An secure android/iOS IAX dialer (NOT SIP !!!) e.g. RedPhone (which by the way is Open Source and can be used as a base) with provision for changing and saving the individual server settings for each server that it connects to. The number that it dials should have the dialer installed to receive the call or else the caller will be notified of call failure. The encryption details that needs to be implemented will be provided later. The dialer must also have a voice flanger, to imitate women, robot and other voice types which are to be discussed later.
Skills: iphone-sdk, iphone-development, android-sdk, android-development, voip