问题
After wasting lots of time on internet i'm expecting problem will be solve from here.
I'm using org.pjsip.pjsua2 to make a call. It works fine for API <=18 but for API > 18 i'm unable to place a call. What may be the problem.
来源：https://stackoverflow.com/questions/36738485/make-call-above-api-18-using-pjsip