EXHIBIT 10.12

FIRST AMENDMENT TO
LEASE AGREEMENT

THIS
FIRST AMENDMENT TO LEASE AGREEMENT (the First Amendment), is made this 14th day of July,
2006, by 3280 PEACHTREE I LLC (as Landlord) and AMERICAN TELECONFERENCING SERVICES,
LTD., D/B/A PREMIERE GLOBAL SERVICES (as Tenant).

W I T N E S S E T H:

WHEREAS,
Landlord and Tenant did enter into that certain Lease Agreement, dated as of October 28,
2005 (the Original Lease), for space in that certain building known as Terminus 100,
located at 3280 Peachtree Road, Atlanta, Georgia (the Building), as such space is more
particularly described in the Original Lease (the Demised Premises).

WHEREAS,
Landlord and Tenant desire to modify and amend the Original Lease, in the manner and for
the purposes herein set forth.

NOW,
THEREFOR, for and in consideration of the mutual premises, 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.
Defined Terms. All capitalized terms not defined herein shall have the same meaning
as set forth in the Original Lease.

2.
Construction Matters. Notwithstanding the terms of the Original Lease, Tenant has
instructed that Landlord select and use, and Landlord shall select and use, as the
general contractor for performing tenant finish work in the Demised Premises, Humphries
and Company General Contractors (Humphries). Landlord, upon the direction and at the
request of Tenant, will not bid such work, as required under the Original Lease, to any
other contractor. Once Humphries has provided a final price for the tenant finish work
for the Demised Premises, Landlord shall provide such price to Tenant, for Tenants
approval.

3.
No Other Modifications. Except as expressly modified herein, the Original Lease shall
remain in full force and effect and, as modified herein, is expressly ratified and
confirmed by the parties hereto.

4.
Legal Representatives, Successors and Assigns. This First Amendment shall be binding upon
and shall inure to the benefit of Landlord and Tenant and their respective legal
representatives, successors and assigns.

5.
Georgia Law. This First Amendment shall be construed and interpreted under the laws
of the State of Georgia.

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6.
Time of Essence. Time is of the essence of this First Amendment.

7.
Consent of Guarantor. Tenant shall cause the guarantor of the Original Lease
to execute and deliver to Landlord the Acknowledgement and Consent of Guarantor, attached
hereto as Exhibit B, by this reference incorporated herein, with the execution and
delivery of this First Amendment. The delivery of this document is a material inducement
to Landlord, without which Landlord would not have executed and delivered this First
Amendment.

IN
WITNESS WHEREOF, the parties have hereunto set their hands and seals as of the day, month
and year first above written.

| | LANDLORD:                                                                    
| | -------------------------------------------------------------------------------
| |                                                                                
| | 3280 PEACHTREE I LLC,                                                          
| | a Georgia limited liability company                                            
| |                                                                                
| | By:                                                                            
| |                                                                                
| | By:                                                                            
| | Its:                                                                           
| |                                                                                
| |                                                                                
| | TENANT:                                                                      
| |                                                                                
| | AMERICAN TELECONFERENCING SERVICES, LTD., 
      D/B/A PREMIERE GLOBAL SERVICES
| |                                                                                
| | By:                                                                            
| | Name:                                                                          
| | Title:                                                                         
| |                                                                                
| | Attest:                                                                        
| | Name:                                                                          
| | Title:                                                                         

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