[SR-Users] Callback for TM´s "fr_inv_timer" ?

[Antonio Couto]

There some way to set a callback route for TM´s "fr_inv_timer" ?
I want to receive this callback when its fires and before Kamailio send 408
Request Timeout to the caller ?

I tryed every callback available but I think I missing something or I will
need to implement  on TM module.

Thanks in advance
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