Sip Client for Mobile

We are looking for company to develop for us Mobile SIP Client for 1) iPhone 2) Symbian 3) Android Supported services should be: 1) Voice 2) SMS 3) Video Calls 4) IPTV - list of predefined internet TV channels Featuring • Connection over Wifi / 3G • Language support - customizable • Native Contact Phonebook • Dial, Hang up, Redial • Call Hold • Call Mute • Call Forwarding • Call Waiting • Speaker Phone • Keypad Display • Call History: All, Recent, Dialed, Missed • DTMF: Inband / Outband / SIP INFO • Account Setup • Brandable Client (changing some images) like themes • Codec Support G729, AMR Example of Mobile SIP Clients === iPICO or FICALL or isipsimple sip clients from APP Store