I require to develop VOIP (voice over internet application) on preferably android platform, but windows OS is acceptable. Project is not meant to be done from scratch and I expect freelancer to be adept at utilizing already available open source projects to drastically cut development costs and time only modifying already existing solutions to my needs. Original VOIP application can be taken from any open source programs available. After that, if there isn't an available version according to my needs, I expect for freelancer to apply some form of security to encrypt outgoing packages. I expect that freelancer will be available to use already existing solutions of this or any other similar security solution to present me with working program.
After initial task, I will of course expect that workings/code of said program would be commented as per usual and ensuring that I will be able to use said software without a problem. There are possible extension goals in using said software to illustrate and to analyze its workings.
Priority shall be given to freelancers who can best utilize and modify already existing projects as much as possible and to cut development costs in doing so. Project is for my personal use and I expect freelancer to merely implement already existing solutions.