help for voice over ip

hello,every one ,I am a postgraduate ,and I'm working on an embeded project with a wince platform,our project is to develop an application which can let each wince ending speak to each other on the internet, I have worked out the recording and playing part in evc , I planned to send the voice over ip by socket ,but refused by my teacher because of QoS, and I don't know how to do now, I search the wince plateform finding it supports tapi,I wonder whether I can do it with tapi,if yes ,can anyone give me an example of tapi programming.because I know nothing about it ,and I don't know how to get started with it ,I would appreciate your help.if you send me an example of tapi example in vc++! and my email is [email protected]