Exhibit 3.01

THIRD AMENDED AND RESTATED

BYLAWS

OF

SHORETEL, INC.

(a Delaware corporation)

As Adopted January 19, 2007

Amended as of
July 9, 2007 and November 4, 2009



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TABLE OF CONTENTS



|                                |  |                                                         |  |     
|------------------------------- |  | ------------------------------------------------------- |  | ----
|                                |  |                                                         |  | PAGE
|Article I - STOCKHOLDERS       
|                                |  |                                                        
|Section 1.1:                    |  | Annual Meetings                                         |  | 1   
|                                |  |                                                        
|Section 1.2:                    |  | Special Meetings                                        |  | 1   
|                                |  |                                                        
|Section 1.3:                    |  | Notice of Meetings                                      |  | 1   
|                                |  |                                                        
|Section 1.4:                    |  | Adjournments                                            |  | 1   
|                                |  |                                                        
|Section 1.5:                    |  | Quorum                                                  |  | 2   
|                                |  |                                                        
|Section 1.6:                    |  | Organization                                            |  | 2   
|                                |  |                                                        
|Section 1.7:                    |  | Voting; Proxies                                         |  | 2   
|                                |  |                                                        
|Section 1.8:                    |  | Fixing Date for Determination of Stockholders of Record |  | 2   
|                                |  |                                                        
|Section 1.9:                    |  | List of Stockholders Entitled to Vote                   |  | 3   
|                                |  |                                                        
|Section 1.10:                   |  | Inspectors of Elections                                 |  | 3   
|                                |  |                                                        
|Section 1.11:                   |  | Notice of Stockholder Business; Nominations             |  | 4   
|                                | 
|Article II - BOARD OF DIRECTORS |  |                                                        
|                                |  |                                                        
|Section 2.1:                    |  | Number; Qualifications                                  |  | 7   
|                                |  |                                                        
|Section 2.2:                    |  | Election; Resignation; Removal; Vacancies               |  | 8   
|                                |  |                                                        
|Section 2.3:                    |  | Regular Meetings                                        |  | 8   
|                                |  |                                                        
|Section 2.4:                    |  | Special Meetings                                        |  | 8   
|                                |  |                                                        
|Section 2.5:                    |  | Remote Meetings Permitted                               |  | 8   
|                                |  |                                                        
|Section 2.6:                    |  | Quorum; Vote Required for Action                        |  | 8   
|                                |  |                                                        
|Section 2.7:                    |  | Organization                                            |  | 8   
|                                |  |                                                        
|Section 2.8:                    |  | Written Action by Directors                             |  | 8   
|                                |  |                                                        
|Section 2.9:                    |  | Powers                                                  |  | 9   



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TABLE OF CONTENTS (contd)



|                         |  |                                                                            |  |     
|------------------------ |  | -------------------------------------------------------------------------- |  | ----
|                         |  |                                                                            |  | PAGE
|Section 2.10:            |  | Compensation of Directors                                                  |  | 9   
|                         | 
|Article III - COMMITTEES |  |                                                                           
|                         |  |                                                                           
|Section 3.1:             |  | Committees                                                                 |  | 9   
|                         |  |                                                                           
|Section 3.2:             |  | Committee Rules                                                            |  | 9   
|                         | 
|Article IV - OFFICERS    |  |                                                                           
|                         |  |                                                                           
|Section 4.1:             |  | Generally                                                                  |  | 9   
|                         |  |                                                                           
|Section 4.2:             |  | Chief Executive Officer                                                    |  | 10  
|                         |  |                                                                           
|Section 4.3:             |  | Chairperson of the Board                                                   |  | 10  
|                         |  |                                                                           
|Section 4.4:             |  | Lead Independent Director                                                  |  | 10  
|                         |  |                                                                           
|Section 4.5:             |  | President                                                                  |  | 11  
|                         |  |                                                                           
|Section 4.6:             |  | Vice President                                                             |  | 11  
|                         |  |                                                                           
|Section 4.7:             |  | Chief Financial Officer                                                    |  | 11  
|                         |  |                                                                           
|Section 4.8:             |  | Treasurer                                                                  |  | 11  
|                         |  |                                                                           
|Section 4.9:             |  | Controller or Principal Accounting Officer                                 |  | 11  
|                         |  |                                                                           
|Section 4.10:            |  | Secretary                                                                  |  | 11  
|                         |  |                                                                           
|Section 4.11:            |  | Delegation of Authority                                                    |  | 12  
|                         |  |                                                                           
|Section 4.12:            |  | Removal                                                                    |  | 12  
|                         | 
|Article V - STOCK        |  |                                                                           
|                         |  |                                                                           
|Section 5.l:             |  | Certificates, Uncertificated Shares                                        |  | 12  
|                         |  |                                                                           
|Section 5.2:             |  | Lost, Stolen or Destroyed Stock Certificates; Issuance of New Certificates |  | 12  
|                         |  |                                                                           
|Section 5.3:             |  | Other Regulations                                                          |  | 12  



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TABLE OF CONTENTS (contd)



|                                    |  |                                           |  |     
|----------------------------------- |  | ----------------------------------------- |  | ----
|                                    |  |                                           |  | PAGE
|Article VI - INDEMNIFICATION       
|                                    |  |                                          
|Section 6.1:                        |  | Indemnification of Officers and Directors |  | 13  
|                                    |  |                                          
|Section 6.2:                        |  | Advance of Expenses                       |  | 13  
|                                    |  |                                          
|Section 6.3:                        |  | Non-Exclusivity of Rights                 |  | 13  
|                                    |  |                                          
|Section 6.4:                        |  | Indemnification Contracts                 |  | 14  
|                                    |  |                                          
|Section 6.5:                        |  | Nature of Rights                          |  | 14  
|                                    | 
|Article VII - NOTICES               |  |                                          
|                                    |  |                                          
|Section 7.l:                        |  | Notice                                    |  | 14  
|                                    |  |                                          
|Section 7.2:                        |  | Waiver of Notice                          |  | 15  
|                                    | 
|Article VIII - INTERESTED DIRECTORS |  |                                          
|                                    |  |                                          
|Section 8.1:                        |  | Interested Directors; Quorum              |  | 15  
|                                    |  |                                          
|Section 8.2:                        |  | Quorum                                    |  | 16  
|                                    | 
|Article IX - MISCELLANEOUS          |  |                                          
|                                    |  |                                          
|Section 9.1:                        |  | Fiscal Year                               |  | 16  
|                                    |  |                                          
|Section 9.2:                        |  | Seal                                      |  | 16  
|                                    |  |                                          
|Section 9.3:                        |  | Form of Records                           |  | 16  
|                                    |  |                                          
|Section 9.4:                        |  | Reliance Upon Books and Records           |  | 16  
|                                    |  |                                          
|Section 9.5:                        |  | Certificate of Incorporation Governs      |  | 16  
|                                    |  |                                          
|Section 9.6:                        |  | Severability                              |  | 16  
|                                    | 
|Article X - AMENDMENT               |  |                                          
|                                    |  |                                          
|Section 10.1:                       |  | Amendments                                |  | 17  



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THIRD AMENDED AND RESTATED BYLAWS

OF

SHORETEL, INC.

(a Delaware corporation)

As Adopted July 9, 2007

Amended as of
July 9, 2007 and November 4, 2009

ARTICLE I

STOCKHOLDERS

Section 1.1: Annual
Meetings. An annual meeting of stockholders shall be held for the election of directors at such date and time as the Board of Directors of the Corporation (the Board) shall each year fix. The meeting may be held either
at a place, within or without the State of Delaware as permitted by the Delaware General Corporation Law (the DGCL), or by means of remote communication as the Board in its sole discretion may determine. Any proper business
may be transacted at the annual meeting.

Section 1.2: Special Meetings. Special meetings of stockholders
for any purpose or purposes may be called at any time by the Board acting pursuant to a resolution adopted by a majority of the Whole Board, which shall mean the total number of authorized directors, whether or not there
exist any vacancies in previously authorized directorships. Special meetings may not be called by any other person or persons. The special meeting may be held either at a place, within or without the State of Delaware, or by means of remote
communication as the Board in its sole discretion may determine.

Section 1.3: Notice of Meetings. Notice
of all meetings of stockholders shall be given in writing or by electronic transmission in the manner provided by law (including, without limitation, as set forth in Section 7.1(b) of these Bylaws) stating the date, time and place, if any, of
the meeting and, in the case of a special meeting, the purpose or purposes for which the meeting is called. Unless otherwise required by applicable law or the Certificate of Incorporation of the Corporation (the Certificate of
Incorporation), such notice shall be given not less than ten (10) nor more than sixty (60) days before the date of the meeting to each stockholder of record entitled to vote at such meeting.

Section 1.4: Adjournments. The chairperson of the meeting shall have the power to adjourn the meeting to another time,
date and place (if any). Any meeting of stockholders may adjourn from time to time, and notice need not be given of any such adjourned meeting if the time, date and place (if any) thereof and the means of remote communications (if any) by which
stockholders and proxy holders may be deemed to be present in person and vote at such



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adjourned meeting are announced at the meeting at which the adjournment is taken; provided, however, that if the adjournment is for more than thirty (30) days, or if after the
adjournment a new record date is fixed for the adjourned meeting, then a notice of the adjourned meeting shall be given to each stockholder of record entitled to vote at the meeting. At the adjourned meeting the Corporation may transact any business
that might have been transacted at the original meeting. To the fullest extent permitted by law, the Board may postpone or reschedule any previously scheduled special or annual meeting of stockholders before it is to be held, in which case notice
shall be provided to the stockholders of the new date, time and place, if any, of the meeting as provided in Section 1.3 above.

Section 1.5: Quorum. At each meeting of stockholders the holders of a majority of the voting power of the shares of stock entitled to vote at the meeting, present in person or represented by proxy, shall constitute a
quorum for the transaction of business, unless otherwise required by applicable law. If a quorum shall fail to attend any meeting, the chairperson of the meeting may adjourn the meeting. Shares of the Corporations stock belonging to the
Corporation (or to another corporation, if a majority of the shares entitled to vote in the election of directors of such other corporation are held, directly or indirectly, by the Corporation), shall neither be entitled to vote nor be counted for
quorum purposes; provided, however, that the foregoing shall not limit the right of the Corporation or any other corporation to vote any shares of the Corporations stock held by it in a fiduciary capacity and to count such shares
for purposes of determining a quorum.

Section 1.6: Organization. Meetings of stockholders shall be
presided over by such person as the Board may designate, or, in the absence of such a person, the Chairperson of the Board, or, in the absence of such person, the Chief Executive Officer of the Corporation, or, in the absence of such person, such
person as may be chosen by the holders of a majority of the voting power of the shares entitled to vote who are present, in person or by proxy, at the meeting. Such person shall be chairperson of the meeting and, subject to Section 1.11 hereof,
shall determine the order of business and the procedure at the meeting, including such regulation of the manner of voting and the conduct of discussion as seems to him or her to be in order. The Secretary of the Corporation shall act as secretary of
the meeting, but in such persons absence the chairperson of the meeting may appoint any person to act as secretary of the meeting.

Section 1.7: Voting; Proxies. Each stockholder entitled to vote at a meeting of stockholders may authorize another person or persons to act for such stockholder by proxy. Such a proxy
may be prepared, transmitted and delivered in any manner permitted by applicable law. Directors shall be elected by a plurality of the votes of the shares present in person or represented by proxy at the meeting and entitled to vote on the election
of directors. Unless otherwise provided by applicable law, the Certificate of Incorporation or these Bylaws, every matter other than the election of directors shall be decided by the affirmative vote of the holders of a majority of the voting power
of the shares of stock entitled to vote on such matter that are present in person or represented by proxy at the meeting and are voted for or against the matter.

Section 1.8: Fixing Date for Determination of Stockholders of Record. In order that the Corporation may determine the stockholders entitled to notice of or to vote at any meeting of
stockholders or entitled to receive payment of any dividend or other distribution or allotment of



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any rights, or entitled to exercise any rights in respect of any change, conversion or exchange of stock or for the purpose of any other lawful action, unless otherwise required by law, the Board
may fix, in advance, a record date, which shall not precede the date upon which the resolution fixing the record date is adopted by the Board and which shall not be more than sixty (60) nor less than ten (10) days before the date of such
meeting, nor more than sixty (60) days prior to any other action. If no record date is fixed by the Board, then the record date shall be as provided by applicable law. To the fullest extent permitted by law, a determination of stockholders of
record entitled to notice of or to vote at a meeting of stockholders shall apply to any adjournment of the meeting; provided, however, that the Board may fix a new record date for the adjourned meeting, in which case such new record
date shall apply to such adjourned meeting.

Section 1.9: List of Stockholders Entitled to Vote. A complete
list of stockholders entitled to vote at any meeting of stockholders, arranged in alphabetical order and showing the address of each stockholder and the number of shares registered in the name of each stockholder, shall be open to the examination of
any stockholder, for any purpose germane to the meeting, during ordinary business hours, for a period of at least ten (10) days prior to the meeting, either on a reasonably accessible electronic network as permitted by law (provided that the
information required to gain access to the list is provided with the notice of the meeting) or during ordinary business hours at the principal place of business of the Corporation. If the meeting is held at a location where stockholders may attend
in person, the list shall also be produced and kept at the time and place of the meeting during the whole time thereof and may be inspected by any stockholder who is present at the meeting. If the meeting is held solely by means of remote
communication, then the list shall be open to the examination of any stockholder during the whole time of the meeting on a reasonably accessible electronic network, and the information required to access the list shall be provided with the notice of
the meeting.

Section 1.10: Inspectors of Elections.

(a) Applicability. Unless otherwise required by the Certificate of Incorporation or required by the DGCL, the following provisions of
this Section 1.10 shall apply only if and when the Corporation has a class of voting stock that is: (i) listed on a national securities exchange; (ii) authorized for quotation on an interdealer quotation system of a registered
national securities association; or (iii) held of record by more than two thousand (2,000) stockholders; in all other cases, observance of the provisions of this Section 1.10 shall be optional, and at the discretion of the Board.

(b) Appointment. The Corporation shall, in advance of any meeting of stockholders, appoint one or more inspectors of
election to act at the meeting and make a written report thereof. The Corporation may designate one or more persons as alternate inspectors to replace any inspector who fails to act. If no inspector or alternate is able to act at a meeting of
stockholders, the person presiding at the meeting shall appoint one or more inspectors to act at the meeting.

(c)
Inspectors Oath. Each inspector of election, before entering upon the discharge of his duties, shall take and sign an oath faithfully to execute the duties of inspector with strict impartiality and according to the best of such
inspectors ability.



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(d) Duties of Inspectors. At a meeting of stockholders, the inspectors of election
shall (i) ascertain the number of shares outstanding and the voting power of each share, (ii) determine the shares represented at a meeting and the validity of proxies and ballots, (iii) count all votes and ballots,
(iv) determine and retain for a reasonable period of time a record of the disposition of any challenges made to any determination by the inspectors, and (v) certify their determination of the number of shares represented at the meeting,
and their count of all votes and ballots. The inspectors may appoint or retain other persons or entities to assist the inspectors in the performance of the duties of the inspectors.

(e) Opening and Closing of Polls. The date and time of the opening and the closing of the polls for each matter upon which the
stockholders will vote at a meeting shall be announced by the chairperson of the meeting. No ballot, proxies or votes, nor any revocations thereof or changes thereto, shall be accepted by the inspectors after the closing of the polls unless the
Court of Chancery upon application by a stockholder shall determine otherwise.

(f) Determinations. In determining the
validity and counting of proxies and ballots, the inspectors shall be limited to an examination of the proxies, any envelopes submitted with those proxies, any information provided in connection with proxies in accordance with any information
provided pursuant to Section 211(a)(2)(B) of the DGCL, or Sections 211(e) or 212(c)(2) of the DGCL, ballots and the regular books and records of the Corporation, except that the inspectors may consider other reliable information for the limited
purpose of reconciling proxies and ballots submitted by or on behalf of banks, brokers, their nominees or similar persons which represent more votes than the holder of a proxy is authorized by the record owner to cast or more votes than the
stockholder holds of record. If the inspectors consider other reliable information for the limited purpose permitted herein, the inspectors at the time they make their certification of their determinations pursuant to this Section 1.10 shall
specify the precise information considered by them, including the person or persons from whom they obtained the information, when the information was obtained, the means by which the information was obtained and the basis for the inspectors
belief that such information is accurate and reliable.

Section 1.11: Notice of Stockholder Business;
Nominations.

(a) Annual Meeting of Stockholders.

(i) Nominations of persons for election to the Board and the proposal of business to be considered by the stockholders shall be made at an
annual meeting of stockholders (A) pursuant to the Corporations notice of such meeting, (B) by or at the direction of the Board or (C) by any stockholder of the Corporation who was a stockholder of record at the time of giving
of the notice provided for in this Section 1.11, who is entitled to vote at such meeting and who complies with the notice procedures set forth in this Section 1.11.

(ii) For nominations or other business to be properly brought before an annual meeting by a stockholder pursuant to clause (C) of
subparagraph (a)(i) of this Section 1.11:

(1) the stockholder must have given timely notice thereof in writing to the
Secretary of the Corporation;



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(2) such other business must otherwise be a proper matter for stockholder action;

(3) if the stockholder, or the beneficial owner on whose behalf any such proposal or nomination is made, has provided the
Corporation with a Solicitation Notice, as that term is defined in this Section, such stockholder or beneficial owner must, in the case of a proposal, have delivered a proxy statement and form of proxy to holders of at least the percentage of the
Corporations voting shares required under applicable law to carry any such proposal, or, in the case of a nomination or nominations, have delivered a proxy statement and form of proxy to holders of a percentage of the Corporations voting
shares reasonably believed by such stockholder or beneficial holder to be sufficient to elect the nominee or nominees proposed to be nominated by such stockholder, and must, in either case, have included in such materials the Solicitation Notice;
and

(4) if no Solicitation Notice relating thereto has been timely provided pursuant to this Section, the stockholder or
beneficial owner proposing such business or nomination must not have solicited a number of proxies sufficient to have required the delivery of such a Solicitation Notice under this Section.

To be timely, a stockholders notice described above in this subparagraph (ii) must be delivered to the Secretary at the principal executive
offices of the Corporation not later than the close of business on the seventy-fifth (75th) day nor earlier than the close of business on the one hundred and fifth (105th) day prior to the first anniversary of the preceding years
annual meeting (except in the case of the 2008 annual meeting, for which such notice shall be timely if delivered in the same time period as if such meeting were a special meeting governed by subparagraph (b) of this Section 1.11);
provided, however, that in the event that the date of the annual meeting is more than thirty (30) days before or more than sixty (60) days after such anniversary date, notice by the stockholder to be timely must be so
delivered no earlier than the close of business on the one hundred and fifth (105th) day prior to such annual meeting and no later than the close of business on the later of the seventy-fifth (75th) day prior to such annual meeting or the
close of business on the tenth (10th) day following the day on which public announcement of the date of such annual meeting is first made by the Corporation. Such stockholders notice shall set forth:

(A) as to each person whom the stockholder proposes to nominate for election or reelection as a director all information
relating to such person that is required to be disclosed in solicitations of proxies for election of directors, or is otherwise required, in each case pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended (the
Exchange Act), including such persons written consent to being named in the proxy statement as a nominee and to serving as a director if elected;

(B) as to any other business that the stockholder proposes to bring before the annual meeting, a brief description of the
business desired to be brought before the meeting, the reasons for conducting such business at the meeting and any material interest in such business of such stockholder and the beneficial owner, if any, on whose behalf the proposal is made;



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(C) as to the stockholder giving the notice and the beneficial owner, if
any, on whose behalf the nomination or proposal is made (1) the name and address of such stockholder, as they appear on the Corporations books, and of such beneficial owner, (2) the class and number of shares of the Corporation that
are owned beneficially and held of record by such stockholder and such beneficial owner, (3) a description of any agreement, arrangement or understanding with respect to the nomination or proposal between or among such stockholder and such
beneficial owner, any of their respective affiliates or associates, and any others acting in concert with any of the foregoing, (4) a description of any agreement, arrangement or understanding (including any derivative or short positions,
profit interests, options, warrants, stock appreciation or similar rights, hedging transactions, and borrowed or loaned shares) that has been entered into as of the date of the stockholders notice by, or on behalf of, such stockholder and such
beneficial owners, the effect or intent of which is to mitigate loss to, manage risk or benefit of share price changes for, or increase or decrease the voting power of, such stockholder or such beneficial owner, with respect to shares of stock of
the Corporation, (5) a representation that the stockholder is a holder of record of stock of the Corporation entitled to vote at such meeting and intends to appear in person or by proxy at the meeting to propose such business or nomination, and
(6) whether either such stockholder or beneficial owner intends to deliver a proxy statement and form of proxy to holders of, in the case of a proposal, at least the percentage of the Corporations voting shares required under applicable
law to carry the proposal or, in the case of a nomination or nominations, a sufficient number of holders of the Corporations voting shares to elect such nominee or nominees (an affirmative statement of such intent being, a
Solicitation Notice). If requested by the Corporation, the information required under clauses (2), (3) and (4) of this subparagraph (ii)(C) shall be supplemented by such shareholder and beneficial owner, if any,
not later than 10 days after the record date for the meeting to disclose such information as of the record date.

(iii)
Notwithstanding anything in the second sentence of subparagraph (a)(ii) of this Section 1.11 to the contrary, in the event that the number of directors to be elected to the Board is increased and there is no public announcement by the
Corporation naming all of the nominees for director or specifying the size of the increased Board at least seventy-five (75) days prior to the first anniversary of the preceding years annual meeting (or, if the annual meeting is held more
than thirty (30) days before or sixty (60) days after such anniversary date, at least seventy-five (75) days prior to such annual meeting), a stockholders notice required by this Section 1.11 shall also be considered
timely, but only with respect to nominees for any new positions created by such increase, if it shall be delivered to the Secretary of the Corporation at the principal executive office of the Corporation no later than the close of business on the
tenth (10th) day following the day on which such public announcement is first made by the Corporation.

(b) Special
Meetings of Stockholders. Only such business shall be conducted at a special meeting of stockholders as shall have been brought before the meeting pursuant to the Corporations notice of such meeting. Nominations of persons for election to
the Board may be made at a special meeting of stockholders at which directors are to be elected pursuant to the Corporations notice of such meeting (i) by or at the direction of the Board or (ii) provided that the Board has
determined that directors shall be elected at such meeting, by any stockholder of



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the Corporation who is a stockholder of record at the time of giving of notice of the special meeting, who shall be entitled to vote at the meeting and who complies with the notice procedures set
forth in this Section 1.11. In the event the Corporation calls a special meeting of stockholders for the purpose of electing one or more directors to the Board, any such stockholder may nominate a person or persons (as the case may be), for
election to such position(s) as specified in the Corporations notice of meeting, if the stockholders notice required by subparagraph (a)(ii) of this Section 1.11 shall be delivered to the Secretary of the Corporation at the
principal executive offices of the Corporation no earlier than the one hundred fifth (105th) day prior to such special meeting and no later than the close of business on the later of the seventy-fifth (75th) day prior to such special
meeting or the tenth (10th) day following the day on which public announcement is first made of the date of the special meeting and of the nominees proposed by the Board to be elected at such meeting.

(c) General.

(i) Only such persons who are nominated in accordance with the procedures set forth in this Section 1.11 shall be eligible to serve as members of the Board and only such business shall be conducted at a meeting of stockholders as shall
have been brought before the meeting in accordance with the procedures set forth in this Section 1.11. Except as otherwise provided by law or these Bylaws, the chairperson of the meeting shall have the power and duty to determine whether a
nomination or any business proposed to be brought before the meeting was made or proposed, as the case may be, in accordance with the procedures set forth in this Section 1.11 and, if any proposed nomination or business is not in compliance
herewith, to declare that such defective proposal or nomination shall be disregarded.

(ii) For purposes of this
Section 1.11, the term public announcement shall mean disclosure in a press release reported by the Dow Jones News Service, Associated Press or comparable national news service or in a document publicly filed by the
Corporation with the Securities and Exchange Commission pursuant to section 13, 14 or 15(d) of the Exchange Act.

(iii)
Notwithstanding the foregoing provisions of this Section 1.11, a stockholder shall also comply with all applicable requirements of the Exchange Act and the rules and regulations thereunder with respect to the matters set forth herein. Nothing
in this Section 1.11 shall be deemed to affect any rights of stockholders to request inclusion of proposals in the Corporations proxy statement pursuant to Rule 14a-8 under the Exchange Act.

ARTICLE II

BOARD OF DIRECTORS

Section 2.1: Number; Qualifications. The Board shall consist of one or
more members. The initial number of directors shall be eight (8) and thereafter, unless otherwise required by law, shall be fixed from time to time as set forth in the Certificate of Incorporation. No decrease in the authorized number of
directors constituting the Board shall shorten the term of any incumbent director. Directors need not be stockholders of the Corporation.



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Section 2.2: Election; Vacancies. The directors shall be divided, with
respect to the time for which they severally hold office, into classes as provided in the Certificate of Incorporation, and vacancies occurring in the Board and any newly created directorships resulting from any increase in the authorized number of
directors shall be filled, as provided in the Certificate of Incorporation.

Section 2.3: Regular Meetings.
Regular meetings of the Board may be held at such places, within or without the State of Delaware, and at such times as the Board may from time to time determine. Notice of regular meetings need not be given if the date, times and places thereof are
fixed by resolution of the Board.

Section 2.4: Special Meetings. Special meetings of the Board may be
called by the Chairperson of the Board, the Lead Independent Director, the Chief Executive Officer, or a majority of the members of the Board then in office and may be held at any time, date or place, within or without the State of Delaware, as the
person or persons calling the meeting shall fix. Notice of the time, date and place of such meeting shall be given, orally, in writing or by electronic transmission (including electronic mail), by the person or persons calling the meeting to all
directors at least four (4) days before the meeting if the notice is mailed, or at least twenty-four (24) hours before the meeting if such notice is given by telephone, hand delivery, telegram, telex, mailgram, facsimile, electronic mail
or other means of electronic transmission. Unless otherwise indicated in the notice, any and all business may be transacted at a special meeting.

Section 2.5: Remote Meetings Permitted. Members of the Board, or any committee of the Board, may participate in a meeting of the Board or such committee by means of conference telephone
or other communications equipment by means of which all persons participating in the meeting can hear each other, and participation in a meeting pursuant to conference telephone or other communications equipment shall constitute presence in person
at such meeting.

Section 2.6: Quorum; Vote Required for Action. At all meetings of the Board a majority of
the Whole Board shall constitute a quorum for the transaction of business. If a quorum shall fail to attend any meeting, a majority of those present may adjourn the meeting to another place, date or time without further notice thereof. Except as
otherwise provided herein or in the Certificate of Incorporation, or required by law, the vote of a majority of the directors present at a meeting at which a quorum is present shall be the act of the Board.

Section 2.7: Organization. Meetings of the Board shall be presided over by the Chairperson of the Board, or in such
persons absence by the Chief Executive Officer, or in such persons absence, by a chairperson chosen at the meeting. The Secretary shall act as secretary of the meeting, but in such persons absence the chairperson of the meeting may
appoint any person to act as secretary of the meeting.

Section 2.8: Written Action by Directors. Any
action required or permitted to be taken at any meeting of the Board, or of any committee thereof, may be taken without a meeting if all members of the Board or such committee, as the case may be, consent thereto in writing or by electronic
transmission, and the writing or writings or electronic transmission or transmissions are filed with the minutes of proceedings of the Board or committee, respectively. Such filing shall be in paper form if the minutes are maintained in paper form
and shall be in electronic form if the minutes are maintained in electronic form.



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Section 2.9: Powers. The Board may, except as otherwise required by law
or the Certificate of Incorporation, exercise all such powers and do all such acts and things as may be exercised or done by the Corporation.

Section 2.10: Compensation of Directors. Members of the Board, as such, may receive, pursuant to a resolution of the Board, fees and other compensation for their services as directors,
including without limitation their services as members of committees of the Board.

ARTICLE III

COMMITTEES

Section 3.1: Committees. The Board may designate one or more committees, each committee to consist of one or more of the directors of the Corporation. The Board may designate one or more directors as alternate members of
any committee, who may replace any absent or disqualified member at any meeting of the committee. In the absence or disqualification of a member of the committee, the member or members thereof present at any meeting of such committee who are not
disqualified from voting, whether or not such member or members constitute a quorum, may unanimously appoint another member of the Board to act at the meeting in place of any such absent or disqualified member. Any such committee, to the extent
provided in a resolution of the Board, shall have and may exercise all the powers and authority of the Board in the management of the business and affairs of the Corporation and may authorize the seal of the Corporation to be affixed to all papers
that may require it; but no such committee shall have the power or authority in reference to the following matters: (i) approving or adopting, or recommending to the stockholders, any action or matter (other than the election or removal of
members of the Board) expressly required by the DGCL to be submitted to stockholders for approval or (ii) adopting, amending or repealing any bylaw of the Corporation.

Section 3.2: Committee Rules. Unless the Board otherwise provides, each committee designated by the Board may
make, alter and repeal rules for the conduct of its business not in conflict with the provisions of this Article III. In the absence of such rules each committee shall conduct its business in the same manner as the Board conducts its business
pursuant to Article II of these Bylaws.

ARTICLE IV

OFFICERS

Section 4.1: Generally.
The officers of the Corporation shall consist of a Chief Executive Officer (who may be the Chairperson of the Board) and/or a President, a Secretary, a Treasurer and may consist of such other officers, including a Chairperson of the Board, Chief
Financial Officer, one or more Vice Presidents, and a Controller, as may from time to time be appointed by the Board. All officers shall be elected by the Board; provided, however, that the Board may empower the Chief Executive Officer
of the Corporation to appoint officers other



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than the Chairperson of the Board, the Chief Executive Officer, the President, the Chief Financial Officer, the Treasurer or the Controller. Each officer shall hold office until such
persons successor is appointed or until such persons earlier resignation, death or removal. Any number of offices may be held by the same person. Any officer may resign at any time upon written notice to the Corporation. Any vacancy
occurring in any office of the Corporation by death, resignation, removal or otherwise may be filled by the Board.

Section 4.2: Chief Executive Officer. Subject to the control of the Board and such supervisory powers, if any, as may be given by the Board, the powers and duties of the Chief Executive Officer of the Corporation are:

(a) To act as the general manager and, subject to the control of the Board, to have general supervision, direction and
control of the business and affairs of the Corporation;

(b) Subject to Article I, Section 1.6, to preside at all
meetings of the stockholders;

(c) Subject to Article I, Section 1.2, to call special meetings of the stockholders to be
held at such times and, subject to the limitations prescribed by law or by these Bylaws, at such places as he or she shall deem proper; and

(d) To affix the signature of the Corporation to all deeds, conveyances, mortgages, guarantees, leases, obligations, bonds, certificates and other papers and instruments in writing which have been
authorized by the Board or which, in the judgment of the Chief Executive Officer, should be executed on behalf of the Corporation; to sign certificates for shares of stock of the Corporation; and, subject to the direction of the Board, to have
general charge of the property of the Corporation and to supervise and control all officers, agents and employees of the Corporation.

The President shall be the Chief Executive Officer of the Corporation unless the Board shall designate another officer to be the Chief Executive Officer. If there is no President, and the Board has not designated any other officer to be the
Chief Executive Officer, then the Chairperson of the Board shall be the Chief Executive Officer.

Section 4.3:
Chairperson of the Board. Subject to Article I, Section 2.7, the Chairperson of the Board shall have the power to preside at all meetings of the Board and shall have such other powers and duties as provided in these Bylaws and as the
Board may from time to time prescribe.

Section 4.4. Lead Independent Director. The Board may, in its discretion
elect a Lead Independent Director from among its members that are Independent Directors (as defined below). He or she shall preside at all meetings at which the Chaiperson of the Board is not present and shall exercise such other powers
and duties as may from time to time be assigned to him or her by the Board or as prescribed by these Bylaws. For purposes of these Bylaws, Independent Director has the meaning ascribed to such term under the rules of the Nasdaq Stock
Market or other stock exchange upon which the Corporations common stock is primarily traded.



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Section 4.5: President. The President shall be the Chief Executive
Officer of the Corporation unless the Board shall have designated another officer as the Chief Executive Officer of the Corporation. Subject to the provisions of these Bylaws and to the direction of the Board, and subject to the supervisory powers
of the Chief Executive Officer (if the Chief Executive Officer is an officer other than the President), and subject to such supervisory powers and authority as may be given by the Board to the Chairperson of the Board, and/or to any other officer,
the President shall have the responsibility for the general management and control of the business and affairs of the Corporation and the general supervision and direction of all of the officers, employees and agents of the Corporation (other than
the Chief Executive Officer, if the Chief Executive Officer is an officer other than the President) and shall perform all duties and have all powers that are commonly incident to the office of President or that are delegated to the President by the
Board.

Section 4.6: Vice President. Each Vice President shall have all such powers and duties as are
commonly incident to the office of Vice President, or that are delegated to him or her by the Board or the Chief Executive Officer. A Vice President may be designated by the Board to perform the duties and exercise the powers of the Chief Executive
Officer in the event of the Chief Executive Officers absence or disability.

Section 4.7: Chief Financial
Officer. The Chief Financial Officer shall be the Treasurer of the Corporation unless the Board shall have designated another officer as the Treasurer of the Corporation. The Chief Financial Officer shall be the principal accounting officer of
the Corporation unless the Board shall have designated a Contoller or another officer as the principal financial officer of the Corporation. Subject to the direction of the Board and the Chief Executive Officer, the Chief Financial Officer shall
perform all duties and have all powers that are commonly incident to the office of Chief Financial Officer.

Section 4.8: Treasurer. The Treasurer shall have custody of all monies and securities of the Corporation. The Treasurer shall make such disbursements of the funds of the Corporation as are authorized and shall render from
time to time an account of all such transactions. The Treasurer shall also perform such other duties and have such other powers as are commonly incident to the office of Treasurer, or as the Board or the Chief Executive Officer may from time to time
prescribe.

Section 4.8: Controller or Principal Accounting Officer. The Controller or other officer
designated by the Board shall be the principal accounting officer of the Corporation and, subject to the direction of the Chief Financial Officer, shall be responsible for maintaining the accounting records of the Corporation and for preparing
necessary financial reports and statements, and the Controller shall properly account for all monies and obligations due the Corporation and all properties, assets, and liabilities of the Corporation. The Controller shall also perform such other
duties and have such other powers as are commonly incident to the office of Controller, or as the Board or the Chief Financial Officer may from time to time prescribe, and shall exercise the powers of the Chief Financial Officer during his absence
or inability to act.

Section 4.10: Secretary. The Secretary shall issue or cause to be issued all
authorized notices for, and shall keep, or cause to be kept, minutes of all meetings of the stockholders and



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the Board. The Secretary shall have charge of the corporate minute books and similar records and shall perform such other duties and have such other powers as are commonly incident to the office
of Secretary, or as the Board or the Chief Executive Officer may from time to time prescribe.

Section 4.11:
Delegation of Authority. The Board may from time to time delegate the powers or duties of any officer to any other officers or agents, notwithstanding any provision hereof.

Section 4.12: Removal. Any officer of the Corporation shall serve at the pleasure of the Board and may be removed at any
time, with or without cause, by the Board; provided that if the Board has empowered the Chief Executive Officer to appoint any Vice Presidents of the Corporation, then such Vice Presidents may be removed by the Chief Executive Officer. Such removal
shall be without prejudice to the contractual rights of such officer, if any, with the Corporation.

ARTICLE V

STOCK

Section 5.1: Certificates, Uncertificated Shares. The shares of capital stock of the Corporation shall be represented by certificates, provided that the Board may provide by resolution
or resolutions that some or all of any or all classes or series of its stock may be uncertificated shares. Any such resolution shall not apply to shares represented by a certificate until such certificate is surrendered to the Corporation (or the
transfer agent or registrar, as the case may be). Notwithstanding the adoption of such resolution by the Board, every holder of stock represented by certificates and, upon the request, a holder of uncertificated shares shall be entitled to have a
certificate signed by or in the name of the Corporation by the Chairperson or Vice-Chairperson of the Board, or the President or a Vice President, and by the Treasurer or an Assistant Treasurer, or the Secretary or an Assistant Secretary, of the
Corporation, certifying the number of shares owned by such stockholder in the Corporation. If such holder of uncertificated shares elects to receive a certificate, the Corporation (or the transfer agent or registrar, as the case may be) shall cease
to provide annual statements indicating such holders holding of shares in the Corporation. Any or all of the signatures on the certificate may be a facsimile.

Section 5.2: Lost, Stolen or Destroyed Stock Certificates; Issuance of New Certificates. The Corporation may issue a new certificate of stock, or uncertificated shares, in the place of
any certificate previously issued by it, alleged to have been lost, stolen or destroyed, upon the making of an affidavit of that fact by the person claiming the certificate of stock to be lost, stolen or destroyed and the Corporation may require the
owner of the lost, stolen or destroyed certificate, or such owners legal representative, to agree to indemnify the Corporation and/or to give the Corporation a bond sufficient to indemnify it, against any claim that may be made against it on
account of the alleged loss, theft or destruction of any such certificate or the issuance of such new certificate.

Section 5.3: Other Regulations. The issue, transfer, conversion and registration of stock certificates shall be governed by such other regulations as the Board may establish.



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ARTICLE VI

INDEMNIFICATION

Section 6.1
Indemnification of Officers and Directors. Each person who was or is made a party to, or is threatened to be made a party to, or is involved in any action, suit or proceeding, whether civil, criminal, administrative or investigative (a
Proceeding), by reason of the fact that such person (or a person of whom such person is the legal representative), is or was a member of the Board or officer of the Corporation or a Reincorporated Predecessor (as defined
below) or is or was serving at the request of the Corporation or a Reincorporated Predecessor as a member of the board of directors, officer or trustee of another corporation, or of a partnership, joint venture, trust or other enterprise, including
service with respect to employee benefit plans (for purposes of this Article VI, an Indemnitee), shall be indemnified and held harmless by the Corporation to the fullest extent permitted by the DGCL as the same exists or
may hereafter be amended (but, in the case of any such amendment, only to the extent that such amendment permits the Corporation to provide broader indemnification rights than such law permitted the Corporation to provide prior to such amendment),
against all expenses, liability and loss (including attorneys fees, judgments, fines, ERISA excise taxes and penalties and amounts paid or to be paid in settlement) reasonably incurred or suffered by such Indemnitee in connection therewith.
Notwithstanding the foregoing, the Corporation shall indemnify any such Indemnitee seeking indemnity in connection with a Proceeding (or part thereof) initiated by such Indemnitee only if such Proceeding (or part thereof) was authorized by the Board
or such indemnification is authorized by an agreement approved by the Board. As used herein, the term the Reincorporated Predecessor means a corporation that is merged with and into the Corporation in a statutory merger
where (a) the Corporation is the surviving corporation of such merger; (b) the primary purpose of such merger is to change the corporate domicile of the Reincorporated Predecessor to Delaware.

Section 6.2: Advance of Expenses. The Corporation shall pay all expenses (including attorneys fees) reasonably
incurred by such an Indemnitee in defending any such Proceeding as they are incurred in advance of its final disposition; provided, however, that (a) if the DGCL then so requires, the payment of such expenses incurred by
such an Indemnitee in advance of the final disposition of such Proceeding shall be made only upon delivery to the Corporation of an undertaking, by or on behalf of such Indemnitee, to repay all amounts so advanced if it should be determined
ultimately by final judicial decision from which there is no appeal that such Indemnitee is not entitled to be indemnified under this Article VI or otherwise; and (b) the Corporation shall not be required to advance any expenses to a person
against whom the Corporation directly brings a claim, in a Proceeding, alleging that such person has breached such persons duty of loyalty to the Corporation, committed an act or omission not in good faith or that involves intentional
misconduct or a knowing violation of law, or derived an improper personal benefit from a transaction.

Section 6.3:
Non-Exclusivity of Rights. The rights conferred on any person in this Article VI shall not be exclusive of any other right that such person may have or hereafter acquire under any statute, provision of the Certificate of Incorporation, Bylaw,
indemnification contract or other agreement, vote or consent of stockholders or disinterested directors, or otherwise. Additionally, nothing in this Article VI shall limit the ability of the Corporation, in its discretion, to indemnify or advance
expenses to persons whom the Corporation is not obligated to indemnify or advance expenses pursuant to this Article VI.



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Section 6.4: Indemnification Contracts. The Board is
authorized to cause the Corporation to enter into indemnification contracts with any director, officer, employee or agent of the Corporation, or any person serving at the request of the Corporation as a director, officer, employee or agent of
another corporation, partnership, joint venture, trust or other enterprise, including employee benefit plans, providing indemnification or advancement rights to such person. Such rights may be greater than those provided in this Article VI.

Section 6.5: Nature of Rights. The rights conferred upon Indemnitees in this Article VI shall be contract
rights and such rights shall continue as to an Indemnitee who has ceased to be a director, officer or trustee and shall inure to the benefit of the Indemnitees heirs, executors and administrators. Any amendment, repeal or modification of any
provision of this Article VI that adversely affects any right of an Indemnitee or an Indemnitees successors shall be prospective only, and shall not adversely affect any right or protection conferred on a person pursuant to this Article VI and
existing at the time of such amendment, repeal or modification.

ARTICLE VII

NOTICES

Section 7.1: Notice.

(a) Except as otherwise specifically required in these Bylaws (including,
without limitation, Section 7.1(b) below) or by law, all notices required to be given pursuant to these Bylaws shall be in writing and may, (a) in every instance in connection with any delivery to a member of the Board, be effectively
given by hand delivery (including use of a delivery service), by depositing such notice in the mail, postage prepaid, or by sending such notice by prepaid telegram, cablegram, overnight express courier, facsimile, electronic mail or other form of
electronic transmission and (b) be effectively be delivered to a stockholder when given by hand delivery, by depositing such notice in the mail, postage prepaid or, if specifically consented to by the stockholder as described in
Section 7.1(b) of this Article VII by sending such notice by telegram, cablegram, facsimile, electronic mail or other form of electronic transmission. Any such notice shall be addressed to the person to whom notice is to be given at such
persons address as it appears on the records of the Corporation. The notice shall be deemed given (i) in the case of hand delivery, when received by the person to whom notice is to be given or by any person accepting such notice on behalf
of such person, (ii) in the case of delivery by mail, upon deposit in the mail, (iii) in the case of delivery by overnight express courier, when dispatched, and (iv) in the case of delivery via telegram, cablegram, facsimile,
electronic mail or other form of electronic transmission, when dispatched.

(b) Without limiting the manner by which notice
otherwise may be given effectively to stockholders, any notice to stockholders given by the Corporation under any provision of the DGCL, the Certificate of Incorporation, or these Bylaws shall be effective if given by a form of electronic
transmission consented to by the stockholder to whom the notice is given in



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accordance with Section 232 of the DGCL. Any such consent shall be revocable by the stockholder by written notice to the Corporation. Any such consent shall be deemed revoked if (i) the
Corporation is unable to deliver by electronic transmission two consecutive notices given by the Corporation in accordance with such consent and (ii) such inability becomes known to the Secretary or an Assistant Secretary of the Corporation or
to the transfer agent, or other person responsible for the giving of notice; provided, however, the inadvertent failure to treat such inability as a revocation shall not invalidate any meeting or other action. Notice given pursuant to this
Section 7.1(b) shall be deemed given: (i) if by facsimile telecommunication, when directed to a number at which the stockholder has consented to receive notice; (ii) if by electronic mail, when directed to an electronic mail address
at which the stockholder has consented to receive notice; (iii) if by a posting on an electronic network together with separate notice to the stockholder of such specific posting, upon the later of (A) such posting and (B) the giving
of such separate notice; and (iv) if by any other form of electronic transmission, when directed to the stockholder.

(c)
An affidavit of the Secretary or an Assistant Secretary or of the transfer agent or other agent of the Corporation that the notice has been given in writing or by a form of electronic transmission shall, in the absence of fraud, be prima facie
evidence of the facts stated therein.

Section 7.2: Waiver of Notice. Whenever notice is required to be
given under any provision of the DGCL, the Certificate of Incorporation or these Bylaws, a written waiver of notice, signed by the person entitled to notice, or waiver by electronic transmission by such person, whether before or after the time
stated therein, shall be deemed equivalent to notice. Attendance of a person at a meeting shall constitute a waiver of notice of such meeting, except when the person attends a meeting for the express purpose of objecting at the beginning of the
meeting to the transaction of any business because the meeting is not lawfully called or convened. Neither the business to be transacted at, nor the purpose of, any regular or special meeting of the stockholders, directors or members of a committee
of directors need be specified in any waiver of notice.

ARTICLE VIII

INTERESTED DIRECTORS

Section 8.1: Interested Directors. No contract or transaction between the Corporation and one or more of its directors or officers, or between the Corporation and any other corporation,
partnership, association or other organization in which one or more of its directors or officers are directors or officers, or have a financial interest, shall be void or voidable solely for this reason, or solely because the director or officer is
present at or participates in the meeting of the Board or committee thereof that authorizes the contract or transaction, or solely because his, her or their votes are counted for such purpose, if: (i) the material facts as to his, her or their
relationship or interest and as to the contract or transaction are disclosed or are known to the Board or the committee, and the Board or committee in good faith authorizes the contract or transaction by the affirmative votes of a majority of the
disinterested directors, even though the disinterested directors be less than a quorum; (ii) the material facts as to his, her or their relationship or interest and as to the contract or transaction are disclosed or are known to the
stockholders entitled to vote thereon, and the contract or transaction is specifically approved in good faith by vote of the stockholders; or (iii) the contract or transaction is fair as to the Corporation as of the time it is authorized,
approved or ratified by the Board, a committee thereof, or the stockholders.



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Section 8.2: Quorum. Interested directors may be counted in determining
the presence of a quorum at a meeting of the Board or of a committee which authorizes the contract or transaction.

ARTICLE
IX

MISCELLANEOUS

Section 9.1: Fiscal Year. The fiscal year of the Corporation shall be determined by resolution of the Board.

Section 9.2: Seal. The Board may provide for a corporate seal, which may have the name of the Corporation inscribed
thereon and shall otherwise be in such form as may be approved from time to time by the Board.

Section 9.3:
Form of Records. Any records maintained by the Corporation in the regular course of its business, including its stock ledger, books of account and minute books, may be kept on or by means of, or be in the form of, diskettes, compact disks or
any other information storage device or method, provided that the records so kept can be converted into clearly legible paper form within a reasonable time. The Corporation shall so convert any records so kept upon the request of any person entitled
to inspect such records pursuant to any provision of the DGCL.

Section 9.4: Reliance upon Books and
Records. A member of the Board, or a member of any committee designated by the Board shall, in the performance of such persons duties, be fully protected in relying in good faith upon records of the Corporation and upon such information,
opinions, reports or statements presented to the Corporation by any of the Corporations officers or employees, or committees of the Board, or by any other person as to matters the member reasonably believes are within such other persons
professional or expert competence and who has been selected with reasonable care by or on behalf of the Corporation.

Section 9.5: Certificate of Incorporation Governs. In the event of any conflict or inconsistency between the provisions of the Certificate of Incorporation and these Bylaws, the provisions of the Certificate of
Incorporation shall govern and prevail.

Section 9.6: Severability. If any provision of these Bylaws shall
be held to be invalid, illegal, unenforceable or in conflict with the provisions of the Certificate of Incorporation, then such provision shall nonetheless be enforced to the maximum extent possible consistent with such holding and the remaining
provisions of these Bylaws (including without limitation, all portions of any section of these Bylaws containing any such provision held to be invalid, illegal, unenforceable or in conflict with the Certificate of Incorporation, that are not
themselves invalid, illegal, unenforceable or in conflict with the Certificate of Incorporation) shall remain in full force and effect.



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ARTICLE X

AMENDMENT

Section 10.1:
Amendments. Notwithstanding any other provision of these Bylaws, any amendment or repeal of these Bylaws shall require the approval of the Board or the stockholders of the Corporation as provided in the Certificate of Incorporation.







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CERTIFICATION OF

THIRD AMENDED AND RESTATED BYLAWS

OF

SHORETEL, INC.

(a Delaware corporation)

KNOW ALL BY THESE PRESENTS:

I, Ava M. Hahn, certify that I am Secretary of ShoreTel, Inc., a Delaware corporation (the Corporation), that I am
duly authorized to make and deliver this certification, that the attached Bylaws are a true and complete copy of the Third Amended and Restated Bylaws of the Corporation in effect as of the date of this certificate.



|                        |  |  |  |  |  |                       
|----------------------- |  |  |  |  |  | ----------------------
|Dated: November 4, 2009 |  |  |  |  |  |                       
|                        |  |  | 
|                        |  |  |  |  |  | /s/ Ava M. Hahn       
|                        |  |  |  |  |  | Ava M. Hahn, Secretary