kamailio.cfg: added via1 sanity check in default config

etc/kamailio.cfg

@@ -577,7 +577,7 @@ route[REQINIT] {
 		exit;
 	}
 
-	if(!sanity_check("1511", "7")) {
+	if(!sanity_check("17895", "7")) {
 		xlog("Malformed SIP message from $si:$sp\n");
 		exit;
 	}