```ruby
module Adhearsion
  module LDAP

    ##
    # Adhearsion Plugin that defines the LDAP configuration options
    # and includes a hook to start the LDAP service in Adhearsion initialization process
    class Plugin < Adhearsion::Plugin
      extend ActiveSupport::Autoload

      autoload :Service

      # Default configuration for LDAP connection.
      # Configure an LDAP connection using ActiveLdap.  See ActiveLdap::Base.establish_connect
      # for further information about the appropriate settings here.
      config :adhearsion_ldap do
        host                 nil, desc: 'LDAP server host'
        port                 389, desc: 'LDAP server port', validator: -> { |v| v.to_i }
        base                  '', desc: <<-__
          LDAP tree that must be used in the connection
        __
        bind_dn               '', desc: <<-__
          Distinguished Name to bind as (LDAP auth)
        __
        password              '', desc: 'Password credentials'
        allow_anonymous    false, desc: 'valid values: true | false (default)'
        try_sasl           false, desc: 'valid values: true | false (default)'
        models      'app/models', desc: 'directory containing ActiveLdap models'
      end

      # Include the LDAP service in plugins initialization process
      run :adhearsion_ldap do
        Service.start
      end

    end

  end
end
```

Fix check when setting comes from environment var
user
```ruby
module Adhearsion
  module LDAP

    ##
    # Adhearsion Plugin that defines the LDAP configuration options
    # and includes a hook to start the LDAP service in Adhearsion initialization process
    class Plugin < Adhearsion::Plugin
      extend ActiveSupport::Autoload

      autoload :Service

      # Default configuration for LDAP connection.
      # Configure an LDAP connection using ActiveLdap.  See ActiveLdap::Base.establish_connect
      # for further information about the appropriate settings here.
      config :adhearsion_ldap do
        host                 nil, desc: 'LDAP server host'
        port                 389, desc: 'LDAP server port', validator: -> { |v| v.to_i }
        base                  '', desc: <<-__
          LDAP tree that must be used in the connection
        __
        bind_dn               '', desc: <<-__
          Distinguished Name to bind as (LDAP auth)
        __
        password              '', desc: 'Password credentials'
        allow_anonymous    false, desc: 'valid values: true | false (default)', transform: ->(v) { v.to_s.downcase == 'true' }
        try_sasl           false, desc: 'valid values: true | false (default)', transform: ->(v) { v.to_s.downcase == 'true' }
        models      'app/models', desc: 'directory containing ActiveLdap models'
      end

      # Include the LDAP service in plugins initialization process
      run :adhearsion_ldap do
        Service.start
      end

    end

  end
end
```
assistant