Hey UltraSound, I don't know what the problem is, but I certainly have caller ID enabled, and it's worked since I've joined the service. Something may not be properly set up in your settings.
You are lucky. Can you let me know what do you put in the "Display Name" of your ATA/Line1 configuration? Your name, your VBuzzer UserID or your 10 digits tel number?
I don't know how CallerID never work for me. I have contacted VB tech support and they confirmed there is an issue and they are still working on this.