Apple and AT&T were sued on Monday over patents that cover the voice mail feature on the iPhone.

Klausner Technologies Inc. filed a patent lawsuit against Apple and AT&T alleging that Apple's iPhone Visualmail feature infringes two patents worth $360 million in damages and future royalties.

New York based Klausner on Monday said it believed iPhone violates Klausner's intellectual property rights by allowing users to selectively retrieve voice messages via the iPhone's ibox display.

Klausner Technologies alleges that its the sole owner of patents in the United States and abroad that covers various visual voice mail services and products.

Klausner unveiled that the patents in question were only licenced to other compainies that provide visual voice mail, including Time Warner's AOL for use in its AOL voice mail service and vonage.

Skype and Cablevision Systems were also targetted in a lawsuit worth about $300 million.