I posted this over on the http://www.vnet-corp.com/forum.htm as well..
Hi all! I got sipphone working with my Call Manager Express setup, and thought I would share. The main gotcha was to set the username the SAME as the extension. The second problem is that sipphone doesn't honor SIP message 423 'Interval Too Brief', in response to sipphone's registration interval default of 120 seconds (which you cannot change in the application). Ideally, sipphone should let you change this value to whatever you want, AND sipphone should automatically adjust up if necessary to honor SIP 423 messages.
Here is the config for my UCME SIP line:
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