Prophecy 2006

I've got my hands on a Nokia E61, and I can't quite figure out how to make it connect to a Prophecy server.

Ordinary softphones don't need to register or have a proxy defined; I can just type in the name of the extension and the server (e.g., "connectionTest@flute") and I'll connect up.

With the Nokia, the darn thing seems to insist that it be "registered," and if the phone isn't registered I can't use the SIP stack at all.

I expect that I can run an Asterisk or Freeswitch server to act as a registrar and make connections between my phone and P2006, but it'd be far nicer to have the Nokia connect directly.

Any suggestions? If so, please include a comment with the answer.

My settings for the E61 include:

Proxy:
Server: flute (IP address)
Realm: flute

the rest set to None and/or defaults

For registration:
Server: None
Realm: flute

the rest set to None and/or defaults