Basic group voice chat app.
Note: only looking for functionality, UI can be text based and simple / wireframe.
1. Allow users to be added to group through USER_ID or email.
2. User may add themselves to group via Group_ID
3. User may see listing of groups they are a member of
4. Group members in ACTIVE group can hear each other via voice over Data connection
5. Bluetooth API for simple volume up/down, command to leave group (note: this may BT device specific so just code frame will be okay for custom command like this)
This is a VERY Basic stripped down functionality of example app like MUMBLE.