Dear friends

My Client having MPD (Metering pulse Detection) on their PSTN lines(Loop start)i installed Office Serv 7070 and MMC 414 mention the MPD but the duration is coming 00:00:00 on all calls either mature call or not mature call ,do i need any hard ware to work with this ,question No 2 if i get PRS (polarity reversal line ) do i need any other hardware