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War dialing is still considered a threatening activity, and the authorities do remain on the lookout for evidence of possible war dialing instances. Be certain to verify all number ranges with the target organization prior to beginning. The organization should be able to positively identify all numbers as belonging to them. Additionally, if you are going to war dial, please make sure to have your client's signed authorization letter with you at all times. There are several things you should remember when war dialing in order to make sure you avoid suspicion of criminal activity.
Call during off hours. Dial-in penetration is best performed after working hours so that people sitting at their desks don't answer the phone when your war dialing software calls.
Do not dial numbers sequentially. This is a crucial point. In an effort to thwart dial-in penetration attempts several years ago, phone companies modified their networks to monitor for and generate an alert when consecutive numbers are dialed from a single phone number. Therefore, it is imperative that you configure your war dialing software to randomize the phone numbers you dial. If the phone company notices sequential numbers being dialed, it may disable your phone line and notify a certain law enforcement agency. Don't be surprised if representatives of that law enforcement agency contact you in regards to your actions.
Go slowly. You may want to spread your war dialing over a large period of time. Just because you have the capability to dial 10,000 numbers a night doesn't mean you have to. You could spread 10,000 numbers out over two or three nights (or weeks, given your time constraints) to reduce the likelihood that you will be noticed.
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