Could somebody help with one issue?

In some cases Kamailio can send messages itself.
For example, when fr_inv_timer is expired Kamailio sends 408 to the INVITE sender and CANCEL to the INVITE receiver.
These two messages (408 and CANCEL) are not printed into the log and I cannot find a way to do that.
There are also other scenarios when some Kamailio modules send SIP messages by its own.

So is there way to print out into log all such messages?
My goal is to get full message flow in the log per certain call-id.

Thank you in advance.
Best regards.
Konstantin