freetdm: updated variables.txt

libs/freetdm/docs/variables.txt

@@ -49,7 +49,7 @@ When using ftmod_sangoma_isdn, user wants to transmit a custom Facility IE, insi
 
 	ftdm_usrmsg_set_raw_data(&usrmsg, my_facility_ie, my_facility_ie_len);
 	
-	ftdm_channel_call_indicate(ftdmchan, FTDM_CHANNEL_INDICATE_ANSWER, &usrmsg);
+	ftdm_channel_call_indicate(ftdmchan, FTDM_CHANNEL_INDICATE_FACILITY, &usrmsg);
 
 	/* FreeTDM will automatically free my_facility_ie */