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Exhibit 10.58 (COMERICA LOGO)
    
    MODIFICATION TO
CREDIT AGREEMENT
 This Modification to Credit Agreement (this Modification) is entered into by and
between VODAVI COMMUNICATIONS SYSTEMS, INC., an Arizona corporation (Borrower) and COMERICA BANK,
successor by merger to Comerica Bank-California, whose Western Division Headquarters is located at
333 West Santa Clara Street, San Jose, California 95113 (Bank) on the other hand, as of February
15, 2005. RECITALS This Modification is entered into upon the basis of the following facts and understandings of
the parties, which facts and understandings are acknowledged by the parties to be true and
accurate: WHEREAS, Bank and Borrower previously entered into that certain Credit Agreement dated April
10, 2003; NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties agree as set forth below. AGREEMENT 1. Incorporation by Reference. The Recitals and the documents referred to therein are
incorporated herein by this reference. Except as otherwise noted, the initially capitalized terms
not defined herein shall have the meaning set forth in the Agreement. 2. Modification to Credit Agreement. Subject to the satisfaction of the conditions
precedent as set forth in Section 3 hereof, the Agreement is hereby modified as set forth
below. (a) In Section 1.1 of the Agreement, the definition of Permitted Credit
Exposure shall be deleted in its entirety. (b) In Section 1.1 of the Agreement, the definition of RLC Maturity Date
shall be modified to read April 30, 2006. (c) Section 6.1 (d) of the Agreement shall be deleted in its entirety. (d) Section 6.1 (e) of the Agreement shall be deleted in its entirety. 3. Legal Effect. Except as specifically set forth in this Modification, all of the
terms and conditions of the Credit Agreement remain in full force and effect. Except as expressly
set forth herein, the execution, delivery, and performance of this Modification shall not operate
as a waiver of, or as an amendment of, any right, power, or remedy of Bank under the Credit
Agreement, as in effect prior to the date hereof. Borrower ratifies and reaffirms the continuing
effectiveness of all Credit Agreements, guaranties, security agreements, mortgages, deeds of trust,
environmental agreements, and all other instruments, documents and agreements entered into in
connection with the Credit Agreement. Borrower represents and warrants that the Representations
and Warranties contained in the Agreement are true and correct as of the date of this Modification,
and that no Event of Default has occurred and is continuing. The effectiveness of this
Modification and each of the documents, instruments and agreements entered into in connection with
this Modification, including without limit any replacement Credit Agreement entered into in
connection herewith, is conditioned upon receipt by Bank of this Modification, any other documents
which Bank may require to carry out the terms hereof, and including but not limited to each of the
following:




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4. Miscellaneous Provisions. (a) This is an integrated Modification and supersedes all prior negotiations and
agreements regarding the subject matter hereof. All amendments hereto must be in writing
and signed by the parties. (b) This Modification may be executed in two or more counterparts, each of which shall
be deemed an original, but all of which together shall constitute one instrument. IN WITNESS WHEREOF, the parties have agreed as of the date first set forth above. (Borrower)
    
    (Bank)VODAVI COMMUNICATIONS SYSTEMS, INC., anArizona corporation
    
    COMERICA BANK
 By:
    

/s/
David A. Husband
    
    By:
    

/s/
Ramon T. PerezName:
    

David
A. Husband
    
    Name:
    

Ramon
T. PerezTitle:
    
    Chief Financial Officer
    
    Title:
    
    Vice President
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