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112

112 ñ DTMF Trickle Rate: If the time in between dialed digits is too long, the central office will drop the line. On the other hand, if the phone finishes dialing the number before the user has deposited the money, the payphone owner is responsible for the charges incurred, whether or not the user actually deposits the money. In order to avoid both circumstances, a Protel payphone will dial another digit every 4 or 8 seconds, whichever is selected in this field. If the user has not deposited the money before the last digit is dialed, the phone will drop the line and start over again. If the money is deposited right away, the digits are dialed without delay.