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The Calamos Convertible and High Income Fund operates as a closed-end investment vehicle concentrating on fixed income, originally sponsored by Calamos Investments LLC and presently managed by Calamos Advisors LLC. Its investment mandate is solely focused on the debt markets within the United States. The fund's primary strategy involves cultivating a diverse collection of convertible instruments and corporate bonds offering high yields. These target investments typically carry credit ratings of Ba or lower from Moody's, or BB or lower from Standard & Poor's. To construct its portfolio, the fund integrates both rigorous fundamental analysis and systematic quantitative modeling. This entity commenced operations on March 12, 2003, and is legally domiciled in the U.S.