mobile phone application

We are looking for someone who has already developed a mobile sip application who can create and design an application for our phone company. Branded SIP client with company logo - based on g729 / GSM / ulaw codecs - based on asterisk - requires linking to existing contact list - requires voicemail tab via asterisk ARI - able to play, download, delete - view call history (local to sip client) - button for SIP call or regular - sip domain selectable from drop down list - option to call forward extension to mobile number via asterisk ARI - find me follow me options via ARI - future updage for ejabbered xmpp instant messanger - option to stay open in background / service for iphone, blackberry, android our company is called phonewave