This will ensure that the call duration is accurate for billing purposes. Multiple calls to the same number - Three calls within the same day to the same number or more than 21 calls a month to the same number. Lengthy calls - Calls greater than 30 minutes. Outside geographic area - Calls made to area codes not normally included in your agency's daily business. Outside normal work hours - Calls made before and after your normal business hours.
Lengthy calls made during lunch or break periods are prime candidates for abuse.
Specific telephone numbers - Numbers which appear not related to official business. If you see suspect numbers, check the bill from the previous month, and the next bill received, for a pattern. A suggested follow-up would be to call the suspect number and ask some questions about the relationship with your organization. The 4-digit station number remains the same. If you are dialing a location within the same area, you must still include Area code 352.