This is a very basic question, but can someone let me know what this line means? if($si==$sel(cfg_get.pstn.gw_ip)) return 1; return -1; Thank you, A -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.sip-router.org/pipermail/sr-users/attachments/20130826/4100260f/attachment.html>