sip voice and video client

hi, i'm looking for a freelance programmer with experience in sip protocol based ip voice clients development including video too. This software has to be able to connect via ip voice(sip) pc to pc call, video and chat and call out to phones and mobiles for workers of the company that work at home with a pc. it doesn´t matter if the client is based in an open-source code like [login to view URL] if you really know that code and can modify it with my requeriments. I offer a salary ($200-$300) per month it is not a fixed salary can be modified depending on candidate, experience and time to deliver a real solution. You'll work like a freelance(Easily compatible with your job or your other freelance works) but with a monthly contract to deliver a required solution and take care about this new part of the company. If you're a freelance that could be interested it would be freat that i can see any project with similarities with this one. regards