SCHEDULE 14A
                                 (Rule 14a-101)

                     INFORMATION REQUIRED IN PROXY STATEMENT

                            SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Filed by the Registrant  / /
Filed by a party other than the Registrant /x/

Check the appropriate box:
/ / Preliminary Proxy Statement
/ / Confidential, for the use of the Commission only (as permitted by
    Rule 14a-6(e)(2))
/ / Definitive Proxy Statement
/ / Definitive Additional Materials
/x/ Soliciting Material under ss.240.14a-12

                             INTER-TEL, INCORPORATED
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                (Name of Registrant as Specified In Its Charter)


                                STEVEN G. MIHAYLO
                         SUMMIT GROWTH MANAGEMENT LLC
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    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):
/x/     No fee required.
/ /     Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
(1)     Title of each class of securities to which transaction applies:

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(2)     Aggregate number of securities to which transaction applies:

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(3)     Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
        filing fee is calculated and state how it was determined):

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(4)     Proposed maximum aggregate value of transaction:

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(5)     Total fee paid:

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/ /     Fee paid previously with preliminary materials.

/ /     Check box if any part of the fee is offset as provided by Exchange
        Act Rule 0-11(a)(2) and identify the filing for which the offsetting
        fee was paid previously. Identify the previous filing by registration
        statement number, or the Form or Schedule and the date of its filing.

(1)     Amount previously paid:

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(2)     Form, Schedule or Registration Statement No.:

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(3)     Filing party:

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(4)     Date filed:

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         On May 5, 2006, Steven G. Mihaylo ("Mr. Mihaylo") announced that he is
withdrawing the proxy solicitation by himself and Summit Growth Management LLC
("Summit") with respect to Inter-Tel, Incorporated (the "Company"). The
following is a copy the Settlement Agreement (the "Settlement Agreement")
entered into by and among Mr. Mihaylo, Summit, and the Company. Also included
in this filing is a copy of a press release issued on May 5, 2006, and a copy of
the confidentiality agreement entered into between Mr. Mihaylo and the Company.


                              SETTLEMENT AGREEMENT

         This Settlement Agreement (this "Agreement"), dated as of May 5, 2006
(the "Effective Date"), is entered into among Inter-Tel, Incorporated
("Inter-Tel" or the "Company"), Steven G. Mihaylo ("Mr. Mihaylo") and Summit
Growth Management LLC, a wholly owned affiliate of Mr. Mihaylo ("Summit"). Each
of the Company, Mr. Mihaylo and Summit are referred to individually as a
"Party" and collectively as the "Parties".

         WHEREAS, on March 6, 2006, Mr. Mihaylo filed a Schedule 13D with the
Securities and Exchange Commission (the "SEC"), which has been amended twice,
most recently on April 21, 2006 (collectively the "Schedule 13D"). In the
Schedule 13D, Mr. Mihaylo states that he is the beneficial owner of 5,179,498
shares of Company common stock, or approximately 19.6% of the outstanding
shares and that he has been discussing a possible arrangement with Vector
Capital Corporation ("Vector") to purse an acquisition of the Company.

         WHEREAS, on April 7, 2006, in accordance with the Company's recently
adopted advance notice bylaw provisions, Mr. Mihaylo notified the Company of
his intent to nominate three persons for election to the Company's board of
directors (the "Board") at the Annual Meeting (as defined below) and to make
six proposals for approval at the Annual Meeting (the "Mihaylo Resolutions").

         WHEREAS, on April 10, 2006, Mr. Mihaylo made a filing with the SEC
under Schedule 14A which (a) contained, among other things, the text of a press
release issued by Mr. Mihaylo announcing that he had requested that the Board
meet with him to discuss a possible all-cash acquisition of the Company led by
Mr. Mihaylo and the text of April 3, 2006 and April 10, 2006 letters from Mr.
Mihaylo to the Board regarding such a possible acquisition and (b) disclosed
that he had delivered to the Board the advance notices of director nominations
and shareholder business.

         WHEREAS, on April 10, 2006, the Company filed a preliminary proxy
statement under Schedule 14A for the annual meeting of stockholders to be held
on May 31, 2006 (including any adjournment or postponement thereof, the "Annual
Meeting"), as amended on April 28, 2006, in which the Company proposed the
election of eight nominees as directors, submitted two proposals for
shareholder approval (the "Company Proposals"), and requested that the
shareholders ratify the selection of accountants.

         WHEREAS, on April 21, 2006, Mr. Mihaylo and Summit filed preliminary
proxy materials under Schedule 14A for the Annual Meeting in which they
proposed the election of three nominees for directors, submitted the Mihaylo
Resolutions, and recommended that shareholders vote for the election of the
three nominees, for the Mihaylo Resolutions and the ratification of auditors
and against the two proposals submitted by the Company.

         WHEREAS, the advisors of the Company and Mr. Mihaylo have met to
discuss a potential resolution of the proxy solicitation.

         WHEREAS, in order to facilitate such discussions and to resolve the
proxy solicitation, the parties have agreed to enter into this Agreement.

         NOW, THEREFORE, in consideration of the premises and for other good
and valuable consideration, the receipt and adequacy of which are hereby
acknowledged, the parties, intending to be legally bound hereby, agree as
follows:

         1. With respect to the election of directors:

            (a) The Board agrees to nominate and recommend the election of Mr.
Mihaylo, Anil K. Puri and Kenneth L. Urish (the "Mihaylo Nominees") as part of
the Company's slate of eleven (11) directors to be elected at the Annual
Meeting. The Board's proxies and Mr. Mihaylo will vote equally all of the
shares they are entitled to vote at the Annual Meeting for Company's eight
nominees and the Mihaylo Nominees (or their replacements chosen pursuant to
Section 1(b) below). Mr. Mihaylo agrees that he will not give notice of his
intention to cumulate his votes at the Annual Meeting.

            (b) The Board agrees that if a Mihaylo Nominee shall be unable or
unwilling to serve as a nominee or a director for any reason prior to his
election as a director in accordance with this Agreement, then Mr. Mihaylo
shall be entitled to designate another person reasonably acceptable to the
Corporate Governance and Nominating Committee and a majority of the members of
the entire Board, and any such person shall become a "Mihaylo Nominee" for all
purposes under this Agreement, and the Board shall nominate for election or
appoint to the Board such person, as the case shall be.

            (c) The Board will use its reasonable best efforts to cause the
Annual Meeting to be held on May 31, 2006.

            (d) The Board agrees to elect the Mihaylo Nominees to the Board
effective the day after the Effective Date to serve until the Annual Meeting
and until their successors are duly elected and qualified or until their
earlier resignation, death, or removal. For purposes of disclosure only, the
Board hereby notifies Mr. Mihaylo and Summit that, until Mr. Mihaylo files a
Schedule 13D disclosing that he no longer has an intent to increase his
shareholdings or otherwise acquire the Company, the Board presently intends to
exclude, and it is agreed by Mr. Mihaylo and Summit that, subject to such
agreement not causing the Mihaylo Nominees to breach their fiduciary duties as
directors of the Company, the Board may exclude, the Mihaylo Nominees from any
discussions concerning, and from receipt of any materials regarding, the
Company's value and the strategic plan upon which such value would in part be
based, the Company's relationship with Mr. Mihaylo, and the consideration of
any proposal to acquire the Company from Mr. Mihaylo or any other person.

         2. With respect to the other business to be considered at the Annual
Meeting:

            (a) The Company will not make, or otherwise consider for business,
any proposals at the Annual Meeting other than the election of directors, the
Company Proposals, and the ratification of auditors. The Company agrees that it
will not make any references to Mr. Mihaylo or Summit in any of the Company's
soliciting materials in connection with the Annual Meeting without Mr.
Mihaylo's prior consent, which consent shall not be unreasonably withheld or
delayed.

            (b) Mr. Mihaylo hereby withdraws and rescinds his request that the
Company shareholders consider and vote upon the Mihaylo Resolutions at the
Annual Meeting. Mr. Mihaylo will terminate his proxy solicitation, and make all
appropriate filings with the SEC with respect thereto. Mr. Mihaylo agrees to
vote all shares he is entitled to vote in favor of the Company Proposals and
the ratification of auditors.

            (c) Upon the execution of this Agreement, the Parties will issue
the press release attached hereto as Exhibit A. The Parties agree that this
press release will be the only press release on the subject matter of this
Agreement and the Parties agree not to grant or participate in media interviews
regarding the subject matter of this Agreement, other than to recite that the
Settlement Agreement has been filed with the SEC.

         3. Prior to December 31, 2006, Mr. Mihaylo and Summit agree that,
other than by evaluating and making a Mihaylo Proposal (as defined below), they
will not acquire, offer or propose to acquire, or agree to acquire (except by
way of stock dividends, stock splits, reverse stock splits or other
distributions or offerings made available to holders of any common stock
generally), directly or indirectly, whether by purchase, tender or exchange
offer, through the acquisition of control of another person, by joining a
partnership, limited partnership, syndicate or other "group" (within the
meaning of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended)
or otherwise, any common stock of the Company, provided, however, that
activities other than share acquisitions in connection with evaluating and
making a Mihaylo Proposal, including, without limitation, discussions and/or
arrangements with equity and debt financing sources (other than the acquisition
of beneficial ownership of shares owned as of such date as a result of
formation of a "group") in connection therewith, are not subject to this
paragraph. Notwithstanding the forgoing, the Company acknowledges that, Mr.
Mihaylo and Summit may form a partnership, limited partnership, "group", or
other arrangement with Vector in connection with a Mihaylo Proposal. Prior to
the earlier of (a) December 31, 2006, (b) the entry by the Company into a
definitive agreement with respect to a Third Party Proposal (as defined below),
(c) the public announcement of an extraordinary corporate transaction (for
example, a material acquisition, a reorganization, an extraordinary dividend,
or a sale of significant number of shares), and (d) the submission of a Mihaylo
Request (as defined below), Mr. Mihaylo and Summit agree (i) not to publicly
make any adverse statement regarding the Company, its directors, management, or
employee personnel, its business, or the Annual Meeting, (ii) not to visit any
Company facility (other than in connection with Board, committee or shareholder
meetings scheduled to be held at a Company facility), and (iii) to notify the
Company at least five (5) business days in advance of submitting a Mihaylo
Proposal of his non-binding intent to do so and to attempt to coordinate with
the Company public disclosure thereof and the Company agrees not to publicly
make any adverse statement regarding Mr. Mihaylo and Summit. For these
purposes, the statements of Company's board of directors and executive officers
will be deemed to be statements of the Company whereas the statements of other
persons will not be considered statements of the Company.

         4. Concurrently with the execution of this Agreement, the Company and
Mr. Mihaylo are entering into the confidentiality agreement in the form
attached hereto as Exhibit B. Upon reasonable notice given to John Gardner,
Kurt Kneip, or Norman Stout, the Company agrees to provide promptly Mr. Mihaylo
and his advisors and financing sources access to the reasonable due diligence
information requested in good faith, in order to facilitate the making of an
all cash acquisition proposal for all outstanding Company shares by Mr. Mihaylo
(other than shares beneficially owned by him) accompanied by commitment letters
(subject only to customary conditions) of financial institutions of national
reputation (including Vector and RBC) demonstrating a reasonable certainty of
his ability to finance the transaction in its entirety ("Mihaylo Proposal")
prior to June 15, 2006, provided, that the term "Mihaylo Proposal" shall
include acquisition proposals, and any amendments or revisions thereto, made by
Mr. Mihaylo, whether prior to or after June 15, 2006 so long as they continue
to meet the criteria for a Mihaylo Proposal as set forth in this sentence
before this proviso.

         5. If the Board determines that the initially-submitted Mihaylo
Proposal is not in the best interests of the Company's shareholders (or fails
to make such determination within ten (10) business days of submission of the
Mihaylo Proposal), then, upon the request of Mr. Mihaylo (a) in the event the
Board fails to make such determination within such ten (10) business day
period, made within twenty (20) business days after submission of the Mihaylo
Proposal) or (b) in the event the Board determines that the Mihaylo Proposal is
not in the best interests of the Company's shareholders, made within ten (10)
business days after receipt by Mr. Mihaylo of written notice of such
determination or public announcement thereof (the "Mihaylo Request"), the
Company will promptly call a special meeting of shareholders (the "Special
Meeting") to vote on the proposals set forth in the Mihaylo Request, including,
without limitation, any proposal urging the Board to arrange for the prompt
sale of the Company to the highest bidder (the "Sell the Company Request"). The
Company will set the record date for the Special Meeting for a date within ten
(10) days of receipt of the Mihaylo Request and the date of the Special Meeting
shall be on a date chosen by the Company within sixty (60) days after receipt
of the Mihaylo Request. The Company will not contest the calling of the Special
Meeting as to the Sell the Company Request but, notwithstanding any other
provision of this Section 5, may contest the calling of the meeting for other
purposes and the submission of proposals other than the Sell the Company
Request at the Special Meeting, and the Company may oppose the Sell the Company
Request and any other proposals that are included in the Mihaylo Request.
Notwithstanding the foregoing, if, prior to the date of the Special Meeting,
the Company enters into a definitive agreement to be acquired by a third party
(a "Third Party Proposal"), then Mr. Mihaylo will agree to withdraw the Mihaylo
Request.

         6. Nothing in this Agreement shall prevent the Company from having
discussions, or entering into a definitive agreement, with respect to a Third
Party Proposal.

         7. Prior to the earlier of (a) the execution of a definitive
acquisition agreement with respect to the Mihaylo Proposal, (b) the execution
of a definitive agreement with respect to a Third Party Proposal that provides
for per share consideration higher than the consideration provided in the final
Mihaylo Proposal presented to the Company, (c) the Special Meeting, (d) August
31, 2006, (e) June 15, 2006, if the Mihaylo Proposal has not been made, or (f)
the expiration of the period in which Mr. Mihaylo is entitled to submit a
Mihaylo Request, if Mr. Mihaylo does not submit a Mihaylo Request within such
period, except as required by applicable law, the Company will not adopt a
bylaw or amend its articles or certificate of incorporation to prevent Mr.
Mihaylo from calling a Special Meeting so long as he and Summit have not sold
any of their Company shares of stock such that they then no longer own at least
ten percent (10%) of the Company's outstanding stock.

         8. If, prior to August 31, 2006, the Board enters into a definitive
acquisition agreement with respect to a Third Party Proposal that provides for
per share cash consideration higher than the cash consideration provided in the
final Mihaylo Proposal presented to the Company and Mr. Mihaylo has determined
not to make a competing proposal, then Mr. Mihaylo agrees to vote (or, if
requested, to execute proxies), or execute a written consent or consents if
shareholders of the Company are requested to vote their shares through the
execution of an action by written consent in lieu of any such annual or special
meeting of shareholders of the Company, in either case with respect to all of
the shares of common stock of the Company beneficially owned by him on the
record date of any such vote or written consent, in favor of approval of such
Third Party Proposal, provided that (a) the Board shall have recommended that
shareholders approve such proposal and not changed such recommendation (or been
precluded by the terms of such proposal from changing such recommendation) or
(b) no third party shall have publicly announced an acquisition proposal that
would provide for per share consideration higher than the consideration
provided in the Third Party Proposal.

         9. Mr. Mihaylo and Summit each represent and warrant to the Company as
follows:

            (a) Each has the power and authority to execute, deliver and carry
out the terms and provisions of this Agreement.

            (b) This Agreement has been duly and validly authorized, executed,
and delivered by each, constitutes a valid and binding obligation and agreement
of each, and is enforceable against each in accordance with its terms.

         10. The Company represents and warrants to each of Mr. Mihaylo and
Summit as follows:

            (a) The Company has the corporate power and authority to execute,
deliver and carry out the terms and provisions of this Agreement.

            (b) This Agreement has been duly and validly authorized, executed
and delivered by the Company, constitutes a valid and binding obligation and
agreement of the Company, and is enforceable against the Company in accordance
with its terms.

         11. The Parties acknowledge that remedies at law may be inadequate to
protect a Party against any actual or threatened breach of this Agreement and,
without prejudice to the rights and remedies otherwise available to the
non-breaching Party, each Party agrees to the granting of injunctive relief in
favor of the non-breaching Party without proof of irreparable harm or damages.

         12. The validity and interpretation of this Agreement shall be
governed by, and construed and enforced in accordance with, the laws of the
State of California applicable to agreements made and to be fully performed
therein (excluding the conflicts of laws rules). The state and federal courts
located within the State of California have exclusive jurisdiction over any
dispute arising out of or relating to this Agreement and the Parties hereby
submit and consent to the exercise of personal jurisdiction over each of them
by these courts.

         13. The benefits of this Agreement shall inure to the respective
successors and assigns of the Parties, and the obligations and liabilities
assumed in this Agreement by the Parties shall be binding upon their respective
successors and assigns; provided, however, that neither Mr. Mihaylo nor Summit
may assign his or its rights and obligations under this Agreement to any person
other than an affiliate without the prior written consent of the Company.

         14. If it is found in a final judgment by a court of competent
jurisdiction (not subject to further appeal) that any term or provision hereof
is invalid or unenforceable, (i) the remaining terms and provisions hereof
shall be unimpaired and shall remain in full force and effect and (ii) the
invalid or unenforceable provision or term shall be replaced by a term or
provision that is valid and enforceable and that comes closest to expressing
the intention of such invalid or unenforceable term or provision.

         15. This Agreement, including the Exhibits hereto, embodies the entire
agreement and understanding of the parties hereto and supersedes any and all
prior agreements, arrangements and understandings relating to the matters
provided for herein. No alteration, waiver, amendment, change or supplement
hereto shall be binding or effective unless the same is set forth in writing,
signed by a duly authorized representative of each Party, and may be modified
or waived only by a separate letter executed by the parties expressly so
modifying or waiving such Agreement.

         16. For the convenience of the Parties, any number of counterparts of
this Agreement may be executed by the parties hereto. Each such counterpart
shall be, and shall be deemed to be, an original instrument, but all such
counterparts taken together shall constitute one and the same Agreement.

         17. Each Party shall bear its own expenses in connection with this
Agreement.

         18. Any waiver by any party of a breach of any provision of this
Agreement shall not operate as or be construed to be a waiver of any other
breach of such provision or of any breach of any other provision of this
Agreement. The failure of any Party to insist upon strict adherence to any term
of this Agreement on one or more occasions shall not be considered a waiver or
deprive that Party of the right thereafter to insist upon strict adherence to
that term or any other term of this Agreement.

         19. All notices, demands and other communications to be given or
delivered under or by reason of the provisions of this Agreement shall be in
writing and shall be deemed to have been given (a) one (1) business day after
being sent by a nationally recognized overnight carrier to the addresses set
forth below (or to such other mailing addresses as a Party may designate by
notice to the other Parties in accordance with this section) or (b) when
actually delivered if sent by any other method that results in delivery (with
written confirmation of receipt):

                  If to the Company:

                           1615 South 52nd Street
                           Tempe, Arizona  85281
                           Attention:  Norman Stout, CEO

                  with a copy to (which shall not constitute notice):

                           Pillsbury Winthrop Shaw Pittman LLP
                           2475 Hanover Street
                           Palo Alto, California  94304
                           Attention:  Stephen Wurzburg, Esq.

and

                  If to Mr. Mihaylo or Summit:

                           P.O. Box 19790
                           Reno, Nevada 89511

                  with a copy to (which shall not constitute notice):

                           Skadden, Arps, Slate, Meagher & Flom LLP
                           300 South Grand Avenue, Suite 3400
                           Los Angeles, California  90071
                           Attention:  Brian J. McCarthy, Esq.

or to such other address as the person to whom notice is given may have
previously furnished to the others in writing in the manner set forth above.

         20. Any headings contained in this Agreement are for reference
purposes only and shall not effect in any way the meaning or interpretation of
this Agreement.

         21. In the event a Party shall bring any action to enforce or protect
any of its rights under this Agreement, the prevailing Party shall be entitled
to recover, in addition to its damages, its reasonable attorneys' fees and
costs.

         22. Upon and subject to the terms of this Agreement, each of the
Parties hereto agrees to use its or his commercially reasonable efforts to
cause to be taken, all actions, and to do, or cause to be done, and to assist
and cooperate with the other party in doing, all things necessary, proper or
advisable to consummate or make effective, in the most expeditious manner
practicable, the matters contemplated by this Agreement.

                            [signature page follows]



         IN WITNESS WHEREOF, each of the undersigned parties has executed or
caused this Agreement to be executed on the date first above written.

                                          INTER-TEL, INCORPORATED

                                          By:  /s/ Norman Stout
                                               -----------------
                                               Name:  Normal Stout
                                               Title: Chief Executive Officer


                                          /s/ Steven G. Mihaylo
                                          ---------------------
                                          STEVEN G. MIHAYLO


                                          SUMMIT GROWTH
                                          MANAGEMENT LLC

                                          By:  /s/ Steven G. Mihaylo
                                               ---------------------
                                               Name:  Steven G. Mihaylo
                                               Title: Managing Member



                        INTER-TEL AND STEVEN G. MIHAYLO
               REACH AGREEMENT TO SETTLE POTENTIAL PROXY CONTEST


TEMPE, AZ, May 5, 2006 - Inter-Tel, Incorporated (Nasdaq: INTL and "the
Company") and Steven G. Mihaylo, Inter-Tel's founder, former Chairman and Chief
Executive Officer and largest shareholder, announced today that they have
entered into an agreement that will settle a potential proxy contest in
connection with the Inter-Tel 2006 Annual Meeting of Shareholders. A copy of
this agreement will be filed with the Securities and Exchange Commission (SEC)
and will be available from Inter-Tel as set forth below under "Additional
Information."

In addition to other related issues, the agreement specifically stipulates
that:

     o    Inter-Tel will immediately appoint Mr. Mihaylo, Dr. Anil K. Puri and
          Kenneth L. Urish to the Company's Board of Directors, and the Board
          will be increased from 8 to 11 directors

     o    Inter-Tel will nominate and recommend these 11 directors for
          re-election to the Board of Directors at the 2006 Annual Meeting

     o    Mr. Mihaylo will withdraw his proxy solicitation for the 2006 Annual
          Meeting, including his shareholder proposals, and vote in favor of
          the slate of 11 directors nominated by Inter-Tel and the other
          proposals presented by the Company

     o    With respect to his interest in considering whether to make an
          acquisition proposal, Inter-Tel will provide Mr. Mihaylo with access
          to due diligence subject to a non-disclosure agreement and if such a
          proposal is made, a Special Committee of the Inter-Tel Board that
          excludes Mr. Mihaylo, Dr. Puri and Mr. Urish agrees to review it in a
          timely manner. Mr. Mihaylo agrees to a "stand-still" provision under
          the terms described in the agreement, subject to his right to a call
          a special meeting of stockholders if any acquisition proposal
          submitted by him meeting certain criteria is rejected by the Board or
          not acted upon in a timely manner.

As previously announced, the Inter-Tel 2006 Annual Meeting of Shareholders will
be held on May 31, 2006. Based on the agreement, Inter-Tel will re-file an
amended proxy statement with the SEC.

About Inter-Tel, Incorporated

Inter-Tel offers value-driven communications products; applications utilizing
networks and server-based communications software; and a wide range of managed
services that include voice and data network design and traffic provisioning,
custom application development, and financial solutions packages. An
industry-leading provider focused on the communication needs of business
enterprises, Inter-Tel employs nearly 2,000 communications professionals, and
services business customers through a network of 60 company-owned, direct sales
offices and over 350 authorized providers in North America, Europe, Australia
and South Africa. More information is available at www.inter-tel.com.

Additional Information

In connection with its 2006 annual meeting of stockholders, Inter-Tel
Incorporated filed a notice of annual meeting and preliminary proxy statement
with the Securities and Exchange Commission ("SEC"), as amended on April 28,
2006. STOCKHOLDERS OF INTER-TEL ARE URGED TO READ THE NOTICE OF ANNUAL MEETING
AND DEFINITIVE PROXY STATEMENT AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE
SEC WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION.
Investors and stockholders can obtain free copies of the notice of annual
meeting and definitive proxy statement and other documents when they become
available by contacting investor relations at investorrelations@inter-tel.com,
or by mail at Inter-Tel Incorporated Investor Relations, 1615 South 52nd
Street, Tempe, Arizona 85281, or by telephone at 1-480-449-8900. In addition,
documents filed with the SEC by Inter-Tel are available free of charge at the
SEC's website at www.sec.gov.

Inter-Tel and its directors and executive officers may be deemed to be
participants in the solicitation of proxies from the stockholders of Inter-Tel
in connection with the 2006 annual meeting of stockholders. Information
regarding the special interests of these directors and executive officers in
the proposed election of directors is included in Inter-Tel's notice of annual
meeting and preliminary proxy statement for its 2006 annual meeting as
described above. This document will be available free of charge at the SEC's
website at www.sec.gov and from Investor Relations at Inter-Tel as described
above.

Safe Harbor

This news release contains forward-looking statements within the meaning of
Section 27A of the Securities Act of 1933 and Section 21E of the Securities
Exchange Act of 1934. Any statements that are not statements of historical fact
(including statements containing the words "believes," "plans," "anticipates,"
"expects," "estimates" and similar expressions) should also be considered to be
forward-looking statements. Such statements are based on current assumptions
that involve risks and uncertainties that could cause actual outcomes and
results to differ materially from our current expectations. These risks and
uncertainties include, but are not necessarily limited to, the risks and
uncertainties, please see the Company's previously filed SEC reports, including
the Company's Annual Report on Form 10-K filed March 16, 2006, Form 10-Q filed
on November 9, 2005 and Current Reports on Form 8-K. Inter-Tel disclaims any
intention or obligation to update or revise any forward-looking statements,
whether as a result of new information, future events or otherwise.

Contacts:

Inter-Tel: Kurt Kneip, CFO, and Norman Stout, CEO, 480-449-8900




                           CONFIDENTIALITY AGREEMENT

                                                                May 5, 2006

Steven G. Mihaylo
P.O. Box 19790
Reno, NV 89511


         In connection with your consideration of a possible acquisition of or
business combination with (the "Transaction") Inter-Tel, Incorporated (the
"Company"), we have agreed to provide to each other and our respective
Representatives (as defined below) certain non-public information regarding the
Company and you. In consideration of, and as a condition to, such information
and any other information (whether in oral or written form, electronically
stored or otherwise) being furnished to each of us or any of our affiliates,
directors, officers, employees, advisors (including, without limitation,
financial advisors, financing sources, attorneys and accountants), agents,
representatives or "controlling persons" (within the meaning of the Securities
Exchange Act of 1934, as amended (the "1934 Act")) who are actively and
directly participating in the evaluation of the proposed Transaction and the
exchange of information (such persons for either you or the Company being
herein referred to collectively as "Representatives") about either of us or
about any third party (which information was provided subject to an applicable
confidentiality obligation to such third party) in connection with the
consideration of a Transaction (such information, along with any such
information previously provided, being herein referred to as "Evaluation
Material"), each of us agrees as follows:

     1.   Each of us and our respective Representatives (i) will use the
          Evaluation Material solely for the purpose of evaluating a possible
          Transaction with the Company involving you or your affiliates and
          (ii) will keep the Evaluation Material strictly confidential and will
          not (except as required by applicable law, regulation or legal
          process, and only after compliance with paragraph 3 below, or as
          otherwise provided in this letter agreement), without the other's
          prior written consent, disclose or reveal any information in the
          Evaluation Material, except that the Evaluation Material (or portions
          thereof) may be disclosed to those of our respective Representatives
          (including our respective officers, directors, partners, employees,
          agents, related investment funds, potential financing sources and
          advisors) who require access to such information for the purpose of
          evaluating a possible Transaction with the Company (it being
          understood that prior to such disclosure each of our Representatives
          will be informed of the confidential nature of the Evaluation
          Material and each of our Representatives (other than attorneys and
          members of the Company's Board of Directors) shall agree to be bound
          by this Agreement by signing an undertaking to the effect of Annex
          A). Each of us agrees to be responsible for any breach of this
          Agreement by our respective Representatives.

     2.   The term "Evaluation Material" does not include any information that
          (i) at the time of disclosure or thereafter is generally known by the
          public (other than as a result of its disclosure by the receiving
          party or its Representatives in breach of this Agreement), (ii) was
          or becomes available to the receiving party on a non-confidential
          basis from a person not known by the receiving party after reasonable
          inquiry to be otherwise bound by a confidentiality agreement with the
          other party or its Representatives or otherwise prohibited from
          transmitting the information to the receiving party or (iii) was
          independently derived by the receiving party without aid, application
          or use of any of the Evaluation Material. As used in this Agreement,
          the term "person" shall be broadly interpreted to include, without
          limitation, any corporation, company, joint venture, partnership or
          individual.

     3.   In the event that either of us and/or any of our respective
          Representatives are requested pursuant to, or required by, applicable
          law or regulation (including, without limitation, any rule,
          regulation or policy statement of any national securities exchange,
          market or automated quotation system) or by legal process to disclose
          any Evaluation Material or any other information concerning the other
          or a possible Transaction, the party receiving such request or legal
          process will provide the other party with prompt written notice of
          such request or requirement in order to enable the other party (i) to
          seek an appropriate protective order or other remedy with respect
          thereto, (ii) to consult with the party receiving such request or
          legal process with respect to taking steps to resist or narrow the
          scope of such request or legal process or (iii) to waive compliance,
          in whole or in part, with the terms of this letter agreement. In the
          event that such protective order or other remedy is not obtained, or
          the other party waives compliance, in whole or in part, with the
          terms of this letter agreement, the party receiving such request or
          legal process and its Representatives shall use their respective
          reasonable best efforts (A) to disclose only that portion of the
          Evaluation Material which is legally required to be disclosed and (B)
          to provide that all Evaluation Material that is so disclosed will be
          accorded confidential treatment to fullest extent available under
          applicable laws and regulations. In the event that the party
          receiving such request or legal process and/or its Representatives
          shall have complied fully with the provisions of this paragraph, then
          such party and its Representatives shall have no liability hereunder
          for the disclosure of that Evaluation Material which they are legally
          required to disclose.

     4.   To the extent that any Evaluation Material may include material
          subject to the attorney-client privilege, work product doctrine or
          any other applicable privilege concerning pending or threatened legal
          proceedings or governmental investigations, the parties understand
          and agree that they have a commonality of interest with respect to
          such matters and it is their desire, intention and mutual
          understanding that the sharing of such material is not intended to,
          and shall not, waive or diminish in any way the confidentiality of
          such material or its continued protection under the attorney-client
          privilege, work product doctrine or other applicable privilege. All
          Evaluation Material provided by a party that is entitled to
          protection under the attorney-client privilege, work product doctrine
          or other applicable privilege shall remain entitled to such
          protection under these privileges, this agreement, and under the
          joint defense doctrine. Nothing in this letter agreement obligates
          any party to reveal material subject to the attorney-client
          privilege, work product doctrine or any other applicable privilege.

     5.   Until the earlier of the consummation by you of a Transaction and one
          year from the date of this Agreement, each of us agrees not to,
          directly or indirectly, solicit for purposes of employment, offer to
          hire, entice away, or offer into any contract with any senior or key
          employee of the other, or otherwise solicit, induce or otherwise
          encourage any such person to discontinue, cancel or refrain from
          entering into any relationship (contractual or otherwise) with the
          other (other than through: (a) a general advertisement or other
          general solicitation not targeted to the Company's employees; or (b)
          through the unsolicited initiative of such employee) without the
          other's prior written consent.

     6.   Unless otherwise agreed to by the other party in writing or as
          provided in Section 4 of the Settlement Agreement (as defined below),
          all (i) communications regarding any possible Transaction, (ii)
          requests for additional information, (iii) requests for facility
          tours or management meetings, and (iv) discussions or questions
          regarding procedures, will be submitted or directed to our respective
          financial advisors, to be named in connection with a possible
          Transaction.

     7.   In addition, each party hereby acknowledges that it is aware, and
          that it will advise its respective Representatives who receive the
          Evaluation Material, that the United States securities laws generally
          prohibit any person who has material, non-public information
          concerning the matters which are the subject of this Agreement from
          purchasing or selling securities of the Company (and options,
          warrants and rights relating thereto) from communicating such
          information to any other person under circumstances in which it is
          reasonably foreseeable that such person including, without limitation
          any of our respective Representatives, is likely to purchase or sell
          such securities.

     8.   This Agreement does not constitute or create any obligation of either
          of us to provide any Evaluation Material or other information to the
          other party, but merely defines the duties and obligations of each of
          us and our respective Representatives with respect to the Evaluation
          Material to the extent it may be disclosed or made available.
          Notwithstanding the foregoing, the Company agrees to provide promptly
          to you and your Representatives access to the information requested
          in good faith, in order to facilitate the making of an acquisition
          proposal by you prior to June 15, 2006 as contemplated by Section 4
          of the Settlement Agreement. Each of us understands and acknowledges
          that neither of us nor any of our respective Representatives is
          making any representation or warranty, express or implied, as to the
          accuracy or completeness of the Evaluation Material or any other
          information provided by either of us to the other or the other's
          Representatives. Neither of us nor our respective affiliates or
          Representatives, nor any of our respective officers, directors,
          employees, agents or controlling persons (within the meaning of the
          1934 Act) shall have any liability to the other or any other person
          (including, without limitation, any of the other's Representatives)
          resulting from the use of the Evaluation Material. Each party agrees
          that it is not entitled to rely on the accuracy or completeness of
          the Evaluation Material and only those representations and warranties
          that may be made by either of us or any of our respective affiliates
          in a definitive written agreement regarding a Transaction, when, as
          and if executed and subject to the limitations and restrictions as
          may be specified therein, shall have any legal effect, and each of us
          agrees that any determination to engage in a Transaction will be
          based solely on the terms of such written agreement and on our own
          respective investigation, analysis and assessment of the other.

     9.   Each of us agrees that unless and until a definitive agreement
          between the Company and you with respect to any Transaction has been
          executed and delivered, neither party hereto will be under any legal
          obligation of any kind whatsoever with respect to such a Transaction
          by virtue of (i) this Agreement or (ii) any written or oral
          expression with respect to such a Transaction by any of the other
          party's directors, officers, employees, agents, advisors or
          Representatives except, in the case of this letter, for the matters
          specifically agreed to herein.

     10.  You agree that the Company has not granted you any license,
          copyright, or similar right with respect to any of the Evaluation
          Material or any other information provided to you by the Company or
          any of its Representatives.

     11.  If either party determines that it does not wish to proceed with the
          Transaction, then such party will promptly advise the other party and
          its financial advisors in writing of that decision (electronic mail
          shall suffice). In that case, or in the event that (i) a Transaction
          is not consummated by you or (ii) at any time the Company or you
          requests, the other party will promptly (a) return all of the
          Evaluation Material, including all copies, reproductions, summaries,
          analyses or extracts thereof or based thereon in such party's
          possession or in the possession of any of its Representatives or (b)
          destroy all Evaluation Material in such party's possession or in the
          possession of any of its Representatives (such destruction to be
          certified by such party or its Representatives). Notwithstanding the
          return or destruction of Evaluation Material, each party will
          continue to be bound by its obligations of confidentiality and other
          obligations hereunder.

     12.  Both parties acknowledge that remedies at law may be inadequate to
          protect either party hereto against any actual or threatened breach
          of this Agreement and, without prejudice to the rights and remedies
          otherwise available to the non-breaching party, each party agrees to
          the granting of injunctive relief in the favor of the non-breaching
          party without proof of irreparable harm or damages.

     13.  The validity and interpretation of this Agreement shall be governed
          by, and construed and enforced in accordance with, the laws of the
          State of California applicable to agreements made and to be fully
          performed therein (excluding the conflicts of laws rules).

     14.  The benefits of this Agreement shall inure to the respective
          successors and assigns of the parties hereto and of the indemnified
          parties hereunder and their successors and assigns and
          Representatives, and the obligations and liabilities assumed in this
          Agreement by the parties hereto shall be binding upon their
          respective successors and assigns.

     15.  If it is found in a final judgment by a court of competent
          jurisdiction (not subject to further appeal) that any term or
          provision hereof is invalid or unenforceable, (i) the remaining terms
          and provision hereof shall be unimpaired and shall remain in full
          force and effect and (ii) the invalid or unenforceable provision or
          term shall be replaced by a term or provision that is valid and
          enforceable and that comes closest to expressing the intention of
          such invalid or unenforceable term or provision.

     16.  This Agreement and the Settlement Agreement among the Company, Summit
          Growth Management LLC and you dated the date hereof (the "Settlement
          Agreement") embody the entire agreement and understanding of the
          parties hereto, and supersedes any and all prior agreements,
          arrangements and understandings, relating to the matters provided for
          herein. No alteration, waiver, amendment, change or supplement hereto
          shall be binding or effective unless the same is set forth in writing
          signed by a duly authorized representative of each part and may be
          modified or waived only by a separate letter executed by the Company
          and you expressly so modifying or waiving such Agreement.

     17.  For the convenience of the parties, any number of counterparts of
          this Agreement may be executed by the parties hereto. Each such
          counterpart shall be, and shall be deemed to be, an original
          instrument, but all such counterparts taken together shall constitute
          one and the same Agreement.

     18.  All obligations under this Agreement shall terminate except to the
          extent otherwise provided in this Agreement, the first anniversary of
          the date of this Agreement.

     19.  Notwithstanding any other provision of this Agreement, if the Company
          is or hereafter becomes bound by a confidentiality or similar
          agreement with any other person relating to a possible transaction
          that contains terms that are more favorable to such other person than
          the terms of this Agreement are to you, then the Company shall
          promptly notify you of such terms and this Agreement shall be deemed
          modified to incorporate all such terms.


                            [signature page follows]



         This Agreement is being delivered to you in duplicate. Kindly execute
and return one copy of this letter which will constitute our Agreement with
respect to the subject matter of this letter.

                                                  Very truly yours,
                                                  INTER-TEL, INCORPORATED

                                                  By: /s/ Norman Stout
                                                      ----------------
                                                  Norman Stout,
                                                  Chief Executive Officer

Confirmed and Agreed to
this 5 day of May, 2006.


By:   /s/ Steven G. Mihaylo
      --------------------
      STEVEN G. MIHAYLO



                                    ANNEX A
                                    -------

                                                        [date]

[PARTY]

Ladies and Gentlemen:

         Reference is made to the letter agreement, dated May 5, 2006 (the
"Agreement"), between Inter-Tel, Incorporated and Steven G. Mihaylo, a copy of
which is attached hereto.

         The undersigned hereby acknowledges and agrees that it may come into
possession of "Evaluation Material" (as such term is defined in the Agreement)
and, in consideration therefor, the undersigned, in its capacity as a
"Representative" (as such term is defined in the Agreement) of [Inter-Tel,
Incorporated/Steven G. Mihaylo], agrees to be bound by the Agreement in
accordance with its terms as though the undersigned were a party thereto. For
the avoidance of doubt, references to "you" or "your" in the Agreement will be
deemed to be references to the undersigned.


                                                 Very truly yours,

                                                 [REPRESENTATIVE]


                                                 By:___________________________
                                                     Name:
                                                     Title: