Hello Mykyta,

The problem is that the Record-Route header being inserted in your 200 OK [1] is the private IP address of the Kamailio proxy, and this address is not the address that is used by the outside endpoint to reach the proxy. So, end-to-end ACKs and other in-dialog requests sent through it will not reach the proxy and will not be forwarded to the callee.

It seems to me that your server has a 1:1 NAT'd public IP. The idiomatic solution to this problem from a Kamailio perspective is to take advantage of the 'advertise' parameter to the 'listen' directive:

https://www.kamailio.org/wiki/cookbooks/5.0.x/core#listen

If you set it to your public IP, e.g.

listen=udp:10.17.0.9:5060 advertise x.x.x.x.x:5060

I think things will work better for you. :-)

-- Alex

[1] See line 45 here: https://pastebin.com/wyT3cBbD

On Fri, Sep 01, 2017 at 05:35:08PM +0300, Микита Нікітенко wrote:

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

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