Some of the call processing the Service Flag used for:

• After Work
  The night service redirects callers to the extension or telephone number of the person who covers the business during closed hours.
• Voicemail
  The Service Flag allows the customer to leave a message and receive a reply from the company. 
• Information
  A Service Flag can play different recordings of information (e.g., hours of operation, directions, contact information).
• Group
  Service Flags can direct calls to different groups at different times and dates.
• Auto Attendant
  Different Auto Attendants can be activated at different times and dates by the Service Flag.