Documentation
https://www.kamailio.org/docs/modules/devel/modules/tm.html#tm.p.fr_timer says:
>Timer which hits if no **final reply** for a request or ACK for a negative
>INVITE reply arrives (in milliseconds).
Looks like it is not correct description - fr_timer value works until 1xx(not
**final**) response received and then timer restarted with fr_inv_timer value
there:
https://github.com/kamailio/kamailio/blob/master/src/modules/tm/t_reply.c#L2760
Looks like old doc from sip router
https://sip-router.org/wiki/ref_manual/timers explains it correctly:
> fr_timer
This timer is used for all SIP requests. It hits if no reply for an INVITE
request or other request has been received (F in milliseconds). If a
provisional reply is received for an INVITE (any 1xx), then the fr_inv_timer
will be used instead. And if no replies (at all) for an INVITE are received
before `fr_timer` hits, the transaction is terminated with a 408 in failure
route.
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