Re: [EXT] Possible bug introduced in 5.8.5

Andreas,

I can confirm, that with header with brackets. when using
uac_replace_from("", <URI>), like to clean username
Kamailio is adding extra space between From; and <URI>
which is already fishy for me.
I would suspect, that there is a problem with "empty string" and at some
point it's transformed to " " (1-space string)

I guess (again), there is somehing fishy with handling brackets already,
but it revealed with the commit mentionned.

To reproduce, I've added 2nd SIPP file with brackets to a repo.
https://github.com/igorolhovskiy/kamailio-dev-dc/tree/kamailio_bug_5.8.5

Le jeu. 5 févr. 2026 à 10:37, Andreas Heil via sr-users <
[email protected]> a écrit :

> I tested that:
> I put a „xlog“ before every use of uac_replace_to and every
> uac_replace_from.
> Both got called only once per call.
>
> I rechecked and summarized the problem:
> 5.6.6
>     INVITE w/ brackets + uac_replace_to
>         kamailio inserts a space between "To:" and "<sip..." (e.g.
> "To:[SPACE][SPACE]<sip...")
>         no problem here
>     INVITE w/o brackets + uac_replace_to
>         kamailio inserts a space between "To:" and "<sip..."
>         no problem here
>     INVITE w/ brackets + remove_hf/append_hf
>         kamailio inserts a space between "To:" and "<sip..."
>         no problem here
>     INVITE w/o brackets + remove_hf/append_hf
>         kamailio inserts a space before "From:" (e.g.
> "[SPACE]From:[SPACE][SPACE]<sip...")
>         The "To:" header looks good
> 5.8.4
>     INVITE w/ brackets + uac_replace_to
>         kamailio inserts a space between "To:" and "<sip..." (e.g.
> "To:[SPACE][SPACE]<sip...")
>         no problem here
>     INVITE w/o brackets + uac_replace_to
>         kamailio inserts a space between "To:" and "<sip..."
>         no problem here
>     INVITE w/ brackets + remove_hf/append_hf
>         kamailio inserts a space between "To:" and "<sip..."
>         no problem here
>     INVITE w/o brackets + remove_hf/append_hf
>         kamailio inserts a space before "From:" (e.g.
> "[SPACE]From:[SPACE][SPACE]<sip...")
>         The "To:" header looks good
> 5.8.5
>     INVITE w/ brackets + uac_replace_to
>         kamailio inserts a space between "To:" and "<sip..." (e.g.
> "To:[SPACE][SPACE]<sip...")
>         no problem here
>     INVITE w/o brackets + uac_replace_to
>         kamailio inserts a space between "To:" and "<sip..."
>         it also appends the new value after the old (e.g.
> "To:[SPACE][SPACE]<OLDVALUE>NEWVALUE"
>     INVITE w/ brackets + remove_hf/append_hf
>         kamailio inserts a space before "From:" (e.g.
> "[SPACE]From:[SPACE][SPACE]<sip...")
>         The "To:" header looks good
>     INVITE w/o brackets + remove_hf/append_hf
>         kamailio inserts a space and the old value of "To" before the
> "From" (e.g. "[SPACE]<sipOldToHeader>From:[SPACE][SPACE]<sip...>")
>         The "To:" header looks good
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-- 
Best regards,
Ihor (Igor)

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