In your logs I found this: ERROR AudioRecord is not initialized properly. It may be caused by RECORD_AUDIO permission not granted
If you didn't granted the audio record permission it would explain why you don't send audio out.
About the phone - Android 8 on Nexus-6p
About Linphone - 3.3.1, core 3.12.0-273-g20efb4ad4
I collected the debug log and there was nothing that jumped out at me other than the call statistics. Of course the party on the phone cannot be heard. Rtpc is OK. Full debug is attached. I tried re-installing Linphone. It didn't help.
Rob
The statistics say it all
2017-12-03 14:30:40:115 [ortp] MESSAGE ===========================================================
2017-12-03 14:30:40:115 [ortp] MESSAGE AUDIO SESSION'S RTP STATISTICS
2017-12-03 14:30:40:115 [ortp] MESSAGE -----------------------------------------------------------
2017-12-03 14:30:40:115 [ortp] MESSAGE sent 0 packets
2017-12-03 14:30:40:115 [ortp] MESSAGE 0 duplicated packets
2017-12-03 14:30:40:115 [ortp] MESSAGE 0 bytes
2017-12-03 14:30:40:116 [ortp] MESSAGE received 469 packets
2017-12-03 14:30:40:116 [ortp] MESSAGE 0 duplicated packets
2017-12-03 14:30:40:116 [ortp] MESSAGE 80668 bytes
2017-12-03 14:30:40:116 [ortp] MESSAGE incoming delivered to the app 79636 bytes
2017-12-03 14:30:40:116 [ortp] MESSAGE incoming cumulative lost 0 packets
2017-12-03 14:30:40:116 [ortp] MESSAGE incoming received too late 1 packets
2017-12-03 14:30:40:116 [ortp] MESSAGE incoming bad formatted 0 packets
2017-12-03 14:30:40:116 [ortp] MESSAGE incoming discarded (queue overflow) 0 packets
2017-12-03 14:30:40:116 [ortp] MESSAGE sent rtcp 1 packets
2017-12-03 14:30:40:116 [ortp] MESSAGE received rtcp 1 packets
2017-12-03 14:30:40:116 [ortp] MESSAGE ===========================================================
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