examples/voip: fix caps and element names for 1.0
examples/voip: fix caps and element names for 1.0

freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,nasserGanjali/QtGStreamer,tswindell/qt-gstreamer,GStreamer/qt-gstreamer,detrout/qt-gstreamer,dejunk/gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,dejunk/gstreamer,GStreamer/qt-gstreamer,dejunk/gstreamer,iperry/qt-gstreamer,GStreamer/qt-gstreamer,tswindell/qt-gstreamer,nasserGanjali/QtGStreamer,knuesel/qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,iperry/qt-gstreamer,detrout/qt-gstreamer,detrout/qt-gstreamer,nasserGanjali/QtGStreamer,tswindell/qt-gstreamer,knuesel/qt-gstreamer,knuesel/qt-gstreamer,iperry/qt-gstreamer