Modify JAVA file in App

I need to modify my sms app to send 2 phone calls with the 2nd call leaving a voicemail.. The code is java within the app that needs to be modified, i will send you the java file on request. Code needs to be modified to perform the functions below instead of sms.. starts by placing 2 calls at the same time (one using native dialer other using a SIP account) call one times out after 1 sec (SIP account call) call two placed at same time goes to voicemail (native dialer) call two leaves a prerecorded voicemail at voicemail tone then hangs up I also need to modify app to pull numbers and message locally instead of a webserver like it currently is(you will see once you read code).. If you understand what needs to be done, i will send you the file that needs modification so you can see what needs to be changed.. I need this completed in 3-4 days max, so faster you can complete the more chance i will accept your bid