MENTOR PARTNERS LP
SC 13D, 1998-02-23
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                             (Amendment No. _____)1

                          NACT Telecommunications, Inc.
                                (Name of Issuer)

                          Common Stock, $.01 par value
                         (Title of Class of Securities)

                                    62872G109
                                 (Cusip Number)

                                 Daniel R. Tisch
                            c/o Mentor Partners, L.P.
                                 500 Park Avenue
                            New York, New York 10022
                                 (212) 935-7640
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                February 12, 1998
                      (Date of Event which Requires Filing
                               of this Statement)

     If the filing  person has  previously  filed a statement on Schedule 13G to
report the acquisition  which is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check the following box if a fee is being paid with the statement [ ]. (A fee is
not required only if the reporting person:  (1) has a previous statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)

Note: Six copies of this statement, including all exhibits,
should be filed with the commission.  See Rule 13d-1(a) for other
parties to whom copies are to be sent.

- ---------------------
1The remainder of this cover page shall be filled out for a reporting  persons's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes.).

                               Page 1 of 11 Pages

<PAGE>



                                  SCHEDULE 13D


CUSIP No.       62872G109               Page    2    of   11  Pages
             --------------                  -------    ------

- --------------------------------------------------------------------------------
     1       NAME OF REPORTING PERSON
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

             Mentor Partners, L.P.  Employer I.D.# 06-126-0469
- --------------------------------------------------------------------------------
     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       (a)  |_|
                                                                     (b)  |X|
- --------------------------------------------------------------------------------
     3       SEC USE ONLY
- --------------------------------------------------------------------------------
     4       SOURCE OF FUNDS*

                               WC
- --------------------------------------------------------------------------------
     5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
             TO ITEMS 2(d) or 2(e)                                        |_|


- --------------------------------------------------------------------------------
     6       CITIZENSHIP OR PLACE OF ORGANIZATION
             State of Delaware
- --------------------------------------------------------------------------------
                         7  SOLE VOTING POWER
        NUMBER OF

         SHARES              437,200
- --------------------------------------------------------------------------------
      BENEFICIALLY       8  SHARED VOTING POWER

        OWNED BY                     0
- --------------------------------------------------------------------------------
          EACH
                         9  SOLE DISPOSITIVE POWER
        REPORTING
                            437,200
         PERSON
- --------------------------------------------------------------------------------
          WITH          10  SHARED DISPOSITIVE POWER

                                      0
- --------------------------------------------------------------------------------
    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

             437,200
- --------------------------------------------------------------------------------
    12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
             SHARES*                                                     |_|
- --------------------------------------------------------------------------------
    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    5.4%
- --------------------------------------------------------------------------------
    14       TYPE OF REPORTING PERSON*
                   PN


- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 2 of 11 Pages

<PAGE>

Item 1.  Security and Issuer.

     This statement  relates to shares (the "Shares") of the Common Stock,  $.01
par  value,  of NACT  Telecommunications,  Inc.,  a  Delaware  corporation  (the
"Company").  The Company's  principal  executive offices are located at 191 West
5200 North, Provo, Utah 84604.

Item 2. Identity and Background.

     This  statement  is filed on behalf of Mentor  Partners,  L.P.,  a Delaware
limited  partnership (the  "Partnership")  with respect to Shares of the Company
(a)  owned by the  Partnership  and (b) owned by Mentor  Offshore  Fund  Limited
("Offshore"),  a Cayman Islands company.  The general partner of the Partnership
is WTG & Co., L.P., a Delaware limited  partnership (the "General  Partner") and
the general  partner of the General  Partner is D. Tisch & Co., Inc., a Delaware
corporation  ("D.  Tisch & Co."),  all of the common  stock of which is owned by
Daniel R. Tisch  (collectively with D. Tisch & Co. and the General Partner,  the
"Control Persons").

     The  address  of  the  principal  offices  and  principal  business  of the
Partnership  and each of the Control  Persons is 500 Park Avenue,  New York, New
York 10022.

     The Partnership's principal business is investment in securities, primarily
in  connection  with  "merger" (or "risk")  arbitrage  and, to a lesser  extent,
classic arbitrage, including convertible


                                Page 3 of 11 Pages
<PAGE>

securities  arbitrage.  The  principal  business of the General  Partner is
serving as the general partner of the  Partnership.  The General Partner acts as
the investment  advisor to Offshore and votes shares held by Offshore.  The sole
business  of D.  Tisch & Co. is serving as the  general  partner of the  General
Partner,  and other  than such  service,  D. Tisch & Co.  has no  investment  or
operating history of any kind. Daniel R. Tisch's principal occupation is that of
President  and  sole  Director  of D.  Tisch & Co.,  and he is a  United  States
citizen.

     Neither  the  Partnership  nor, to its best  knowledge,  any of the Control
Persons  has  during  the last five  years:  (i) been  convicted  in a  criminal
proceeding (excluding traffic violations or similar misdemeanors) or (ii) been a
party to a civil  proceeding of a judicial or  administrative  body of competent
jurisdiction and as a result of such proceeding was or is subject to a judgment,
decree  or final  order  enjoining  future  violations  of,  or  prohibiting  or
mandating activities subject to, Federal or State securities laws or finding any
violation with respect to such laws.

Item 3. Source and Amount of Funds or Other Consideration.

     The  $6,453,391.02   used  to  purchase  Shares  of  the  Company  for  the
Partnership came from the Partnership's working capital,  which may at any given
time include funds  borrowed in the ordinary  course of its business  activities
from margin accounts. All Shares of the Company acquired by the Partnership were
purchased 


                               Page 4 of 11 Pages
<PAGE>

in the ordinary course of business.

     The  $597,647.37  used to purchase  Shares of the Company for  Offshore was
furnished from Offshore's  investment  capital,  which at any given time include
funds  borrowed in the ordinary  course of its business  activities  from margin
accounts.  All of the Shares of the Company acquired for Offshore were purchased
in the ordinary course of business.

Item 4. Purpose of Transaction.

     The  Partnership  and  Offshore  acquired  the  Shares of the  Company  for
investment purposes, and only in the ordinary course of business.

     In the ordinary course of business,  the  Partnership  and/or Offshore from
time  to  time  evaluate  their  holdings  of  securities,  and  based  on  such
evaluation,  the Partnership and/or Offshore may determine to acquire or dispose
of securities of specific issuers.

     Neither the Partnership  nor, to its knowledge,  any of the Control Persons
or Offshore have any present plans or intentions which would result in or relate
to  any  of  the  transactions  described  in  subparagraphs  (a)  through  (j),
inclusive, of Item 4 of Schedule 13D.

tem 5. Interest in Securities of the Issuer.

        (a) As of the date hereof,  the Partnership owns 


                               Page 5 of 11 Pages
<PAGE>

beneficially   an  aggregate  of  400,000   Shares  of  the  Company  (or
approximately  4.9% of the Company's  Common Stock  outstanding  on February 13,
1998) and the Partnership  may be deemed to own  beneficially an aggregate of an
additional  37,200  Shares of the Company (or 0.5% of the Company  common  stock
outstanding  on February 13, 1998) owned by Offshore,  in each case based on the
number of 8,129,096 Shares of Company Common Stock then outstanding as set forth
in the Company's most recent filing with the Securities and Exchange Commission.

         (b) The Partnership  (through the Control Persons) has the sole power
to vote, and dispose of, all the Shares  beneficially  owned by the Partnership.
In addition,  the General Partner is a party to investment management agreements
pursuant to which the General Partner has investment responsibility with respect
to the  Company's  Shares owned by Offshore.  Pursuant to such  agreements,  Mr.
Tisch has the power to dispose of (or to direct the  disposition  of) the Shares
of the Company owned by Offshore.

          (c) Except as set forth in  Exhibit  A, which is hereby  incorporated
herein by reference, no transactions in the Shares have been effected during the
past sixty days by the Partnership or, to its best knowledge, any of the Control
Persons or Offshore.

          (d)  Neither the Partnership nor, to its best knowledge, any of the
Control  Persons or Offshore have or know any 

                               Page 6 of 11 Pages

<PAGE>


other  person  who has the right to  receive  or the  power to  direct  the
receipt  of  dividends  from,  or the  proceeds  from the sale  of,  any  Shares
beneficially owned by the Partnership or Offshore.

          (e)  Not applicable.

Item  6.  Contracts, Arrangements, Understandings or Relationship
          with Respect to Securities of the Issuer.


     Except  as  referred  or   described   above,   there  are  no   contracts,
arrangements,  understandings  or  relationships  (legal or otherwise) among the
persons named in Item 2 or between any of such persons and any other person with
respect  to any  securities  of the  Company.

Item 7.  Material  to be Filed as Exhibits.

     Exhibit A --  Acquisitions of Shares by the Partnership and
                   Offshore During the Past Sixty Days.


                               Page 7 of 11 Pages

<PAGE>



                                    SIGNATURE


     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.


                                          February 20, 1998
                                          ------------------------
                                                 (Date)


                                          /s/  Daniel Tisch
                                          ------------------------
                                               (Signature)


                                          Daniel R. Tisch
                                          Authorized Signatory
                                          MENTOR PARTNERS, L.P.
                                          -------------------------
                                               (Name/Title)


                               Page 8 of 11 Pages

<PAGE>



                                  EXHIBIT INDEX
                                  -------------


Exhibit A --   Acquisitions of Shares by the Partnership and
               Offshore During the Past Sixty Days.




                               Page 9 of 11 Pages

<PAGE>



                                    EXHIBIT A
                                    ---------

                    Acquisitions of Shares by the Partnership
                    and Offshore During the Past Sixty Days  
                    -----------------------------------------

                    Date of           Number      Aggregate        Price Per
      Entity      Transaction        of Shares      Price            Share
      ------      -----------        ---------    ---------        ---------
Partnership     January 6, 1998         35,000     559,709.50        15.992

                January 7, 1998         25,000     405,687.50        16.228

                January 7, 1998         40,000     645,520.00        16.138

                January 8, 1998         15,000     244,350.00        16.290

                January 8, 1998         26,000     423,280.00        16.280
 
                January 9, 1998         16,000     258,171.20        16.136

                January 9, 1998         20,000     319,350.00        15.968

                January 12, 1998        10,000     155,213.00        15.521

                January 12, 1998         8,400     130,428.48        15.527

                January 13, 1998        17,900     280,108.15        15.649

                January 13, 1998        22,300     351,624.17        15.768

                January 14, 1998        25,000     392,907.50        15.716

                January 22, 1998         9,500     157,317.15        16.560

                January 22, 1998         2,400      39,672.00        16.530

                January 23, 1998        10,000     165,400.00        16.540

                January 26, 1998        14,500     239,322.50        16.505

                January 27, 1998        13,300     216,031.90        16.243

                January 27, 1998           800      12,929.52        16.162

                January 28, 1998         1,000      16,165.00        16.165

                January 29, 1998         2,000      32,185.00        16.093

                February 3, 1998         1,000      16,165.00        16.165

                February 4, 1998           400       6,466.00        16.165

                February 5, 1998         3,200      52,128.00        16.290

                February 9, 1998        31,300     516,496.95        16.502

                February 10, 1998        5,000      82,700.00        16.540

                February 12, 1998       45,000     734,062.50        16.313


                               Page 10 of 11 Pages

<PAGE>





Offshore     January 6, 1998             9,100     145,524.47        15.992

             January 7, 1998             1,900      30,662.20        16.138

             January 8, 1998             4,000      65,120.00        16.280

             January 12, 1998            5,000      77,636.00        15.527

             January 13, 1998            2,500      39,121.25        15.649

             January 13, 1998            2,500      39,419.75        15.768

             January 22, 1998            1,000      16,530.00        16.530

             January 23, 1998            3,500      57,855.00        16.530

             January 26, 1998              500       8,252.50        16.505

             January 27, 1998            1,000      16,161.90        16.162

             February 9, 1998            1,200      19,801.80        16.502

             February 12, 1998           5,000      81,562.50        16.313
================================================================================

All Shares  acquired by the  Partnership  and  Offshore  were  purchased in
transactions on the over-the-counter market.



                               Page 11 of 11 Pages




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