Hi man.
Iam very appropriate with your requirement. I have more 2 years to developed Android (VoiIP, XML, JSON, Service in Android, ... ) and 3 years about Java. Im sure that i will bring to you the comfortable. You will smile and happy. And We work over your expect. Trust me.
Do you want to create app client on Android to test throw SIP? Let me disscuss more about it.
My skype: NguyenLeDaiThanh.
Plz Contact with me anytime you want!