Setting Up a Phone Number
Your Phone is managed from Profiles > Phone (open the Profile menu from the user drop-down menu on the upper right, then select Phone).
When you visit the phone tab for the first time you will be prompted to and enter your area code. Once you've done that select search, and you will be shown a variety of phone numbers you can pick from. Select the phone number you'd like by pressing "Get This".
Phone Configuration
Once you selected your number, it's time to set up your call routing View the phone configuration article.