Hello! I have server at digital ocean with a floating ip address and I have routed sip traffic to this floating ip. At this server installed kamailio which balancing between freeswitch servers. I have a problem that call drops after 32 seconds with error ACK Timeout.

kamailio.cfg - https://pastebin.com/x0CL3TEZ

kamailio sip messages log - https://pastebin.com/wyT3cBbD

freeswitch logs with sip debug - https://pastebin.com/zPysfQkV

I'm struggling for a week and have no idea how to fix it.

Thank you very much.

Mykyta Nikitenko