Can't connect signal "on-receiving-rtcp".

[simba9]

I read this post 
http://gstreamer-devel.966125.n4.nabble.com/How-to-connect-on-receiving-rtcp-signal-in-rtpsession-td4689263.html#a4689301
<http://gstreamer-devel.966125.n4.nabble.com/How-to-connect-on-receiving-rtcp-signal-in-rtpsession-td4689263.html#a4689301>  
. And I try run this code:
    GObject *session = NULL;
   g_signal_emit_by_name (rtpbin, "get-internal-session", 0, &session);
But  after I run this func  g_signal_emit_by_name (rtpbin,
"get-internal-session", 0, &session);, i get NULL in variable session. How
connect  "on-receiving-rtcp" ?




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