[sr-dev] trouble with testing $var

i wrote alias_contact() function and seems to work fine. i have not yet written handle_alias(), but tried to first use scripting means for that. that led into trouble with testing is $var has value. i have this piece of code: xlog("L_INFO", "R-URI is <$ru>\n"); $var(tmp) = $(ru{uri.param,alias}); xlog("L_INFO", "Alias param is <$var(tmp)>\n"); if ($var(tmp)) { xlog("L_INFO", "Alias param is <$var(tmp)>\n"); $du = $var(tmp); xlog("L_INFO", "Routing in-dialog $rm from <$fu> to <$du>\n"); } else { xlog("L_INFO", "Routing in-dialog $rm from <$fu> to <$ru>\n"); } and i get to syslog: Nov 8 12:51:10 localhost /usr/sbin/sip-proxy[4506]: INFO: R-URI is <sip:jh_test_fi@192.98.101.10:5074;transport=tcp;alias="192.98.101.10:55375;transport=tcp"> Nov 8 12:51:10 localhost /usr/sbin/sip-proxy[4506]: INFO: Alias param is <192.98.101.10:55375;transport=tcp> Nov 8 12:51:10 localhost /usr/sbin/sip-proxy[4506]: INFO: Routing in-dialog BYE from <sip:test@as.test.fi> to <sip:jh_test_fi@192.98.101.10:5074;transport=tcp;alias="192.98.101.10:55375;transport=tcp"> why does the test if ($var(tmp)) { fail to figure out that $var(tmp) has value? -- juha