Iphone VOIP/ Sip App

Project requirement regarding Softphone for mobile. Its a complete technical project which required in depth knowledge in VOIP fields. We require a soft-phone for iPhone and android. Few of the details are as below Platform: iPhone (later in year Android option) Audio codecs: g729 , ulaw , alwav , speex , gsm Should be able to support STUN. Connection over Wifi / 3G / Local Access • Native Contact Phonebook • Dial, Hang up, Redial automatically • Call Hold • Call Mute • Balance display • Speaker Phone • Keypad Display • Call History: All, Recent, Dialed, Missed • Account Setup • Our Branded Client Design & logo • Codec Support G729 • Work with all standard SIP servers • Incoming call alert with ringing • Gsm Call Alert when on VoIP call • Gsm call answer when on VoIP call • Brand name • Copy right Server settings to be inbuilt so on download and install client just enters username and password. also account balance display (we provide the link) The delivery of the project should include source code. The project will have support for bugs fixing. Includes a decent GUI development. Let me know about the past experience in the same field, price and time estimation about the project. Let me know about anything more u need.