About once a month I see here some variant of a request for blocking incoming calls based on caller ID.
I've heard a rumor that Mitel may add that into a future release but I wouldn't hold my breath.
After meeting with a group of techies last December, I may have an inexpensive "off board" solution that would do this.
Unfortunately I don't have time to test and document.
I put up a poll to gauge interest to see if it would be worth my time but only 8 people voted.
You can see it here. Once I'm through this major project I'm on perhaps I'll have time to test, document and throw online.
But I'd think I'm about 3 months out from even thinking about it at this time.
But to answer your question, no, the 3300 doesn't do that.
As others have suggested you can do it via a NuPoint or PraireFyre IQ.
Ralph
Ralph