switch (priv->keepalive_mechanism)
    {
    case SIP_CONNECTION_KEEPALIVE_NONE:
    case SIP_CONNECTION_KEEPALIVE_REGISTER:
      /* For REGISTER keepalives, we use NUTAG_M_FEATURES */
      g_hash_table_insert (option_table,
                           g_strdup ("options-keepalive"),
                           GINT_TO_POINTER(FALSE));
      break;
    case SIP_CONNECTION_KEEPALIVE_OPTIONS:
      g_hash_table_insert (option_table,
                           g_strdup ("options-keepalive"),
                           GINT_TO_POINTER(TRUE));
      break;