to enter a specified extension or phone number and then touch 
 to initiate a call.
 to display a list of previous calls. See Call History for more information.
 to display a list of saved contacts. See Contacts for more information.
 to display a list of favorite contacts. See Favorites for more information.
 to initiate a call to the most recently dialed location.
 to initiate a call to a number preset by the system administrator