Vonage Holdings Corp. (NYSE: VG) continues to pay big bucks to settle patent infringement cases.

The Internet phone company today settled its long-running dispute with Verizon Communications Inc. (NYSE: VZ). In March, a jury awarded Verzion $58 million and issued an injunction that basically would have forced Vonage out of business. That decision was upheld by the U.S. Court of Appeals for the Federal Circuit.

Vonage will pay Verizon up to $117.5 million, depending on the outcome of pending appeals, the Holmdel, NJ-based company said in a statement. It will also give $2.5 million to charity. This settlement isn't surprising. Patent litigation is really expensive and takes forever to wind its way through the courts which is why companies are eager to settle these cases before trial.

Earlier this month, Vonage settled a patent dispute with Sprint Nextel Corp. (NYSE: S) for $80 million. It faces a separate legal action from AT&T Inc. (NYSE: T). With all of these huge companies wanting a piece of it, it's a wonder that Vonage is still standing.

Absent the patent issues, Vonage's future remains bleak. It competes to offer what is basically a commodity service against much larger rivals. Once these patent cases are settled, my suspicion is that one of them will try to snap up Vonage while the stock continues to trade well-under its $17 IPO price. It closed today at $1.53.