Simple Sip App on Andoird, Blackberry Ms app

Hi I need a very simple SIP Android/Iphone/Ipad/Blackberry app, that connects to our IVR and plays a telephone service. In a nutt shell it i will connect to a Sercure Ip (hard coded) The app will have 2 or three screens including the start-up. We want to allow the user to register the device. We have the impages. We want a referal element (facebook, twitter, email, sms) The further details, sample and the screen format art work will be provided to selected bidders. Thank you