Develop an iPhone application (SIP/XMPP)

Final desired outcome is an iOS application which can make SIP calls and can send XMPP messages (P2P + Group chat + File/Media Sharing) Server side is based on Asterisk and OPEN Fire (eJabberd) Free source integrations at Client side is also acceptable after technical negotiations. Integration with web services to get and set user information on the device Activation system using SMS (the server side is ready and working) Integration with Asterisk and Open Fire (servers are configured and working fine) General SIP features like STUN, nat support, transfer ... are required. Main protocols are SIP and XMPP. Detailed requirement will be added in future. Demo and pre developed applications are accepted. Bid only if you have experience and provide your experience in the proposal.