I don't know about the lump, but maybe try remove_hf_value instead.
This should also work if/when multiple Via values are comma-separated
in a single header field.
https://www.kamailio.org/docs/modules/devel/modules/textopsx.html#textopsx.f.remove_hf_value

James

On Wed, 16 Mar 2022 at 08:19, Patrick Karton <patrickarton@hotmail.com> wrote:
>
> i want to remove the First Via Header received from uac to kamailio.
>
> so in my script i use remove_hf("Via") but in the relayed request  i see that  ";received=x.x.x.x;rport=xxxx" is left without any header before it.
>
> i think internally kamailio adds a lump before i call the remove_hf function.
>
> how to do it properly ?
>
> Thanks
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