isx was merged with aptas, inc. and yp solutions in 2005 and has since been renamed local matters voice and wireless division, inc. isx stood for information services extended, inc. and specialized in directory assistance solutions for telecommunications companies, call centers, and content providers. prior to 2001, isx was a business unit of ibm dating back into the 1970s. the company is based out of fort lauderdale, florida. local matters voice and wireless division, inc. operates as a subsidiary of local matters and retained the ceo from isx. local matters press releases still refer to the division as isx.