Vonage sued for third time over patents

Embattled VoIP firm, Vonage, has been hit by another patent infringement suit, this time from patent-holding company Klausner Technologies which is looking for $180m in damages and royalties.

Klausner alleges that Vonage infringes patents used in its voice mail service. The patent dates from 1994 and allows checking of analogue voice mail from a remote location.

Vonage, still suffering from a disastrous IPO, is already the subject of two other lawsuits for allegedly infringing patents. Last year a subsidiary of Sprint-Nextel filed against Vonage and then in June, Verizon launched its own suit claiming Vonage had infringed on seven of its patents.

Perhaps picking up a few tips in the litigation game itself, Vonage yesterday acquired three VoIP patents from Digital Packet Licensing.

The patent dates from 1994 and allows checking of analogue voice mail from a remote location.