You can use tcpops tcp_enable_keepalive (http://www.kamailio.org/docs/modules/devel/modules/tcpops.html#tcpops.f.tcp_keepalive_enable) to enable tcp keepalive per connection.

On Sat, 28 Nov 2020, 16:47 sergey-safarov, <notifications@github.com> wrote:

If the client does not send TCP keep-alive SIP message or TCP session timer on NAT router is too low then we have an issue.

As a workaround, I can use the operation system keepalive on the server-side.

net.ipv4.tcp_keepalive_time = 75

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