Speed
Dialing > Adding Speed Dial Buttons to a Group or Updating
Speed Dial Button Information
Include trunk numbers (for example, a 1 or 9 to get an outside
line), area codes and exchanges when entering outside numbers. Use any
characters you want to format the number - hyphens, parentheses,
letters, or periods; these characters are ignored when the number is dialed. For
internal numbers, follow your telephone system protocols for extensions or other
offices.