Freeswitch is getting registration request from ip:random_port and freeswitch responding to ip:5060 and that is why
As shown in image 91.18.19.90:50319 is sending register request to freeswitch server 38.201.12.30 but freeswitch is responding to 91.18.19.90:5060 and device is not able to register, what is wrong here?