Re: [EXT] Possible bug introduced in 5.8.5

Hello Igor,

Thank you. Ok, we see the double whitespace in the From with your scenario.

We were not able to see the old-value/new-value problem with the uac_replace_to without braces. Could you maybe add an example to your cfg that shows it?

Thanks,

Henning


From: Ihor Olkhovskyi via sr-users <[email protected]>
Sent: Donnerstag, 5. Februar 2026 11:04
To: Kamailio (SER) - Users Mailing List <[email protected]>
Cc: Ihor Olkhovskyi <[email protected]>
Subject: [SR-Users] 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]<mailto:[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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