[sr-dev] fr_timer

[Martin Hoffmann]

Andrei Pelinescu-Onciul wrote:
> On Oct 05, 2009 at 17:12, Martin Hoffmann <martin.hoffmann at telio.ch> wrote:
>
> >    Similarly, fr_timer indicates the time after which resending of a
> >    2xx response upstream will cease, if no ACK has been received.
>      ^^^^ negative response to an invite
> 
>      (it has nothing to do with 2xx/ACK which are end-to-end, but with
>       negative replies replies for INV and ACK)

Er, yes. Of course.

> > But if it gets split, rather use nr_inv_timer and fr_inv_timer or
> > somesuch, to make it a bit more telling. Or use, what is it? A and C?
> 
> There is not a 1:1 mapping between the RFC timers and the tm timers.
> According to the RFC we should use only fr_inv_timer all the time for
> INVITEs :-) (so no fast failover, voicemail a.s.o)

After reading: Isn't fr_timer corresponding to timer B and fr_inv_timer
to C? Which actually would mean that you shouldn't mess with fr_timer
and keep it at 32 seconds and are free to mess with fr_inv_timer but
make it reasonably big?

> See also https://sip-router.org/wiki/ref_manual/timers , which is a more
> complete description, including corresponding RFC timer names.

See? ;)

Regards,
Martin
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