[Twisted-Python] How to send data from another reactor instance

[User User]

Hi,
I have the codes below and I would like to know how is it possible to send out data which came to "a" instance from "b" i mean data to port 2000 go out from port "2001" !?

class fact(DatagramProtocol):
    def datagramReceived(self, datagram, addr):
        self.transport.write( datagram, some_where )

a = reactor.listenUDP(2001, fact())
b = reactor.listenUDP(2002, fact())
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