Sprint Nextel Files Patent Infringement Lawsuit against Vonage. Oops…. now Vonage IPO has some problems. Sprint says it has patents, “that protect a series of innovations that enable the processing and delivery of packetized voice and data communications, including Voice over Internet Protocol (“VoIP”) communications. … willfully infringed seven patents relating to voice over packet technology developed by Sprint Nextel.” Vonage is not the only one. VoiceGlo and theGlobe.com are also being sued.