If you have purchased the "Extended Call Routing" option pack, you can create your own scripts using the Graphical Script Editor. You can sign these scripts so that they can only be run on SwyxServers whose serial numbers are explicitly given in the script.

See also https://help.swyx.com/cpe/13.20/GSE/Swyx/en-US/index.html#context/help/serial_number_restriction_$.