在SmartPhone上使用RIL Audio进行音频反馈

We're working on a SIP softphone and we get audio feedback when we call from one phone to the other. However, when we call from a normal SIP Phone (software or hardware) to our app, then it all works fine - it's only when calling from one phone using the app to another one. Here is the code we use to initialize RIL Audio:We're working on a SIP softphone and we get aud