makecall() with pjsua2 do not create an invite

[aduiliosilva@xxxxxxxxxxxxxxxx (Aduílio)]

I'm using pjsua2 with Android build. My app and the pjsua2 sample is not 
making outgoing calls. The makecall() method is not creating an INVITE 
to the server. REGISTER and INCOMING CALLS are working normally.

MyCall call = new MyCall(account, -1);
CallOpParam prm = new CallOpParam(true);
CallSetting opt = prm.getOpt();
opt.setAudioCount(1);
opt.setVideoCount(0);

try {
     call.makeCall("sip:user at domain:port", prm);
} catch (Exception e) {
     e.printStackTrace();
     call.delete();
     return;
}


Aduilio