Cablevision Systems, which serves some 3 million households in the New York metropolitan area, added more than 130,000 VoIP customers for Q4 2005 and 458,653 for all of 2005. Some other operating highlights:Optimum Online high-speed data customers up 93,900 or 5.9% for the quarter and 341,793 or 25.3% for the yearBasic video customers were up 17,930 or 0.6% for the quarter and 63,993 or 2.2% for the year; the company's seventh consecutive quarter of basic video subscriber gainsInteractive Optimum digital video customers were up 119,496 or 6.5%...