They apparently made several successful calls from their Basking Ridge, NJ. headquarters. The first call took place at 9:54 AM EST, between two Verizon executives using LG Revolution devices. They proceeded to make several more test calls, in addition to accessing data while placing those calls.
Verizon CTO Tony Melone said that "Today is another proof point that the LTE ecosystem is alive, healthy and thriving...VoLTE will quickly become the global standard for delivering voice over LTE networks."
Verizon's 4G LTE network has been in place in major markets since December, but only supports data. The VoLTE will take voice calls from the CDMA band up to the higher-fidelity LTE bandwidth when available. Unfortunately, Verizon doesn't anticipate offering VoLTE until late 2012.
For more information on Verizon's VoLTE calling, keep an eye on our coverage of the Mobile World Congress next week, where Verizon will be showcasing the technology.
source: Yahoo! News