You can browse not just your contacts on the device but also your PBX contacts by clicking on Address Book and then choosing PBX from the menu.

By pressing on the Search icon  you can narrow down the displayed contacts by typing in the search box or you may also click on the microphone
  you can narrow down the displayed contacts by typing in the search box or you may also click on the microphone  icon  for voice to text translation.
 icon  for voice to text translation.

You may add a contact by pressing on the floating Add Contact icon  found on the lower right portion of the screen. This will open the add 
contact page where you can fill in the contact’s details. (Note: Saving 
as PBX contact is not an available option.)
 
 found on the lower right portion of the screen. This will open the add 
contact page where you can fill in the contact’s details. (Note: Saving 
as PBX contact is not an available option.)

By clicking on the contact name you 
can view the details for the contact. You may also edit the contacts 
details (only for device contacts) from here by clicking on the pencil 
icon  .
.
|  |  | 
From the contacts page you can initiate the following actions via the corresponding icons beside the contact name, extension, or phone number:
Note: For contacts with multiple numbers you may have to open the contact’s details to see the icons.
|  | Voice only call | 
|  | Video call | 
|  | SMS / Chat message |