From the Nextiva voice admin dashboard, hover over Users > ManageUsers > select the user > Routing > Shared call appearance.
Set up multiple phones by clicking the plus (+) icon under the shared call appearance menu.
Select the device from the User Device drop-down list, and enter a unique string, such as the user’s username in the Line/port field.
TIP: Make sure the Enable this location, Allow origination from this location and Allow termination to this location checkboxes are selected. These three settings will ensure the user can make and receive calls from each device assigned to their user account.