I don't know if this is what you are looking for, but I do something similar to process the From and To message based on a dialed prefix. Please note below my if statement and feel free to modify it for your own use: if ( search("To: <[Ss][Ii][Pp]:56011") ) { subst('/^To:(.*)sip:56011([0-9]+)@(.*)$/To:\1sip:+\2@\3/ig'); subst('/^From: "(.*)sip:([0-9]+)@(.*)$/From: "+\1sip:+\2@\3/ig'); }; On Fri, 2009-06-19 at 15:43 +0000, Geoffrey Mina wrote: Thanks, but I believe I just found the simpler way to strip, but I'm still not sure how I would check for the existence of the "d". http://www.kamailio.org/dokuwiki/doku.php/core-cookbook:1.5.x#strip_int I need to do something like: if(left($ruri,1) == "d"){ //how do i write this statement? strip(1); } t_relay(); is that correct? thanks, Geoff On Fri, Jun 19, 2009 at 3:23 PM, Pascal Maugeri<pascal.maugeri@gmail.com<mailto:pascal.maugeri@gmail.com>> wrote: _______________________________________________ Kamailio (OpenSER) - Users mailing list Users@lists.kamailio.org<mailto:Users@lists.kamailio.org> http://lists.kamailio.org/cgi-bin/mailman/listinfo/users http://lists.openser-project.org/cgi-bin/mailman/listinfo/users