If you're using the ooma system without a landline, ooma will provide incoming caller-ID at no charge. If you're using the ooma system with a landline back-up, you'll need to get caller-ID service through your landline phone company.
Outbound Caller-ID Blocking
From the ooma Lounge, you can set whether or not you want your name displayed on outbound calls. You can also choose which of your shared or personal numbers you wish to display. If you choose to disable outbound caller-ID, you can still enable it for individual calls by dialing the prefix *82 prior to placing the call.
During activation, your caller-ID will be set to use the name you registered your ooma account with. If you wish to change an existing outgoing caller-ID name, you can do so for a one-time charge of $11.99.