b/f: Examples/Proxy-CSCF: Need to set_contact_alias() also for UPDATE

examples/pcscf/kamailio.cfg

@@ -655,7 +655,7 @@ route[NAT] {
 #!ifdef WITH_NAT
 	force_rport();
 	if (nat_uac_test("19") && !ds_is_from_list()) {
-		if(is_method("INVITE|SUBSCRIBE")) {
+		if(is_method("INVITE|SUBSCRIBE|UPDATE")) {
 			set_contact_alias();
 		}
 		setflag(FLT_NAT);