What revision of unisyn do I need to make caller id work?

Caller ID is not supported on the Unisyn in spite of what it may say in the manual!

I Have a system that has had it for a couple years. I'll have to stop by when I get close and check the revision on that unisyn.

Hey Guy,

I have two sets of Unisyn Chips that will allow your Caller ID to work. Shoot me an e-mail with mailing address and I'll send one free of charge. I'm not using them and someone might as well get some good out of them. These are new chips. Never Installed.