how to retransmit using pipeline as udpsrc+rtpbin+udpsink

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i am creating a simple pipeline like this udpsrc+rtpbin+udpsink, but it will not work when i connect "pad-added" of rtpbin. 
i can see some examples using command line to build a pipeline. but now i want to write some code to implement.
can you help me ?thanks a lot.
after seeing client-PCMA.c i write code as follows:


gint
main (int   argc, char *argv[])
{
    GstElement *pipeline;
    GstElement *udprecv1;
    GstElement *rtpbin1;
    //GstElement *multiudpsend1;
    GstElement *udpsend1;


    GstPad *srcpad, *sinkpad;
    GstPadLinkReturn lres;
    GMainLoop *loop;


    gst_init (&argc, &argv);
    
    loop = g_main_loop_new (NULL, FALSE);
    
    pipeline = gst_pipeline_new ("test_transmit");
    udprecv1 = gst_element_factory_make ("udpsrc", "udpsrc1");
    rtpbin1 = gst_element_factory_make ("rtpbin", "rtpbin1");
    udpsend1 = gst_element_factory_make ("udpsink", "udpsend1");


    if (!pipeline || !udprecv1 || !rtpbin1 || !udpsend1) {
        g_print ("One element could not be created. Exiting.\n");
        return 1;
    }


    g_object_set (udprecv1, "port", 20000, NULL);
    g_object_set (udpsend1, "port", 10000, "host", "192.168.6.63", NULL);
    g_object_set (rtpbin1, "do-retransmission", 1, NULL);


    
    gst_bin_add_many (GST_BIN (pipeline),
                    udprecv1, rtpbin1, udpsend1, NULL);


    
    srcpad = gst_element_get_static_pad (udprecv1, "src");
    sinkpad = gst_element_get_request_pad (rtpbin1, "recv_rtp_sink_0");
    lres = gst_pad_link (srcpad, sinkpad);
    g_assert (lres == GST_PAD_LINK_OK);
    gst_object_unref (srcpad);


    /* the RTP pad that we have to connect to the depayloader will be created
    * dynamically so we connect to the pad-added signal, pass the depayloader as
    * user_data so that we can link to it. */
    g_signal_connect (rtpbin1, "pad-added", G_CALLBACK (pad_added_cb1), udpsend1);


  
    /* Set the pipeline to "playing" state*/
    g_print ("Now playing: %s\n", argv[1]);
    gst_element_set_state (pipeline, GST_STATE_PLAYING);




    /* Iterate */
    g_print ("Running...\n");
    g_main_loop_run (loop);




    /* Out of the main loop, clean up nicely */
    g_print ("Returned, stopping playback\n");
    gst_element_set_state (pipeline, GST_STATE_NULL);


    g_print ("Deleting pipeline\n");
    gst_object_unref (GST_OBJECT (pipeline));
    g_main_loop_unref (loop);


    return 0;
}




i have not seen pad_added_cb1 being called back.
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