UPDATE Nov. 7, 2012:
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Unfortunately, I spoke too soon. It looks like new ICM still has some problems, the biggest is it's unable to save the forwarding number. It was saving yesterday, but today all calls were forwarded to medical emergency services, instead of off-site receptionist. Support tried to troubleshoot, but in the end gave up and suggested to revert back and wait until the service goes into production mode.
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Thanks for reminding! I got the email with the invitation; I told Doctor (business owner) about it; and then we both forgot
Now that it is enabled, we are setting it up. it feels a little bit confusing - some options take effect right away; others require pressing Save button. But the help pages are very good; and this feature is extremely important for the business.