<DOCUMENT>
<TYPE>EX-99.77B ACCT LTTR
<SEQUENCE>2
<FILENAME>ex77b.txt
<DESCRIPTION>EXHIBIT
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                                                                  EXHIBIT 77(b)


(DELOITTE (R) LOGO)                                       Deloitte & Touche LLP
                                                          111 S. Wacker Drive
                                                          Chicago, IL 60606-4301
                                                          USA

                                                          Tel: +1 312 486 1000
                                                          Fax: +1 312 486 1486
                                                          www.deloitte.com

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and Board of Trustees of Calamos Global Total Return Fund

In planning and performing our audit of the financial statements of Calamos
Global Total Return Fund (the "Fund") as of and for the year ended October 31,
2008, in accordance with the standards of the Public Company Accounting
Oversight Board (United States), we considered the Fund's internal control over
financial reporting, including control activities for safeguarding securities,
as a basis for designing our auditing procedures for the purpose of expressing
our opinion on the financial statements and to comply with the requirements of
Form N-SAR, but not for the purpose of expressing an opinion on the
effectiveness of the Fund's internal control over financial reporting.
Accordingly, we express no such opinion.

The management of the Fund is responsible for establishing and maintaining
effective internal control over financial reporting. In fulfilling this
responsibility, estimates and judgments by management are required to assess the
expected benefits and related costs of controls. A Company's internal control
over financial reporting is a process designed to provide reasonable assurance
regarding the reliability of financial reporting and the preparation of
financial statements for external purposes in accordance with generally accepted
accounting principles. A company's internal control over financial reporting
includes those policies and procedures that (1) pertain to the maintenance of
records that, in reasonable detail, accurately and fairly reflect the
transactions and dispositions of the assets of the company; (2) provide
reasonable assurance that transactions are recorded as necessary to permit
preparation of financial statements in accordance with generally accepted
accounting principles, and that receipts and expenditures of the company are
being made only in accordance with authorizations of management and directors of
the company; and (3) provide reasonable assurance regarding prevention or timely
detection of unauthorized acquisition, use, or disposition of a company's assets
that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting
may not prevent or detect misstatements. Also, projections of any evaluation of
effectiveness to future periods are subject to the risk that controls may become
inadequate because of changes in conditions or that the degree of compliance
with the policies or procedures may deteriorate.

A deficiency in internal control over financial reporting exists when the design
or operation of a control does not allow management or employees, in the normal
course of performing their assigned functions, to prevent or detect
misstatements on a timely basis. A material weakness is a deficiency, or a
combination of deficiencies, in internal control over financial reporting, such
that there is a reasonable possibility that a material misstatement of the
company's annual or interim financial statements will not be prevented or
detected on a timely basis.


                                        Member of
                                        Deloitte Touche Tohmatsu

<PAGE>

Our consideration of the Fund's internal control over financial reporting was
for the limited purpose described in the first paragraph and would not
necessarily disclose all deficiencies in internal control that might be material
weaknesses under standards established by the Public Company Accounting
Oversight Board (United States). However, we noted no deficiencies in the Fund's
internal control over financial reporting and its operation, including controls
for safeguarding securities, that we consider to be a material weakness, as
defined above, as of October 31, 2008.

This report is intended solely for the information and use of management and the
Board of Trustees of Calamos Global Total Return Fund and the Securities and
Exchange Commission and is not intended to be and should not be used by anyone
other than these specified parties.


(DELOITTE & TOUCHE LLP)

December 18, 2008
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