<PAGE>                                                        


                                  SCHEDULE II

                                              ZOOM TELEPHONICS, INC.
                                         VALUATION AND QUALIFYING ACCOUNTS
                                    Years ending December 31, 1996, 1997, 1998
<TABLE>
<CAPTION>
<S>                                 <C>                    <C>                    <C>               <C>
                                        Balance at                                                     Balance
                                                                                         Amounts               at
                                        beginning            Charged to                                  end
           Description                           of                                      written               of
                                           year               expense                off                 year

Reserve for doubtful accounts          $       848,876       $      400,000        $      165,568     $   1,083,308
Reserve for price protection                   500,717            3,536,410             3,328,531           708,596
Reserve for sales returns                      720,496                    -                   442           720,054
Other allowances                               647,374            1,855,183             1,450,414         1,052,143
                                               -------            ---------             ---------         ---------
Year ending December 31, 1996           $    2,717,463        $   5,791,593         $   4,944,955     $   3,564,101
                                             =========            =========             =========         =========

Reserve for doubtful accounts           $    1,083,308        $   2,631,782         $   3,248,060    $      467,030
Reserve for price protection                   708,596            5,965,245             5,367,363         1,306,478
Reserve for sales returns                      720,054              626,426               314,841         1,031,639
Other allowances                             1,052,143            3,531,766             2,870,850         1,713,059
                                             ---------            ---------             ---------         ---------
Year ending December 31, 1997           $    3,564,101         $ 12,755,219          $ 11,801,114     $   4,518,206
                                             =========           ==========            ==========         =========

Reserve for doubtful accounts          $       467,030          $   652,173           $   314,203    $      805,000
Reserve for price protection                 1,306,478            3,321,809             3,061,172         1,567,115
Reserve for sales returns                    1,031,639           10,459,596            10,542,648           948,587
Other allowances                             1,713,059            3,268,744             2,614,754        2,367,049
                                             ---------            ---------             ---------        ---------
Year ending December 31, 1998            $   4,518,206         $ 17,702,322          $ 16,532,777     $   5,687,751
                                             =========           ==========            ==========         =========

</TABLE>