I need to understand where from packets received. Now I use something like If $si == "1.2.3.4" { xlog("L_INFO","bla bla bla"); } But I need to check source server not only by IP and PORT, but at Domain too For example if (some_pseudovariable=="pbx.server.com"){ xlog("L_INFO","bla bla bla"); } I can use $fu for example because for some packets it includes domain name of kamailio (i think details not important but this situations can be) Does kamailio have some mechanisms to do that? I searched it at cookbook but not found anything. Thank you