Hi Jurijs,

I assume:
UA => OpenSIPS => Freeswitch => VoIP provider

172.31.0.169:5060 - OpenSIPS
172.31.22.124:5060 - Freeswitch
178.*.*.12:5060 - VoIP provider

Yes, it is correct.

As you can see BYE is strange too... Bye should be sent back to OpenSIPS, but not to 52.*.*.177:5060.

It is external sip IP. 172.31.0.16 - it is IP in amazon local network; 52.*.*.177==sip0.MY_SIP_DOMAIN.com - it is public IP and domain of opensips.

Trouble was in opensips ports configures. On clients available only 5061 (tls) port and disablied 5060 port. In opensips server enabled 5060 and 5061 ports and opensips send request to freeswitch by 5060 port.

Aftrer opensips send 200 OK command and ACK to client by 5060 port, but on clients available only 5061 port and packets dont delivered.

Thanks for help, a programmer who does not have experience in servers administration and VOIP-telephony is not easy to quickly deal with the fact that there is. But with your help, I managed to make it work.