Have you looked at comparing a header with a string? like;

if($hdr(Refer-To)=~"^011.*") {
  do something
}
Have you also looked at how to reply? maybe something like:
sl_send_reply("603", "Decline");
then exiting further processing, like:
exit;
Then put it all together, and you got what you're looking for.

or maybe instead of replying with an error, just stop processing if these are attacks?

Regards,

David Villasmil
phone: +34669448337


On Mon, Aug 14, 2023 at 3:41 AM David Cunningham <dcunningham@voisonics.com> wrote:
Hello,

We want to check if the number in a REFER's Refer-To header begins with 011, and if so reject the request as not allowed. What would be the most effective way to do that?

Thanks in advance,

--
David Cunningham, Voisonics Limited
http://voisonics.com/
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782
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