When you deploy Exchange 2010 Unified Messaging, your users will have access to their e-mail and voice mail messages from either Microsoft Office Outlook 2007 or Outlook Web App. Additionally, users will be able to use the following features:

• Access to Exchange information   UM-enabled users can access a full set of voice mail features from Internet-capable mobile phones, Outlook 2007, and Outlook Web App. These features include many voice mail configuration options and the ability to play a voice message from either the Reading Pane, using an integrated Windows Media Player, or the message list, using computer speakers.
  
• Play on Phone   The Play on Phone feature lets UM-enabled users play voice messages over a telephone. If the user works in an office cubicle, is using a public computer or a computer that isn't enabled for multimedia, or is listening to a voice message that's confidential, they might not want to or be able to listen to a voice message through computer speakers. They can play the voice message using any telephone, including a home, office, or mobile telephone.
  
• Voice mail form   The Outlook 2007 voice mail form resembles the default e-mail form. It gives users an interface for performing actions such as playing, stopping, or pausing voice messages, playing voice messages on a telephone, and adding and editing notes.
  The voice mail form includes the embedded Windows Media Player and an Audio notes field. The embedded Windows Media Player and notes field are displayed in either the Reading Pane when users preview a voice message or in a separate window when they open the voice message. If users aren't enabled for Unified Messaging or Outlook 2007 hasn't been installed on the client computer, they view voice messages as e-mail attachments, and the voice mail form isn't available.
  
• User configuration   A user who's enabled for Unified Messaging can configure several voice mail options for Unified Messaging using Outlook Web App. For example, the user can configure telephone access numbers and the voice mail Play on Phone number and can reset a voice mail access PIN.
  
• Call answering   Call answering includes answering an incoming call on behalf of a user, playing their personal greeting, recording a message, and submitting it for delivery to their Inbox as an e-mail message.
  
• Outlook Voice Access   There are two UM user interfaces available to UM-enabled users or subscribers: the telephone user interface (TUI) and the voice user interface (VUI). In Exchange 2010, these two interfaces together are called Outlook Voice Access. Subscribers can use Outlook Voice Access when they access the Unified Messaging system from an external or internal telephone. They can use Outlook Voice Access to access their Exchange 2010 mailbox, including their personal e-mail, voice messages, and calendar information. Users can listen to, reply to, create, and forward unread e-mail messages using the telephone.
  
• Subscriber access   The subscriber access feature enables dial-in access for your organization's users. UM-enabled users or subscribers who dial in to the Unified Messaging system can access their mailbox using Outlook Voice Access. Using a telephone, a subscriber or user can:
  
  • Access voice mail
    
  • Listen to, forward, or reply to e-mail messages
    
  • Listen to calendar information
    
  • Access or dial contacts who are stored in the global address list or a personal contact list
    
  • Accept or cancel meeting requests
    
  • Set a voice mail message to let callers know they're away
    
  • Set user security preferences and personal options
    
• Auto attendant   An auto attendant is a set of voice prompts that gives external and internal users access to the Exchange 2010 Unified Messaging system. The telephone keypad or speech inputs can be used to move through the auto attendant menu, place a call to a user, or locate a UM-enabled user and then place a call to that user. An auto attendant gives the administrator the ability to:
  
  • Create a customized menu for external users
    
  • Define informational greetings, business hours greetings, and non-business hours greetings
    
  • Define holiday schedules
    
  • Describe how to search the organization's directory
    
  • Describe how to connect to a user's extension so external callers can call users by specifying an extension
    
  • Describe how to search the organization's directory so external callers can search the organization's directory and call a specific user
    
  • Enable external users to call the operator
    

Exchange 2010 Unified Messaging offers administrators:

• A complete unified messaging system    Exchange 2010 Unified Messaging offers a true unified messaging solution using a single store, transport, and directory infrastructure. The store is provided by the Exchange 2010 Mailbox server role. The transport is provided by the Exchange 2010 Hub Transport server role. All e-mail and voice mail messages can be managed from a single management point, using a single administration interface and tool set. This greatly reduces the overall cost of administration by consolidating infrastructure and training.
  
• An Exchange 2010 deployment and administration model   Using the Exchange 2010 Unified Messaging solution, you take advantage of the Exchange 2010 server design. You aren't required to purchase a new server to run the Unified Messaging server role. More important, you can reuse your Exchange knowledge, including training and troubleshooting methodology, and apply it to managing your voice mail infrastructure.
  
• An Exchange 2010 security model   The Microsoft Exchange Unified Messaging service runs as an Exchange server account. This means that you don't have to create or manage a super user account for Exchange 2010 Unified Messaging.
  
• Consolidation of voice mail systems   Currently, most voice messaging systems require that all the voice messaging system components be installed in every physical office location in an organization. In this kind of arrangement, the voice messaging systems in branch offices are located outside the central office and must be administered onsite. This frequently results in increased administration costs and complexity. Exchange 2010 Unified Messaging lets you manage your voice mail system from a central location. To create a centralized management system for Unified Messaging, you can place all Unified Messaging servers in a datacenter or location and then deploy IP gateways in each of your branch offices that replace the voice messaging system for each branch office. Deploying a centralized voice messaging system in this manner can result in a significant savings in hardware and administrative costs.
  
• Speech enabled auto attendants   When internal or external callers call in to the Exchange 2010 Unified Messaging system, a series of voice prompts assists them in moving through the menu system, which is called an auto attendant. The auto attendant lets the caller connect to a person in an organization or locate a person in the organization so that they can place a call without assistance from a human operator. With an auto attendant, callers hear voice prompts instead of a human operator or receptionist.
  You can create multiple auto attendants in Exchange 2010 Unified Messaging. Each auto attendant is represented as an object. Configuration settings for an auto attendant are made on the Active Directory object and can include language settings, customized menus, and other menu navigation settings. You can also configure each UM auto attendant so that when a user calls in to an auto attendant, the caller can use either dual tone multi-frequency (DTMF) inputs (also known as touchtone inputs) or voice inputs to move through the UM auto attendant menu system. 
  

  Note:
  Installing and running the Unified Messaging server role in a virtualized environment isn't supported.

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In a traditional telephone dial plan, users' extensions that are attached to a PBX or multiple PBXs share a common numbering plan. This makes it possible for users to dial one another's telephone extensions without dialing a full telephone number.

A UM dial plan mirrors a physical telephony dial plan. UM dial plans are required to successfully deploy Unified Messaging on your network.

A UM dial plan is an Active Directory container object that logically represents one or more PBXs that share common user extension numbers. UM dial plans in Unified Messaging require that user telephone extension numbers be unique.

In some telephony networks, multiple PBXs and multiple dial plans exist. In these telephony networks, there can be two users who have identical telephone extensions if the two users who have the same extension number are placed in two separate UM dial plans. Putting the two users in separate dial plans makes their extension numbers unique for Unified Messaging purposes.

The following figure shows how UM dial plans can be used in an organization that has a single forest and multiple physical sites.

How Dial Plans Work

When you integrate a physical telephony network with Unified Messaging, there must be an IP gateway that connects your telephony network with your IP-based network. Each IP gateway in your organization is represented by a UM IP gateway object in Active Directory.

After you install the Unified Messaging server role on an Exchange 2010 computer, you need to associate the UM server with at least one UM dial plan before it will answer calls. You can also associate a single UM server with multiple UM dial plans.

After the UM server is associated with a UM dial plan, you need to create a UM IP gateway and associate it with the UM dial plan that was created.

Creating and associating these objects in Active Directory enables the UM server to receive calls from the IP gateway and then process incoming calls for users who are associated with the UM dial plan. When a call comes in to the IP gateway, the IP gateway forwards the call to a UM server and the UM server tries to match the extension number of the user to the associated UM dial plan. The dial plan is identified from the pilot numbers to which the gateway presents the call.

A UM IP Gateway Active Directory object is a container object that logically represents a physical IP gateway hardware device, an IP PBX, or another SIP server that can interoperate with Unified Messaging. Before the physical IP gateway can be used to process UM calls, it must be represented by an object in Active Directory.

Although there are many types and manufacturers of PBXs, IP gateways, and IP PBXs, there are basically two types of IP gateway component configurations:

• IP PBX   A single device
  
• PBX (legacy) and an IP gateway   Two separate components
  

To support Unified Messaging, one or both types of IP device configurations are used when connecting a telephony network infrastructure to a data network infrastructure.

UM IP Gateway Objects

The UM IP Gateway object is an Active Directory container object that contains one or more Active Directory UM hunt groups and other UM IP gateway configuration settings. UM IP Gateway objects are created in Active Directory to logically represent a physical hardware device known as an IP gateway. The UM IP gateway can represent either an IP gateway or an IP PBX. The combination of the IP Gateway object and a UM Hunt Group object establishes a logical link between an IP gateway hardware device and a UM dial plan.

After the UM IP Gateway object is created, the IP gateway can be linked to or associated with a single or multiple UM hunt groups and UM dial plans. The UM hunt group provides a link between the UM IP gateway and a UM dial plan. By creating multiple UM hunt groups, you can associate a single UM IP gateway with multiple UM dial plans.

Enabling and Disabling UM IP Gateways

By default, UM IP gateways are left in an enabled state after they're created. However, the UM IP gateway can be enabled or disabled. If you disable a UM IP gateway, it can be in one of two disabled modes. The first disabled mode forces all associated UM servers to drop existing calls. The second disabled mode forces the UM server associated with the UM IP gateway to stop handling any new calls presented by the IP gateway.

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In a telephony network, a hunt group is defined as a set of extension numbers that are grouped as a single logical unit. When an incoming call is received, the PBX or IP PBX uses the hunt group to "hunt" for an available or open line, extension, or channel that can be used to receive the call.

Hunt groups are used to efficiently distribute calls into or out of a specific unit. For example, a PBX or IP PBX might be configured to have 10 extension numbers for a sales department. The 10 sales extension numbers would be configured as one hunt group. In a PBX or IP PBX, hunt groups are used to efficiently locate an open line, extension, or channel when an incoming call is received.

Multiple algorithms or methods have been created for use by a PBX or IP PBX to define how the open line, extension, or channel will be located. These include the following:

• Round robin
  
• Most idle
  
• Start with lowest number
  

Creating and defining a hunt group in a PBX or IP PBX reduces the possibility that a caller who places an incoming call will receive a busy signal when the call is received.

Understanding UM Hunt Groups

UM hunt groups are used to define the PBX or IP PBX hunt group from which incoming calls will be received and are very important to the operation of the UM system. The UM hunt group is a logical represents of an existing PBX or IP PBX hunt group. UM hunt groups act as a connection or link between the UM IP gateway and the UM dial plan. A single UM hunt group is associated with at least one UM IP gateway and one UM dial plan.

The pilot number defined for a hunt group in the physical PBX or IP PBX must also be defined for the UM hunt group. A pilot number is a telephone number that points to a hunt group and is the access number for calls that are routed to Unified Messaging servers. The pilot number is used to match the information presented with incoming calls using SIP header on the message. The pilot number enables the UM server to interpret the call together with the correct dial plan so the voice message can be routed correctly. It's very important to configure UM hunt groups correctly, because incoming calls that don't correctly match the pilot number defined on the UM hunt group won't be answered and incoming call routing will fail.

When you create a UM hunt group, you're enabling all UM servers specified within the UM dial plan to communicate with an IP gateway. If you delete the UM hunt group, the associated IP gateway will no longer service calls by using the specified pilot number. If the IP gateway is left without remaining UM hunt groups, the IP gateway won't be able to handle incoming calls.

UM mailbox policies are required when you enable users for Unified Messaging. They're useful for applying and standardizing UM configuration settings for UM-enabled users. You create UM mailbox policies to apply a common set of policies or security settings to a collection of UM-enabled mailboxes. You use Unified Messaging mailbox policies to set UM settings for UM-enabled users, such as the following:

• PIN policies
  
• Dialing restrictions
  
• Other general UM mailbox policy properties
  

For example, you can create a UM mailbox policy to increase the level of PIN security by reducing the maximum number of logon failures before a user will be locked out for a specific group of UM-enabled users, such as executives.

UM mailbox policies are created in the Configuration container in Active Directory by using the Shell or the EMC. By default, a single UM mailbox policy is created every time you create a UM dial plan. The new UM mailbox policy is associated with the UM dial plan and part of the dial plan name is included in the display name of the UM mailbox policy. However, you can create additional UM mailbox policies based on the needs of your organization. Although a single UM mailbox policy is required to enable users for Unified Messaging, you can create additional UM mailbox policies and apply a common set of mailbox policy settings for other groups of users.

The mailbox of each UM-enabled user must be linked to a single UM mailbox policy when the mailbox is enabled for Unified Messaging. After you create a UM mailbox policy, you link one or more UM-enabled mailboxes to the UM mailbox policy. This lets you control PIN security settings such as the minimum number of digits in a PIN or the maximum number of logon attempts for the UM-enabled users who are associated with the UM mailbox policy. If you prefer, you can also control message text settings or dialing restrictions for the same or a different group of UM-enabled mailboxes.

Multiple UM-enabled users can be linked to a single UM mailbox policy. However, a single user can be associated with only one UM mailbox policy. After you create a new UM mailbox policy and link it to a UM dial plan, the UM mailbox policy settings that are defined are applied to the UM-enabled users. The settings that are defined on a UM dial plan and a UM mailbox policy will be applied to all users who are associated with the UM mailbox policy.

The following figure shows how UM mailbox policies can be created to control dialing restrictions and PIN security settings for three different groups.

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Unified Messaging enables you to create one or more UM auto attendants, depending on the needs of your organization. UM auto attendants can be used to create a voice menu system for an organization that lets external and internal callers move through the UM auto attendant menu system to locate and place or transfer calls to company users or departments in an organization.

When anonymous or unauthenticated users call an external business telephone number, or when internal callers call a defined extension number, they're presented with a series of voice prompts that help them place a call to a user or locate a user in the organization and then place a call to that user. The UM auto attendant is a series of voice prompts or .wav files callers hear instead of a human operator when they call an organization that has Unified Messaging. The UM auto attendant lets callers move through the menu system, place calls, or locate users by using DTMF or voice inputs. However, for automatic speech recognition (ASR) or voice inputs to be used, you must enable ASR on the UM auto attendant.

A UM auto attendant has the following features:

• It provides corporate or informational greetings.
  
• It provides custom corporate menus. You can link a menu option to another auto attendant to have more than one level.
  
• It provides a directory search function that enables a caller to search an organization's directory for a name.
  
• It enables a caller to connect to the telephone of, or leave a message for, members of the organization.
  

In Active Directory, each UM auto attendant created is represented as an object. There is no limit to the number of UM auto attendants you can create in Active Directory. Each auto attendant can support an unlimited number of extensions. A UM auto attendant is associated with one, and only one, UM dial plan. However, UM auto attendants can reference or link to other UM auto attendants.

An incoming call that is received from an external telephone number or an internal telephone extension is processed by a UM server and then sent to a UM auto attendant that has been created. The UM auto attendant is configured by the system administrator to use prerecorded voice (.wav) files that are then played over the telephone to the caller and that enable the caller to move through the UM menu system. When you configure a UM auto attendant, you can customize all the .wav files that are used to meet the needs of your organization. For more information about custom prompts in Unified Messaging, see Understanding Unified Messaging Audio Prompts.

For more information about message flow with UM auto attendants, see Unified Messaging Auto Attendant Call Processing.

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Auto Attendant with Multiple Languages

There are situations in which you may have to provide callers with auto attendants that have different languages. The language setting that is available on a UM auto attendant lets you configure the default prompt language on the auto attendant. When you're using the default system prompts for the auto attendant, the default prompt language is the language that the caller will hear when the auto attendant answers the incoming call. This language setting will affect only the default system prompts that are provided when the Unified Messaging server role is installed. This setting won't affect custom prompts that have been configured on an auto attendant. The language selected as the default for the auto attendant is based on the version of Exchange 2010 installed.

When you install the U.S.-English version of Exchange 2010, there will be only one language available to configure on UM auto attendants: U.S. English. However, if you install a localized version of Exchange 2010, for example, Japanese, you will be able to configure the auto attendant you create to use Japanese or U.S. English as the default language. Additional UM language packs can be installed on a UM server to let you use other default language options on an auto attendant.

For example, if you have a business that is based in the United States but requires a menu system that gives callers the options of moving through the system in U.S. English, Spanish, and French, you have to first install the UM language packs that you need. In this case, if you've installed the U.S.-English version of Exchange 2010, you'd install the UM language packs for Spanish and French. However, because a UM auto attendant can have only one language configured at a time, you'd create four auto attendants: a main auto attendant configured to use U.S. English and then one auto attendant for each language: U.S. English, Spanish, and French. You'd then configure the main auto attendant to have the appropriate key mappings to access the other auto attendants you've created for each language. In this example, the main auto attendant would answer the incoming call and the caller would hear, "Welcome to Contoso, Ltd. For English, press or say 1. For Spanish, press or say 2. For French, press or say 3."

Auto Attendant Examples

The following examples demonstrate how you can use UM auto attendants together with Unified Messaging:

• Example 1   At a company called Contoso, Ltd., external customers can use three external telephone numbers: 425-555-1111 (Corporate Offices), 425-555-2222 (Product Support), and 425-555-3333 (Sales). The Human Resources, Administration, and Accounting departments have internal telephone extensions and must be accessed from the Corporate Offices UM auto attendant.
  To create a UM auto attendant structure that supports this scenario, create and configure three UM auto attendants that have the appropriate external telephone numbers. Create three other UM auto attendants for each department in the Corporate Offices. Then you configure each UM auto attendant based on your requirements, such as the greeting type or other navigational information.
  The following figure is a graphical representation of how UM auto attendants can be used in Example 1.
  
  How to configure multiple UM auto attendants with multiple outside business telephone lines
  
• Example 2   At a company called Contoso, Ltd., external customers call one main number for the business, 425-555-1000. When an external caller calls the main number, the UM auto attendant answers and prompts the caller by saying, "Welcome to Contoso, Ltd. Please press or say 'One' to be transferred to corporate administration. Please press or say 'Two' to be transferred to product support. Please press or say 'Three' to be transferred to corporate information. Please press or say 'Zero' to be transferred to the operator." To create a UM auto attendant structure that supports this scenario, you create a UM auto attendant that has customized extensions that route the call to the appropriate extension number.
  The following figure is a graphical representation of how UM auto attendants can be used in Example 2.
  
  How to configure multiple UM auto attendants with a single outside business telephone line
  

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Voice calls that come in to an Exchange 2010 organization can be placed by callers who are inside or outside the organization. When a caller places a call to a UM-enabled user's telephone extension and the user isn't available to answer the call, the PBX forwards or routes the incoming call to an IP gateway and then to the UM server. In a UM system that uses an IP PBX, the IP PBX forwards the incoming message to the UM server. The IP gateway or the IP PBX translates or converts the incoming audio stream into RTP for incoming voice messages. The stream of IP data is then passed to the UM server. After the UM server receives the call, the UM server processes the message and determines how to route the message.

The following figure shows how incoming voice messages flow in an Exchange 2010 organization.

In the previous example, a call arrives at the PBX and is then forwarded to the UM pilot number. The pilot number is mapped to the hunt group that goes to the IP gateway. The IP gateway presents the call to the UM server. The UM server then receives SIP invitation header information such as who the call is for, who the caller is, and why the call was redirected. The UM server then looks up the number that was called and identifies which user was called and which dial plan the user belongs to. From there, the UM server looks in Active Directory to see whether the user is enabled for Unified Messaging. If the user is enabled for Unified Messaging, the caller receives a greeting for the user. Users' greetings are securely stored in their mailbox. This lets them manage their greetings. After callers reach the user's voice mail greeting, they can leave a voice message that will be sent to the user's mailbox. The UM server then records the message, locates a Hub Transport server, and submits the voice message to the Mailbox server that contains the UM-enabled user's mailbox.

When external or anonymous callers place a call by using an external business telephone number, or internal anonymous callers place a call to an internal extension number, they're presented with voice prompts to help them move through the UM menu system. The UM auto attendant is a set of voice prompts or .wav files that are played to callers instead of a human operator or receptionist when they call in to an organization that has Unified Messaging. Unified Messaging lets you create one or more auto attendants, depending on the needs of your organization.

Auto Attendant Message Flow

When a call is received by a UM server, the UM server performs a Lightweight Directory Access Protocol (LDAP) query to an Active Directory domain controller to determine how to handle the incoming call.

The following figure shows the message flow when UM auto attendants are used in an Exchange 2010 organization.

After you have created and enabled the auto attendant for your organization and associated it with a UM dial plan, the auto attendant can start to process calls. When a call for an auto attendant is received, it's first processed by the IP gateway and mapped to the appropriate hunt group. The call is then sent to the UM server. The UM server looks up the auto attendant object in Active Directory and then provides the correct auto attendant to handle the call.

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With Unified Messaging, UM-enabled users or subscribers can access their e-mail, voice mail, contacts, and calendaring information using a standard analog, digital, or mobile telephone. Using Outlook Voice Access, a UM-enabled user can:

• Listen to new and saved e-mail and voice mail messages.
  
• Forward, reply to, save, and delete e-mail and voice mail messages.
  
• Interact with their calendar.
  
• Locate a person in the global address list or their personal Contacts.
  
• Send a voice message to a person.
  
• Change their PIN, spoken name, or greetings.
  

Outlook Voice Access Message Flow

Incoming calls that are received by a UM server from an Outlook Voice Access user are only routed to a Mailbox server to enable users to access their mailbox. However, if a message is submitted by using Outlook Voice Access, for example, a change in the schedule of a meeting, the message is first submitted to a Hub Transport server within the same Active Directory site as the UM server before it's routed to the recipient's mailbox.

The following figure shows how incoming calls and messages placed by subscribers or UM-enabled users flow in an Exchange 2010 organization.

When a user calls in to Outlook Voice Access, the PBX receives the call for the UM number and the IP gateway presents the call to the UM server. The UM server then looks up the user account information in Active Directory and collects information about the user. This information includes dial plan information. If users place the call from their own extension, they're prompted for their PIN. The UM server contacts the Mailbox server and authenticates the user. From there, the UM server and the Mailbox server communicate information back to the user, as requested.