Develop a Demo app similar to voxer (voxer,com). It is a Walkie-Talkie (push-to-talk) app for smartphones.
Voxer lets you to send instant audio, text and photo messages to friends (one or more!) within a buddy list. The messages are streamed live as you talk and your friends join you live or listen later. Mobile app can be used over GPRS, EDGE, 3G, 4G or WIFI networks -- whatever is available at the time.
The Demo project shall cover smartphone's Android client, servers/backend solutions, and interfaces to 3rd party systems for demo propose.
The attached file shows project description and other details.