Calamos Investment Trust Amendment to Internet Access Agreement

Exhibit h23

Calamos Investment Trust

Amendment to Internet Access Agreement

     This is an amendment (the “Amendment”) to the Internet Access Agreement, dated September 11, 2000, by and between Calamos Investment Trust and U.S. Bancorp Fund Services, LLC, (as amended, restated, modified or supplemented from time to time, collectively, the “Agreement”).

     In consideration of the mutual covenants and agreements contained herein, the parties agree to the following amendments to the Agreement:

(1) The separate series of Calamos Investment Trust set forth on each of Exhibit A and Exhibit B of the Agreement are hereby replaced with the following:

Name of Series

Calamos Growth Fund

Calamos Blue Chip Fund

Calamos Value Fund

Calamos Growth and Income Fund

Calamos International Growth Fund

Calamos Global Growth and Income Fund

Calamos High Yield Fund

Calamos Convertible Fund

Calamos Market Neutral Income Fund

Calamos Multi-Fund Blend

Calamos Global Equity Fund

Calamos Total Return Bond Fund

Calamos Evolving World Growth Fund

     All other terms of the Agreement shall remain in full force and effect. If the terms of the Agreement and this Amendment conflict, the terms of this Amendment shall govern.

     Each party represents that the undersigned has full power and authority to execute this Amendment and bind such party according to the terms herein.

Dated: September 16, 2009

Calamos Investment Trust						U.S. Bancorp Fund Services, LLC
By:		/s/ Xxxxxx Xxxxx				By:		/s/ Xxxxxxx X. XxXxx
Name:		Xxxxxx Xxxxx				Name:		Xxxxxxx X. XxXxx
Title:		Secretary				Title:		Executive Vice President