EXHIBIT 10.13

ACKNOWLEDGMENT, CONSENTAND REAFFIRMATION OF GUARANTOR OF LEASE

THIS
ACKNOWLEDGMENT, CONSENT AND REAFFIRMATION OF GUARANTOR OF LEASE (the Consent), is made
this 14th day of July, 2006, by PREMIERE GLOBAL SERVICES, INC. (Guarantor), to and for the
benefit of 3280 PEACHTREE I LLC (Landlord).

WITNESSETH:

WHEREAS,
Guarantor did duly execute and deliver that certain Guaranty of Lease (the Original
Guaranty), on October 28,  2005, in connection with and as a material inducement for that
certain Lease Agreement, as may have been amended previously (the Original Lease),
involving Landlord and American Teleconferencing Services, Ltd. d/b/a Premiere Global
Services (Tenant).

WHEREAS,
Landlord and Tenant have entered into an amendment to the Original Lease (the Lease
Amendment), dated, July 14, 2006 subject to and conditioned upon the execution and delivery of
this Consent.

WHEREAS,
Landlord would not have entered into or agreed to the Lease Amendment, were it not for
the execution and delivery of this Consent to Landlord, which Consent was a material
inducement to Landlord to enter into the Lease Amendment.

WHEREAS,
Guarantor, which will derive material and substantial benefit from the Lease Amendment,
desires to provide this Consent, in connection with the Lease Amendment.

NOW
THEREFORE, for and in consideration of the mutual covenants contained herein, and for Ten
and No/100 Dollars ($10.00) and other good and valuable consideration, paid by the
parties hereto to one another, the receipt and sufficiency of which are acknowledged by
the parties hereto, the parties hereto hereby covenant and agree as follows:

1.
      Amendment to Lease. Guarantor hereby acknowledges and consents to the fact that the
Original Lease has been modified and amended by virtue of the Lease Amendment.

2.
      No Modification.  The granting of this Consent by Guarantor to Landlord and Tenant
in no way modifies or amends the Guaranty or any Guarantors obligations and duties under
the Guaranty. Said Guaranty is and shall remain in full force and effect and is a valid
and continuing obligation of Guarantor according to its terms.

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3.
      Warranties and Representations. The warranties and representations made by
Guarantor in the Guaranty are made and ratified as of the date hereof with respect to
this Consent.

4.
      No Further Consent Required. The request made by Landlord herein and the giving of
this Consent by Guarantor shall in no way be or be deemed to be a waiver of Landlords
rights under the Guaranty.

5.
      Binding Nature. This Consent shall inure to the benefit of Landlord, Tenant and
their respective heirs, legal representatives, successors and assigns.

6.
      Georgia Law. This Consent has been given, and shall be construed under, the laws of
the State of Georgia.

IN
WITNESS WHEREOF, the undersigned have caused this Consent to be executed under seal and
delivered on the day and year first above written.

| | Guarantor                   
| | ------------------------------
| |                               
| | PREMIERE GLOBAL SERVICES, INC.
| |                               
| | By:                           
| | Its:                          

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