Michael Rollins, analyst with Citigroup--the bank that led Vonage's ill-fated IPO last year--wrote in a March 26 note that "failing to successfully address the patent infringement suits" could force Vonage into "a financial restructuring or bankruptcy" in one or two years.

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The country has no patent regime currently, although patent protection is due to come into force in the next five years.

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The patent life began running at the filing date in October 2001 and remains in force for 20 years.

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