asterisk users - Jun 2006 - Caller ID info for DID calls?

I have a single DID number from sellvoip.net.

This works well and has been mostly reliable (HEH).  I am wondering if 
caller id info is likely be provided for calls to my DID #?

If so, should they show up in the CLI(they don't)?  Or how do I go 
about looking at them (the caller ID infos that is)?

Thanks,
Marty