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Hi David,
Thank you very much for you quick answer. We have a UCM 8.0 setup where this works like a charm; our customer is running 8.6.1 and no matter what we do to the user, we have had no luck so far.
We consistently get <CiscoIPPhoneError Number="4" /> for a response.
Do you have a couple things we could/should check to get this going?
Paulo Silva

Thanks, Sascha!
The answer is yes! The authentication URL has an IP address in it.
We setup an End User, associated the particular device with it and associated the user with all the groups in the system...still we get the error mencioned above... 
Paulo Silva

Did you set both the secure and non secure authentication URL on the CUCM?

Sent from my mobile device

On Nov 7, 2012, at 3:45 PM, "Cisco Developer Community Forums" <cdicuser@developer.cisco.com<mailto:cdicuser@developer.cisco.com>> wrote:

David Staudt has created a new message in the forum "IP Phone Services Questions": -------------------------------------------------------------- A network packet capture (via Wireshark) is usually the best way to inspect the actual authentication request and response for issues (make sure and capture from a PC connected to the phone's extra PC switch port.) Feel free to attach the pcap here.
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To respond to this post, please click the following link: http://developer.cisco.com/web/ipps/community/-/message_boards/view_message/8402824 or simply reply to this email.

Hello,
Using Wireshark and Fiddler we discovered two things:
#1: the authentication request agaisnt UCM returns AUTHORIZED
http:/xxx.xxx.xxx.xxx:8080/ccmcip/authenticate.jsp?UserID=xxxxxxx&Password=xxxxxxx&devicename=SEPIPC2525
In spite of this, the phone still returns an Error code 0
 
#2: When launching IP Communicator, we found a couple 404 errors looking for a tlv file (CTL certificate)
Not entirely sure what this may mean
Thanks in advance!
Paulo Silva