Thank you Daniel.
Is it safe to use remove_hf("User-Agent") without check if this header
exist?
or better use if(is_present_hf("User-Agent")) { remove_hf("User-Agent"); } ?
Thank you.
25 нояб. 2016 г. 2:56 PM пользователь "Daniel Tryba" <d.tr...@pocos.nl>
написал:
> On Fri, Nov 25, 2016 at 02:08:07PM +0200, Sergey Basov wrote:
> > Hello All.
> >
> > I have some troubles with upstream sip switch.
> > It ignores SIP packets which contains:
> >
> > User-Agent: FPBX-2.11.0(11.17.1)
> > or
> > Server: User-Agent: FPBX-2.11.0(11.17.1)
> >
> > If space is present before first "(" then sip switch works as expected
> >
> > So my question is: how corektly make analyze and modify this headers
> > using kamailio?
> > In which routes i must parse it?
>
> Since you need to remove the headers first before replacing it if you
> wish, you'll need the textops remove_hf function:
> http://kamailio.org/docs/modules/stable/modules/
> textops.html#textops.f.remove_hf
> which can be used in REQUEST_ROUTE, ONREPLY_ROUTE, FAILURE_ROUTE and
> BRANCH_ROUTE.
>
> If you really want to bother to change these headers you could do
> something like
>
> $var(ua)=$hdr(User-Agent);
> $var(ua)=$(var(ua){re.subst,/(.*)(\(.*\))(.*)/\1 \2\3/});
> remove_hf("User-Agent");
> append_hf("USer-Agent: $var(ua)\r\n");
>
> Which blindly replaces the "(foo)" string by " (foo)" regardless of the
> char before the first "(".
>
> But use the KISS approach: just delete the headers
>
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