[Serusers] Changing the destination port

Hi all We are trying to install a firewall in our structure. The problem is: the firewall (between X.Y.Z.A and X.Y.Z.B) manipulates the packets, but it changes de SRC port when it sends to the SER (X.Y.Z.B). X.Y.Z.A:5060 ----> X.Y.Z.B:5060 (dump in X.Y.Z.A) X.Y.Z.A:10080 ----> X.Y.Z.B:5060 (doing a dump in X.Y.Z.B) When X.Y.Z.B answer to X.Y.Z.A, it uses the port 10080: X.Y.Z.B:5060 ----> X.Y.Z.A:10080 It break the comunication, because X.Y.Z.A isnt listening at 10080. I need to force the SER to send the messages back to 5060. There are any way to do it? Thanks a lot. Bruno Machado __________________________________________________ Faça ligações para outros computadores com o novo Yahoo! Messenger http://br.beta.messenger.yahoo.com/