As filed with the Securities and Exchange Commission on March 28, 2002
                                                      Registration No. 333-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                             INTER-TEL INCORPORATED
             (Exact Name of Registrant as Specified in Its Charter)


                                                                                               
           ARIZONA                                    1615 SOUTH 52ND STREET                              86-0220994
(State or Other Jurisdiction of                          Tempe, Az 85281                               (I.R.S. Employer
 Incorporation or Organization)              (Address of Principal Executive Offices)                Identification Number)


              INTER-TEL, INCORPORATED 1997 LONG-TERM INCENTIVE PLAN
                          ACQUISITION STOCK OPTION PLAN
                            (Full Title of the Plans)

                                Steven G. Mihaylo
         Chairman of the Board of Directors and Chief Executive Officer
                             INTER-TEL INCORPORATED
                             1615 South 52nd Street
                                 Tempe, AZ 85281
                     (Name and Address of Agent for Service)

                                 (480) 449-8900
          (Telephone Number, Including Area Code, of Agent for Service)

                                   COPIES TO:

                               Robert G. Day, Esq.
                               Caine T. Moss, Esq.
                        Wilson Sonsini Goodrich & Rosati
                            Professional Corporation
                               650 Page Mill Road
                               Palo Alto, CA 94304
                                 (650) 493-9300



                                               CALCULATION OF REGISTRATION FEE
=============================================================================================================================
                                                                PROPOSED MAXIMUM       PROPOSED MAXIMUM
                                              AMOUNT TO        OFFERING PRICE PER     AGGREGATE OFFERING         AMOUNT OF
TITLE OF SECURITIES TO BE REGISTERED       BE REGISTERED (1)        SHARE (2)                PRICE           REGISTRATION FEE
-----------------------------------------------------------------------------------------------------------------------------
                                                                                                 
Common Stock, $0.0001 par value,
  to be issued under the:
Inter-Tel, Incorporated 1997 Long Term
  Incentive Plan......................         1,854,161             $17.05             $31,613,445.05          $2,908.44
Acquisition Stock Option Plan.........           150,000             $17.05             $ 2,557,500.00          $  235.29
-----------------------------------------------------------------------------------------------------------------------------
TOTALS................................         2,004,161             $17.05             $34,170,945.05          $3,143.73
=============================================================================================================================

(1)  Pursuant  to Rule 416  promulgated  under the  Securities  Act of 1933,  as
     amended, (the "Securities  Act") this  registration  statement is deemed to
     include additional shares of the Registrant's common stock to be offered or
     issued pursuant to the anti-dilution provisions of the plan listed above.
(2)  Estimated in accordance  with Rule 457(h) under the  Securities  Act solely
     for the purpose of calculating the  registration  fee based on the price of
     $17.05 per share, which was the average of the high and low price per share
     of the Common Stock as reported on the Nasdaq  National Market on March 27,
     2002 (the "Market Price").

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                             INTER-TEL, INCORPORATED

                       REGISTRATION STATEMENT ON FORM S-8

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

     Inter-Tel  Incorporated (the "Registrant")  previously filed a Registration
Statement on Form S-8 with the  Securities  and Exchange  Commission on or about
March 12, 2001 (SEC File No.  33-56872) (the "Previous Form S-8").  The Previous
Form S-8 was filed in connection with the Registrant's  Acquisition Stock Option
Plan.  This   Registration   Statement   registers   additional  shares  of  the
Registrant's Common Shares to be issued pursuant to the Acquisition Stock Option
Plan (the  "Plan").  The contents of the Previous Form S-8,  including  periodic
reports  that the Company  filed,  or to be filed,  after the  previous  S-8, to
maintain current  information  about the Company,  are incorporated by reference
into this Registration Statement pursuant to General Instruction E of Form S-8.

ITEM 3. INFORMATION INCORPORATED BY REFERENCE.

     There are hereby  incorporated by reference in this Registration  Statement
the following documents and information heretofore filed with the Securities and
Exchange Commission (the "SEC"):

          (a) The description of the Registrant's  Common Stock contained in the
     Registrant's  Registration  Statement on Form 8-A dated  February 26, 1982,
     filed  pursuant to Section 12 of the  Securities  Exchange Act of 1934,  as
     amended (the "Exchange  Act"),  including any amendment or report filed for
     the purpose of updating such description.

          (b) The  Company's  Annual  Report on Form 10-K filed with the SEC for
     the fiscal  year ended  December  31,  2001 filed with the SEC on March 25,
     2002.

          (c) The  Company's  Quarterly  Reports on Form 10-Q filed with the SEC
     for the fiscal  quarter  ended March 31, 2001,  June 30, 2001 and September
     30, 2001.

          (d) All  documents  subsequently  filed  by the  Company  pursuant  to
     Sections  13(a),  13(c), 14 and 15(d) of the Exchange Act after the date of
     this  Registration  Statement  and prior to the filing of a  post-effective
     amendment that indicates that all securities offered have been sold or that
     deregisters  all securities  then remaining  unsold,  shall be deemed to be
     incorporated  by reference in this  Registration  Statement  and to be part
     hereof from the date of filing such documents. Any statement contained in a
     document  incorporated or deemded to be  incorporated  by reference  herein
     shall  be  deemed  to be  modified  or  superseded  for  purposes  of  this
     Registration  Statement to the extent that a statement  contained herein or
     in any other  subsequently filed document which also is or is deemded to be
     incorporated by reference herein modifies or supersedes such statement. Any
     statement  so  modified  or  superseded  shall not be deemed,  except as so
     modified  or  superseded,   to  constitute  a  part  of  this  Registration
     Statement.

ITEM 4. DESCRIPTION OF SECURITIES.

     Not applicable.

ITEM 5. INTERESTS OF NAMED EXPERTS AND COUNSEL.

     Not applicable.

ITEM 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Our  Restated  Articles  of  Incorporation  limit,  to the  maximum  extent
permitted by Arizona law, the personal  liability of our  directors for monetary
damages  for  breach of their  fiduciary  duties  as a  director.  Our  Restated
Articles of  Incorporation  provide  that we shall  indemnify  our  officers and
directors to the fullest extent permitted by law, subject to certain exceptions.
We have entered into indemnification  agreements with our officers and directors
containing  provisions  which are in some  respects  broader  than the  specific
indemnification  provisions  contained  in the  Arizona  Revised  Statutes.  The
indemnification agreements may require us, among other things, to indemnify such
officers and directors  against certain  liabilities that may arise by reason of
their status or service as directors or officers (other than liabilities arising
from willful  misconduct,  gross  negligence or other conduct  proscribed by the
Arizona Revised Statutes), to advance their expenses incurred as a result of any
proceeding  against  them as to which they could be  indemnified,  and to obtain

directors' and officers' insurance, if available on reasonable terms. We believe
that these agreements are necessary to attract and retain  qualified  persons as
directors and officers.

     At present,  there is no pending  litigation  or  proceeding  involving any
director,  officer,  employee  or agent of ours  where  indemnification  will be
required  or  permitted.  We are  not  aware  of any  threatened  litigation  or
proceeding which may result in a claim or such indemnification.

     We currently maintain directors' and officers' liability insurance.

     Insofar as indemnification for liabilities arising under the Securities Act
may be  permitted  to  directors,  officers  or  persons  controlling  Inter-Tel
pursuant to the foregoing provisions,  we have been informed that in the opinion
of the SEC such  indemnification  is against  public  policy as expressed in the
Securities Act and is therefore unenforceable.

ITEM 7. EXEMPTION FROM REGISTRATION CLAIMED.

     Not applicable.

ITEM 8. EXHIBITS.

     Exhibit
     Number
     ------
      4.1      Inter-Tel, Incorporated 1997 Long-Term Incentive Plan, as amended
      5.1      Opinion of John L. Gardner, General Counsel
      23.1     Consent of Independent Auditors
      23.2     Consent of Counsel (contained in Exhibit 5.1)
      25.1     Power of Attorney (See page 4)


ITEM 9. UNDERTAKINGS.

     (a)  The Company hereby undertakes:

          (1) To file,  during  any  period  in which  offers or sales are being
made, a post-effective  amendment to this Registration  Statement to include any
material  information  with respect to the plan of  distribution  not previously
disclosed  in  the  Registration  Statement  or  any  material  change  to  such
information in the Registration Statement.

          (2) That,  for the  purpose of  determining  any  liability  under the
Securities Act, each such  post-effective  amendment shall be deemed to be a new
Registration  Statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

          (3) To remove from registration by means of a post-effective amendment
any of the securities being registered which remain unsold at the termination of
the offering.

     (b) The Company hereby  undertakes  that,  for purposes of determining  any
liability  under the  Securities  Act,  each  filing of a report by the  Company
pursuant  to Section  13(a) or Section  15(d) of the  Exchange  Act (and,  where
applicable,  each filing of an employee benefit plan's annual report pursuant to
Section  15(d) of the  Exchange  Act) that is  incorporated  by reference in the
Registration  Statement  shall  be  deemed  to be a new  Registration  Statement

                                      -2-

relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     (c) Insofar as indemnification for liabilities arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
Company pursuant to the foregoing provisions, or otherwise, the Company has been
advised that in the opinion of the SEC such  indemnification  is against  public
policy as expressed in the Securities Act and is, therefore,  unenforceable.  In
the event that a claim for indemnification  against such liabilities (other than
the payment by the Company of expenses  incurred or paid by a director,  officer
or controlling  person of the Company in the  successful  defense of any action,
suit or proceeding) is asserted by such director,  officer or controlling person
in connection with the securities being registered,  the Company will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against  public policy as expressed in the  Securities
Act and will be governed by the final adjudication of such issue.

                                      -3-

                                   SIGNATURES

     Pursuant  to  the  requirements  of  the  Securities  Act,  the  Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-8 and has  duly  caused  this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the City of Tempe, State of Arizona,  on this 27th day of March,
2002.

                                      INTER-TEL, INC.


                                      By: /s/ Kurt R. Kneip
                                          --------------------------------------
                                          Kurt R. Kneip


                                POWER OF ATTORNEY

     KNOW ALL  PERSONS  BY THESE  PRESENTS,  that each  person  whose  signature
appears below hereby constitutes and appoints Kurt R. Kneip and John L. Gardner,
and each of them acting individually, as his or her attorney-in-fact,  each with
full power of  substitution,  for him or her in any and all capacities,  to sign
any and all amendments to this  Registration  Statement on Form S-8, and to file
the same,  with exhibits  thereto and other  documents in connection  therewith,
with  the  SEC,   hereby   ratifying  and  confirming  all  that  each  of  said
attorneys-in-fact,  or any  substitute,  may do or  cause  to be done by  virtue
hereof.

     Pursuant to the  requirements  of the  Securities  Act,  this  Registration
Statement has been signed by the following  persons in the capacities and on the
dates indicated:

          SIGNATURE                         TITLE                      DATE
          ---------                         -----                      ----

     /s/ Steven G. Mihaylo         Chairman of the Board,         March 27, 2002
-------------------------------    President and Chief
       Steven G. Mihaylo           Executive Officer

        /s/ Norman Stout           Executive Vice President       March 27, 2002
-------------------------------    and Chief Administrative
          Norman Stout             Officer

      /s/ Craig W. Rauchle         Executive Vice President       March 27, 2002
-------------------------------    and Chief Operating
        Craig W. Rauchle           Officer

       /s/ Kurt R. Kneip           Chief Financial Officer        March 27, 2002
-------------------------------
         Kurt R. Kneip

     /s/ J. Robert Anderson        Director                       March 27, 2002
-------------------------------
       J. Robert Anderson

      /s/ Jerry W. Chapman         Director                       March 27, 2002
-------------------------------
        Jerry W. Chapman

         /s/ Gary Edens            Director                       March 27, 2002
-------------------------------
           Gary Edens

      /s/ C. Roland Haden          Director                       March 27, 2002
-------------------------------
        C. Roland Haden

                                      -4-

                                INDEX TO EXHIBITS

EXHIBIT
NUMBER                         DESCRIPTION
------                         -----------
 4.1           Inter-Tel, Incorporated 1997 Long-Term Incentive Plan, as amended
 5.1           Opinion of John L. Gardner, General Counsel
 23.1          Consent of Independent Auditors
 23.2          Consent of Counsel (contained in Exhibit 5.1)
 25.1          Power of Attorney (See page 4)