diff --git a/src/nksip_call_uas_transp.erl b/src/nksip_call_uas_transp.erl
index c51e610f..f70198af 100644
--- a/src/nksip_call_uas_transp.erl
+++ b/src/nksip_call_uas_transp.erl
@@ -55,9 +55,9 @@ send_response(#sipmsg{class={resp, Code, _Reason}}=Resp, Opts) ->
         udp ->
             case nklib_util:get_binary(<<"maddr">>, ViaOpts) of
                 <<>> when ViaRPort ->
-                    [#nkconn{protocol=nksip_protocol, transp=udp, ip=RIp, port=RPort}];
-                <<>> ->
                     [#nkconn{protocol=nksip_protocol, transp=udp, ip=RIp, port=ViaPort}];
+                <<>> ->
+                    [#nkconn{protocol=nksip_protocol, transp=udp, ip=RIp, port=RPort}];
                 MAddr ->
                     [#uri{scheme=sip, domain=MAddr, port=ViaPort}]   
             end;