- 16-TO ORIGINATE AN OUTSIDE CALL VIA EXTENSION LINE KEY• Lift handset or press Speaker key, receive dial tone.• Dial the Central Office access code, e.g. 9.• Dial desired telephone number.• Use handset or MIC to converse.TO ORIGINATE AN INTERNAL CALL• Lift handset or press Speaker key.• Receive dial tone.• Dial desired station number.• Use handset or MIC to converse.TO ORIGINATE A CALL VIA DYNAMIC DIAL PAD• While phone is idle, Dial desired station number.-- OR –• While phone is idle, Dial desired trunk access code, e.g. 9• Dial desired telephone number.• Use handset or MIC to converse.NOTE: Access to feature is based on data assignment.