[SR-Users] can't assign values to $fU

[Karthik Srinivasan]

Henning,

Thanks for the explanation.  This does clear it up for me.

Do you happen to know if there is a list of pseudo vars that fall under the
non special case?   (a list for those psedo vars where msg_apply_changes
needs to be called for the update to be reflected while in routing file
processing that is.)

Thanks,

Karthik

On Wed, Jun 13, 2018 at 1:39 PM, Henning Westerholt <hw at kamailio.org> wrote:

> Am Mittwoch, 13. Juni 2018, 20:28:13 CEST schrieb Alex Balashov:
> > On Wed, Jun 13, 2018 at 01:26:07PM -0500, Karthik Srinivasan wrote:
> > > Could you explain why we need to call this function when manipulating
> $fU
> > > ?
> >
> > Some PV manipulations work that way, others don't. :-) "Because
> > Kamailio".
>
> Don't want to dig into to much technical details here..
>
> But to give a bit more context, the Kamailio architecture related to SIP
> message processing is optimized to avoid re-parsing of the message during
> configuration processing. This works with so called "lumps" which are more
> or
> less like a programming patch file (e.g. change, delete parts). This lumps
> are
> applied shortly before sending the message out or if you call
> msg_apply_changes().
>
> Some parts of the SIP message are accessed directly, because they are
> "more
> important" (like the request URI) are handled specially, some like the
> From
> user are done like a normal SIP header part as described above.
>
> For a bit more details and to look into the details, have a look to the
> dbg_sip_msg([log_level], [facility]) function in the debugger module.
>
> Best regards,
>
> Henning
>
>
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