how to stream a microphone over a lan?

[Luca Della Ghezza]

Well, in a another question in this mailing-list I learned that
gstreamer can manage gconf data.
I have a simple script that connect two pc through ssh and open an audio
connection using "arecord | aplay" command. Now I wish to switch to
gstreamer, because it can use gconf data and detect automatically the
audio device for the mic (gconfaudiosrc).
I tried this simple pipe in local and it works:
gst-launch gconfaudiosrc ! volume volume=1.5 ! alsasink

Now I wish to try to stream the mic, this way:
server side (192.168.0.2)
        gst-launch gconfaudiosrc ! tcpserversink host=192.168.0.1
port=5000
client side (192.168.0.1)
        gst-launch tcpclientsrc host=192.168.0.2 port=5000 !
autoaudiosink

(I need to use TCP because the router filters UDP)

But it doesn't work, on the client side it says that there is a format
error because it can't negotiate the format.

I hardly tried to search the web looking for a solution, but the few
solutions I founded was not working. 
Please can someone tell me how I can write the 2 pipes or where I can
find documentation about this?

Thank you so much.

Luquino
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