When Sprint Nextel filed its lawsuit last month against theglobe.com, Voiceglo and Vonage Holdings for allegedly infringing on its proprietary technology, it may have catapulted all voice over IP (VoIP) service providers into the complicated world of patent litigation. Whether the two defendants eventually have their day in court or settle matters privately still remains to be seen. As of this article's publication date, no response has yet been filed by either defendant. But legal experts familiar with the case generally agree that Sprint is executing on a well-constructed legal strategy that the puts the defendants before an uphill climb....