Android (and Iphone) VOIP/sip/xmpp specialist

We are looking for a talented android(and possibly iphone) developer that is experienced in VOIP. Skills required: - sip (for audio and video calls) - xmpp (for presence and messaging) We would like a person who has experience with using a sip stack library for making audio and video calls (H264 for video, ilbc, opus or similar for audio) and using an xmpp library for mobile phones (mainly android but iphone is also a big plus). Also that person should know how to use NAT traversal technologies like ICE protocol, STUN and TURN servers. Also big plus is knowledge of adaptive bit rate and other means of changing video and sound quality based on the quality of internet connection. Before answering for the ad write "I CAN DO THIS" as the first line so we can weed out automatic applying for the job.