Mobile app to connect with proprietary web based chat

Hello freelancers! I have a working chat application to be used as customer support in websites. Using XMPP and want to create a mobile app that will connect the operators to the visitors. When there is a chat request the mobile device will receive an audio/visual alert. Also need to add real time audio capability if the operator checks as available for audio call and is not busy in another audio call the website visitor will see an icon to invite him to call. The app must start as a service when device is started. Os: Iphone/Android/windows mobiles/Blackberry/pc/mac/webrtc Please check the attachment to find out more. You will have to p[rove that you are experienced in mobile and savvy about the project. Provide some example of previous projetc similar you have done. Good luck! Eddyki