27 September 2007 10:41 GMT / By Amy-Mae Elliott
Vonage Holdings has been ordered to pay $69.5 million in damages, as well as 5% of future revenues, for infringing on patents owned by Sprint Nextel.
This ruling follows a similar case earlier this year that saw Vonage guilty of infringing on three Verizon patents which saw $58 million in damages.
Sprint's claim was relating to patents for connecting internet phone calls, whereas the previous Verizon case was regarding internet phone systems.
Vonage's shares dropped dramatically as a result of the verdict, which although the company plan to appeal, has been described as the VoIP company's "death knell".
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