When you click-to-call on CRMPRO, you can use your own number as your caller ID and make calls to any US phone number.
First, you need the Chrome browser and a microphone and speakers or a headset.
Go to Setup –> User Preferences –> Phone number, and enter the number that you would like to show up as caller ID. Save this and then log out and back into CRMPRO for this setting to take effect.
Now you can right-click on any US phone number and call straight from your browser.