Apple faces yet another lawsuit once again as Klausner Technologies accused the company for infringing its U.S. Patents 5,572,576 and 5,283,818, which were allegedly used in the visual voicemail feature of Apple's popular iPhone.

The iPhone's visual voicemail feature enables users to pick and choose which voicemail message they want to retrieve using the iPhone's inbox display. This functionality supposedly violates the intellectual property rights of Judah Klausner, inventor of the PDA and electronic organizer.

According to the lawsuit filed by Klausner Technologies in the Eastern District of Texas, the above patents were already licensed to other companies such as Vonage and AOL Time Warner.