Write some software -- 2

I need you to develop some software for me. I would like this software to be developed for Linux . looking to have a custom Push to talk application for Android, Windows and Linux. The application to be built needs to be a complete solutions including but not limited to a server (linux), Android mobile application, Windows desktop and Mac. The solutions would need to have/be: -Linux Server Asterisk running -PTT communication between desktop, mobile apps and two-way radios (Walkie-Talkie) -Secure communications -Scalability for 1000+ user, iOS(future) -GUI design -SDK for third party vendors -Linux/Windows desktop client must allow for VOX operations as an option for use with USB VOX Gateway -Linux/Windows desktop client should allow for PTT key mapping -Linux/Windows client should be able to see user presence and groups with Google maps location -Admin backend to allow for creating users and groups -Android client allows for viewing user presence -Android client allows for key mapping for PTT key assignment -Android client allows VOX operations -Android client allows for PTT operation via bluetooth serial commands (PTT=P(PTT) | PTT=R(release) I appreciate your help and looking forward to hearing from all the talents!