[SR-Users] Dispatcher Usage and change of $rU

[Daniel-Constantin Mierla]

dispatcher module does not touch To/From headers, so if the $tU/$fU are
changed, there are other actions in kamailio.cfg doing it.

dispatcher updates r-uri ($ru) if ds_select_domain() is used, by
changing the domain part ($actually rd, port and parameters).

When ds_select_dst() is used, r-uri ($ru, $rd, ...) is not touched at
all, only dst-uri is set ($du).

Use ds_select_dst() when you do not want to lose the r-uri content
(e.g., preserve incoming r-uri domain), but you want to set a particular
next hop address.

Cheers,
Daniel

On 29.04.22 11:58, Benoît Panizzon wrote:
>> There’s a typo here:
> Ignore, I only made that type in the email example.
>
> After some more google research I found another user describing a
> similar issue so I did some testing:
>
> ds_select_dst does RESET $rU and $tU but not $fU
>
> ds_select_domain does not RESET $rU or $tU.
>
> Doing:
>
> ds_select_dst("2000","6");
> $rU = "0012345";
> route(RELAY)
>
> setting $rU after calling ds_select_dst solved the issue I have.
>
> But I wonder, why this is resetting certain header. This is not clear
> from the documentation.
>
> I also wonder: When should one use ds_select_dst and when
> ds_select_domain ?
>
> Could ds_select_domain be safely used for any situation?
>
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