499781 Website SIP Client

I am seeking a programmer who is able to write a website-based SIP client to handle inbound calls. It will preferably have user-selectable mic/speaker (but default recording and playback devices are an option here), support auto-answer (configurable to be user selectable or forced), and sending of DTMF tones. I will need to be able to read the status of this from a the webpage (ie. connected:123456; status:waiting;) by polling it in the background with javascript preferably. Support for G.711 and G.723.1 should be configurable. It must run on Windows XP/Vista/7 and OSX/Linux would be an added bonus. Java and flash are available to work with. Seems to me java has a SIP API so it might be the best route. I'm not opposed to exploring the use of Adobe Flash but I don't believe it supports it natively and might be too complicated to get setup. Please leave a comment indicating what you're thinking this should be built in. Preference will be given to those who can demonstrate they have a solid understanding of my needs and are able to complete this project without issue. I don't expect you to support the software once it is built but if you're available for future consulting please advise. Full source code (where available) will be required upon successful completion of this project (sloppy coders beware.)