Country code: +992
Business directory in Russian. Reverse search by number (use the box at the top) or click on the regions highlighted by the orange buttons. The directory is organised by telephone number rather than company name which makes searching for a specific company difficult; you need to click on the number ranges and search down from there by clicking on each level until a result is shown. Not the most user friendly but if you're doing a reverse search on number only then it has its use.
Very limited business directory for Tajikistan. Currently offers over 200 business links. In Russian, with category and keyword search.
Simple to use Yellow Pages directory for Tajikistan for around 300 companies - includes reverse search by number (select the 'by phone' option).