<DOCUMENT>
<TYPE>EX-99.77B ACCT LTTR
<SEQUENCE>2
<FILENAME>ex77b.txt
<DESCRIPTION>REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
<TEXT>

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,
2007, in accordance with the standards of the Public Company Accounting
Oversight Board (United States), we considered its 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 Fund'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. Such internal control includes policies and procedures
that provide reasonable assurance regarding prevention or timely detection of
unauthorized acquisition, use, or disposition of a Fund'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 control deficiency 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 significant
deficiency is a control deficiency, or combination of control deficiencies, that
adversely affects the Fund's ability to initiate, authorize, record, process, or
report external financial data reliably in accordance with generally accepted
accounting principles such that there is more than a remote likelihood that a
misstatement of the Fund's annual or interim financial statements that is more
than inconsequential will not be prevented or detected. A material weakness is a
significant deficiency, or combination of significant deficiencies, that results
in more than a remote likelihood that a material misstatement of the annual or
interim financial statements will not be prevented or detected.

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
significant deficiencies or 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, 2007.

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

Chicago, Illinois
December 14, 2007

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