restcomm hello world project from Restcomm Client Android SDK 1.0.0 BETA3 error

Question

I'm runnig the restcomm hello world project from Restcomm Client Android SDK 1.0.0 BETA3 I followed the steps mentioned in this answer Mobicents Restcomm Hello-World Implementation

But when I dial I still have errors in the logcat and I don't hear the Restcomm instance associated announcement. this the log content :

02-22 10:27:19.912 31783-3951/com.telestax.restcomm_helloworld E/libjingle: webrtc: stereo playout is not supported 02-22 10:27:19.912 31783-3951/com.telestax.restcomm_helloworld E/libjingle: webrtc: failed to enable stereo recording 02-22 10:27:19.912 31783-3951/com.telestax.restcomm_helloworld E/libjingle: webrtc: (voe_base_impl.cc:364): Init: Failed to set agc to enabled: 0 02-22 10:27:19.912 31783-3951/com.telestax.restcomm_helloworld E/libjingle: webrtc: (voe_audio_processing_impl.cc:1007): SetTypingDetectionStatus: not supported 02-22 10:27:19.912 31783-3951/com.telestax.restcomm_helloworld E/libjingle: webrtc: (voe_audio_processing_impl.cc:1007): SetTypingDetectionStatus: not supported 02-22 10:27:19.912 31783-3951/com.telestax.restcomm_helloworld E/libjingle: webrtc: failed to enable stereo recording 02-22 10:27:19.912 31783-3951/com.telestax.restcomm_helloworld E/libjingle: webrtc: stereo playout is not supported 02-22 10:27:23.356 31783-4012/com.telestax.restcomm_helloworld E/libjingle: webrtc: (process_thread_impl.cc:31): TimeUntilNextProcess returned an invalid value -4 02-22 10:27:23.586 31783-31783/com.telestax.restcomm_helloworld E/RCConnection: onSipUAError(): error code: SIGNALLING_CALL_ERRORerror text: sendto failed: EPERM (Operation not permitted) 02-22 10:27:23.646 31783-3952/com.telestax.restcomm_helloworld E/libjingle: SetAudioSend: No audio channel exists. 02-22 10:27:23.926 31783-4005/com.telestax.restcomm_helloworld E/BufferQueue: [unnamed-31783-5] cancelBuffer: slot 5 is not owned by the client (state=0) 02-22 10:27:23.926 31783-4005/com.telestax.restcomm_helloworld E/BufferQueue: [unnamed-31783-5] cancelBuffer: slot 6 is not owned by the client (state=0) 02-22 10:27:23.926 31783-4005/com.telestax.restcomm_helloworld E/BufferQueue: [unnamed-31783-5] cancelBuffer: slot 7 is not owned by the client (state=0)