Currently unless you disable fatal warnings, the build of telepathy-glib fails because the docs for TpCallStream::local-sending-state-changed don't match the signal definition. It turns out that the signal definition itself is wrong:

  /**
   * TpCallStream::local-sending-state-changed:
   * @self: the #TpCallStream
   * @state: the new #TpSendingState
   * @reason: the #TpCallStateReason for the change
   *
   * The ::local-sending-state-changed signal is emitted whenever the
   * stream sending state changes.
   *
   * Since: 0.17.5
   */
  _signals[LOCAL_SENDING_STATE_CHANGED] = g_signal_new ("local-sending-state-changed",
      G_OBJECT_CLASS_TYPE (klass),
      G_SIGNAL_RUN_LAST,
      0, NULL, NULL, NULL,
      G_TYPE_NONE,
      4, G_TYPE_UINT, G_TYPE_UINT, TP_TYPE_CALL_STATE_REASON,
      G_TYPE_HASH_TABLE);

The docs have two parameters, the signal definition 4 parameters, and when emitted:

  g_signal_emit (self, _signals[LOCAL_SENDING_STATE_CHANGED], 0,
      self->priv->local_sending_state, r);

2 again. I'm surprised this isn't causing crashes - most likely this code never gets hit.