Loudtalks brings Push-To-Talk to Android, Blackberry or Windows Mobile Phone and PC

Loudtalks (beta) is a free cross-platform push-to-talk (PTT) app for Android that turns your device into a walkie-talkie and allows you to talk with others in private or over public channels. Multi-platform support, real-time streaming with high quality voice, contacts availability and text status, multiple public channels for up to 100 users and in-app facility to map a hardware push-to-talk