1
                                                                     EXHIBIT 3.1

                            ARTICLES OF INCORPORATION
                                       OF
                                 INTRNTUSA, INC


                                   ARTICLE ONE

The name of the Corporation is INTRNTUSA, Inc.

                                   ARTICLE TWO

The period of duration of the Corporation is perpetual.

                                  ARTICLE THREE

         The purpose for which the Corporation is organized is to engage in the
transaction of any and all lawful business for which corporations may be
incorporated under the Texas Business Corporation Act.

                                  ARTICLE FOUR

         The total number of shares of all classes of capital stock which the
Corporation shall have authority to issue is twenty million (20,000,000), of
which (a) fifteen million (15,000,000) shares shall be designated as Common
Stock, par value $.0l per share, and (b) five million (5,000,000) shares shall
be designated as Preferred Stock, par value $.0l per share.

         The following is a statement of the designations, preferences,
limitations, and relative rights, including voting rights, in respect of the
classes of stock of the Corporation and of the authority with respect thereto
expressly vested in the Board of Directors of the Corporation:

                                  COMMON STOCK

         (1) Each share of Common Stock of the Corporation shall have identical
rights and privileges in every respect. The holders of shares of Common Stock
shall be entitled to vote upon all matters submitted to a vote of the
shareholders of the Corporation and shall be entitled to one vote for each share
of Common Stock held.

         (2) Subject to the prior rights and preferences, if any, applicable to
shares of the Preferred Stock or any series thereof, the holders of shares of
the Common Stock shall be entitled to receive such dividends (payable in cash,
stock, or otherwise) as may be declared thereon by the Board of Directors at any
time and from time to time out of any funds of the Corporation legally available
therefor.



   2


         (3) In the event of any voluntary or involuntary liquidation,
dissolution, or winding-up of the Corporation, after distribution in full of the
preferential amounts, if any, to be distributed to the holders of shares of the
Preferred Stock or any series thereof, the holders of shares of the Common Stock
shall be entitled to receive all of the remaining assets of the Corporation
available for distribution to its shareholders, ratably in proportion to the
number of shares of the Common Stock held by them. A liquidation, dissolution,
or winding-up of the Corporation, as such terms are used in this Paragraph (3),
shall not be deemed to be occasioned by or to include any merger of the
Corporation with or into one or more corporations or other entities, any
acquisition or exchange of the outstanding shares of one or more classes or
series of the Corporation, or any sale, lease, exchange, or other disposition of
all or a part of the assets of the Corporation.

                                 PREFERRED STOCK

         (4) Shares of the Preferred Stock may be issued from time to time in
one or more series, the shares of each series to have such designations,
preferences, limitations, and relative rights, including voting rights, as shall
be stated and expressed herein or in a resolution or resolutions providing for
the issue of such series adopted by the Board of Directors of the Corporation.
Each such series of Preferred Stock shall be designated so as to distinguish the
shares thereof from the shares of all other series and classes. The Board of
Directors of the Corporation is hereby expressly authorized, subject to the
limitations provided by law, to establish and designate series of the Preferred
Stock, to fix the number of shares constituting each series, and to fix the
designations and the preferences, limitations, and relative rights, including
voting rights, of the shares of each series and the variations of the relative
rights and preferences as between series, and to increase and to decrease the
number of shares constituting each series, provided that the Board of Directors
may not decrease the number of shares within a series to less than the number of
shares within such series that are then issued. The relative powers, rights,
preferences, and limitations may vary between and among series of Preferred
Stock in any and all respects so long as all shares of the same series are
identical in all respects, except that shares of any such series issued at
different times may have different dates from which dividends thereon cumulate.
The authority of the Board of Directors of the Corporation with respect to each
series shall include, but shall not be limited to, the authority to determine
the following:

                  (a)      The designation of such series;

                  (b)      The number of shares initially constituting such 
         series;

                  (c) The rate or rates and the times at which dividends on the
         shares of such series shall be paid, the periods in respect of which
         dividends are payable, the conditions upon such dividends, the
         relationship and preferences, if any, of such dividends to dividends
         payable on any other class or series of shares, whether or not such
         dividends shall be cumulative, partially cumulative, or noncumulative,
         if such dividends shall be cumulative or partially cumulative, the
         date or dates from and after which, and the amounts in which, they
         shall accumulate, whether such dividends shall be share dividends,
         cash or other dividends, or any  combination thereof, and if such 
         dividends shall include share dividends, whether such share dividends 
         shall 



                                       2

   3

         be payable in shares of the same or any other class or series of
         shares of the Corporation (whether now or hereafter authorized), or
         any combination thereof and the other terms and conditions, if any,
         applicable to dividends on shares of such series. The Board of
         Directors of the Corporation is hereby expressly empowered, subject to
         the limitations provided by law, to authorize the Corporation to pay
         share dividends on any class or series of capital stock of the
         Corporation (whether now or hereafter authorized) payable in shares of
         the same or any other class or series of capital stock of the
         Corporation (whether now or hereafter authorized) or any combination
         thereof;

                  (d) Whether or not the shares of such series shall be
         redeemable or subject to repurchase at the option of the Corporation or
         the holder thereof or upon the happening of a specified event, if such
         shares shall be redeemable, the terms and conditions of such
         redemption, including but not limited to the date or dates upon or
         after which such shares shall be redeemable, the amount per share which
         shall be payable upon such redemption, which amount may vary under
         different conditions and at different redemption dates, and whether
         such amount shall be payable in cash, property, or rights, including
         securities of the Corporation or another corporation;

                  (e) The rights of the holders of shares of such series (which
         may vary depending upon the circumstances or nature of such
         liquidation, dissolution, or winding up) in the event of the voluntary
         or involuntary liquidation, dissolution, or winding up of the
         Corporation and the relationship or preference, if any, of such rights
         to rights of holders of stock of any other class or series. A
         liquidation, dissolution, or winding up of the Corporation, as such
         terms are used in this subparagraph (e), shall not be deemed to be
         occasioned by or to include any merger of the Corporation with or into
         one or more corporations or other entities, any acquisition or exchange
         of the outstanding shares of one or more classes or series of the
         Corporation, or any sale, lease, exchange, or other disposition of all
         or a part of the assets of the Corporation;

                  (f) Whether or not the shares of such series shall have voting
         powers and, if such shares shall have such voting powers, the terms and
         conditions thereof, including, but not limited to, the right of the
         holders of such shares to vote as a separate class either alone or with
         the holders of shares of one or more other classes or series of stock
         and the right to have more (or less) than one vote per share; provided,
         however, that the right to cumulate votes for the election of directors
         is expressly denied and prohibited;

                  (g) Whether or not a sinking fund shall be provided for the
         redemption of the shares of such series and, if such a sinking fund
         shall be provided, the terms and conditions thereof;

                  (h) Whether or not a purchase fund shall be provided for the
         shares of such series and, if such a purchase fund shall be provided,
         the terms and conditions thereof;

                                       3

   4


                  (i) Whether or not the shares of such series, at the option of
         either the Corporation or the holder or upon the happening of a
         specified event, shall be convertible into stock of any other class or
         series and, if such shares shall be so convertible, the terms and
         conditions of conversion, including, but not limited to, any provision
         for the adjustment of the conversion rate or the conversion price;

                  (j) Whether or not the shares of such series, at the option of
         either the Corporation or the holder or upon the happening of a
         specified event, shall be exchangeable for securities, indebtedness, or
         property of the Corporation and, if such shares shall be so
         exchangeable, the terms and conditions of exchange, including, but not
         limited to, any provision for the adjustment of the exchange rate or
         the exchange price; and

                  (k) Any other preferences, limitations, and relative rights as
         shall not be inconsistent with the provisions of this Article Four or
         the limitations provided by law.

         (5) Except as otherwise required by law or in any resolution of the
Board of Directors creating any series of Preferred Stock, the holders of shares
of Preferred Stock and all series thereof who are entitled to vote shall vote
together with the holders of shares of Common Stock, and not separately by
class.

                                  ARTICLE FIVE

         No holder of any shares of capital stock of the Corporation, whether
now or hereafter authorized, shall, as such holder, have any preemptive or
preferential right to receive, purchase, or subscribe to (a) any unissued or
treasury shares of any class of stock (whether now or hereafter authorized) of
the Corporation, (b) any obligations, evidences of indebtedness, or other
securities of the Corporation convertible into or exchangeable for, or carrying
or accompanied by any rights to receive, purchase, or subscribe to, any such
unissued or treasury shares, (c) any right of subscription to, any right to
receive, or any warrant or option for the purchase of, any of the foregoing
securities, or (d) any other securities that may he issued or sold by the
Corporation.

                                   ARTICLE SIX

         The Corporation will not commence business until it has received for
the issuance of its shares consideration of the value of $1,000.00, consisting
of money, labor done, or property actually received.

                                  ARTICLE SEVEN

         Cumulative voting for the election of directors is expressly denied 
and prohibited.

                                       4

   5


                                  ARTICLE EIGHT

         The Corporation shall have the power and authority to indemnify any
person to the fullest extent permitted by law.

                                  ARTICLE NINE

         Any action of the Corporation which, under the provisions of the Texas
Business Corporation Act or any other applicable law, is required to be
authorized or approved by the holders of any specified fraction which is in
excess of one-half or any specified percentage which is in excess of fifty
percent of the outstanding shares (or of any class or series thereof) of the
Corporation shall, notwithstanding any law, be deemed effectively and properly
authorized or approved if authorized or approved by the vote of the holders of
more than fifty percent of the outstanding shares entitled to vote thereon (or,
if the holders of any class or series of the Corporation's shares shall be
entitled by the Texas Business Corporation Act or any other applicable law to
vote thereon separately as a class, by the vote of the holders of more than
fifty percent of the outstanding shares of each such class or series). Without
limiting the generality of the foregoing, the foregoing provisions of this
Article Nine shall be applicable to any required shareholder authorization or
approval of: (a) any amendment to these articles of incorporation; (b) any plan
of merger, share exchange, or reorganization involving the Corporation; (c) any
sale, lease, exchange, or other disposition of all, or substantially all, the
property and assets of the Corporation; and (d) any voluntary dissolution of the
Corporation.

         Directors of the Corporation shall be elected by a plurality of the
votes cast by the holders of shares entitled to vote in the election of
directors of the Corporation at a meeting of shareholders at which a quorum is
present.

         Except as otherwise provided in this Article Nine or as otherwise
required by the Texas Business Corporation Act or other applicable law, with
respect to any matter, the affirmative vote of the holders of a majority of the
Corporation's shares entitled to vote on, and voted for or against, that matter
at a meeting of shareholders at a meeting of shareholders at which a quorum is
present shall be the act of the shareholders.

         Nothing contained in this Article Nine is intended to require
shareholder authorization or approval of any action of the Corporation
whatsoever unless such approval is specifically required by the other provisions
of these articles of incorporation, the bylaws of the Corporation, or by the
Texas Business Corporation Act or other applicable law.

                                       5

   6


                                   ARTICLE TEN

         The street address of the initial registered office of the Corporation
is One Dallas Centre, 350 N. St. Paul, Suite 200, Dallas, Texas 75201, and the
name of its initial registered agent at such address is Robert Maynard.

                                 ARTICLE ELEVEN

         The number of directors constituting the initial Board of Directors is
one (1) and the name and address of each person who is to serve as director
until the first annual meeting of shareholders and until such director's
successor is elected and qualified or, if earlier, until such director's death,
resignation, or removal as director, is as follows:


               NAME                                     ADDRESS
               ----                                     -------
          Robert J. Maynard                             One Dallas Centre
                                                        350 N. St. Paul
                                                        Suite 200
                                                        Dallas, Texas 75201

                                 ARTICLE TWELVE

         To the fullest extent permitted by applicable law, a director of the
Corporation shall not be liable to the Corporation or its shareholders for
monetary damages for an act or omission in the director's capacity as a
director.

         Any repeal or amendment of this Article Twelve by the shareholders of
the Corporation shall be prospective only and shall not adversely affect any
limitation on the personal liability of a director of the Corporation arising
from an act or omission occurring prior to the time of such repeal or amendment.
In addition to the circumstances in which a director of the Corporation is not
personally liable as set forth in the foregoing provisions of this Article
Twelve, a director shall not be liable to the Corporation or its shareholders to
such further extent as permitted by any law hereafter enacted, including without
limitation any subsequent amendment to the Texas Miscellaneous Corporation Laws
Act or the Texas Business Corporation Act.

                                ARTICLE THIRTEEN

         Any action which may be taken, or which is required by law or the
Articles of Incorporation or bylaws of the Corporation to be taken, at any
annual or special meeting of shareholders may be taken without a meeting,
without prior notice, and without a vote, if a consent or consents in writing,
setting forth the action so taken, shall have been signed by the holder or
holders of shares having not less than the minimum number of votes that would be
necessary to take such action at a meeting at which the holders of all shares
entitled to vote on the action were present and voted.

                                       6

   7


                                ARTICLE FOURTEEN

         The name and address of the incorporator are as follows:


            NAME                                     ADDRESS
            ----                                     -------
      Jonathan B. Newton                             c/o Baker & McKenzie
                                                     4500 Trammell Crow Center
                                                     2001 Ross Avenue
                                                     Dallas, Texas 75201



         IN WITNESS WHEREOF, I have hereunto set my hand this 20th day
of July, 1995.


                                              /s/ Jonathan B. Newton
                                              -----------------------------
                                              Jonathan B. Newton



                                       7