Dunno if it's the same for everyone, but for me, I had to:
1) Enable CNAM in callcentric. (disabled by default?)
2) Remove UserAgentDomain on the obi setup.
Otherwise, I kept getting authentication errors (but could login with the same credentials with soft phone, so I knew they were fine.)
And the phone book entry in callcentric does override the CNAM, very handy for vague cell phones that come up "City, State" you can make them come up as "Aunt Ruth"
Too bad google voice doesn't offer this directly, I would have paid _just_ for that.
I think pc44's post should be Sticky'd!!
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MRTT