68EA6BE5
To: <sip:128@pbx.kcdemo.com;user=phone>;tag=as45347aaa
Call-ID: 87286f2a-2110cc58-539b8d5f@192.168.25.119
CSeq: 4 REFER
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER
Contact: <sip:128@192.168.25.1>
Accept: application/sdp
Content-Length: 0

It looks like in the first park request, * barfs on "Refer-To: 
sip:callpark@pbx.kcdemo.com;orbit=401"  This makes sense, because after 
pressing park I was prompted for what looked to be a park position, 
where I entered 401 (the first position in features.conf).  Is there 
anyone out there that has experience with this?  I have found some stuff 
from the archives but it doesn't help much.  Ideally I would like the 
park button to park the call on the first available position and go 
straight into a page, which I have already worked out with these phones. 
  Will SuperValetParking or any of the other alternative apps help with 
this?

Thanks.

--
Kristian Kielhofner