Cosmosis S-4/A Registration of securities issued in business combination transactions (amended)

EXHIBIT 15.01

June 28, 2011

To the Board of Directors and Stockholders of

West Corporation and subsidiaries

Omaha, Nebraska

We have reviewed, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the unaudited interim financial information of West Corporation for the three-month periods ended March 31, 2011 and 2010, and have issued our report dated May 3, 2011. As indicated in such report, because we did not perform an audit, we expressed no opinion on that information.

We are aware that our report referred to above, which is included in your Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, is being used in this Registration Statement.

We also are aware that the aforementioned report, pursuant to Rule 436(c) under the Securities Act of 1933, is not considered a part of the Registration Statement prepared or certified by an accountant or a report prepared or certified by an accountant within the meaning of Sections 7 and 11 of that Act.

/S/ DELOITTE & TOUCHE LLP

Omaha, Nebraska