For those interested, we've created a Precisely Parrots voice channel on the Zello network. The free Zello application can be installed on any PC, as well as on Android phones, iPhones, and Blackberry devices. Zello is push-to-talk style communications that works anywhere in the world where an Internet connection or cellphone signal exists.
You may download the latest version of Zello here: http://www.zello.com/