hey, i have a project to do on mobile development n i came up wit the idea of having a helpline that is 24/7 for any type of emergencies. however i did not want it to be the typical "dial 999" application. i wanted it to work in ways if u cannot access ohone directly but still be able to call 999. i came up wit the decibel meter idea. for the scream to trigger off the call. however i wanted other tecchnologies since the decibel meter have some limitations. any ideas will be highly appreciated. thanks alot!!