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Exchange Server 2010 server roles (part 3) - Edge Transport Server role

1/13/2011 4:14:35 PM

4 Edge Transport Server (Edge) role

The Edge Server role was introduced with Exchange Server 2007, and provides an extra layer of message hygiene. The Edge Transport Server role is typically installed as an SMTP gateway in the network's "Demilitarized Zone" or DMZ. Messages from the Internet are delivered to the Edge Transport Server role and, after anti-spam and anti-virus services, the messages are forwarded to a Hub Transport Server on the internal network.

Figure 5. The Edge Transport Server is installed between the Internet and the Hub Transport Server.

The Edge Transport Server can also provide the following services:

  • Edge Transport Rules – like the Transport Rules on the Hub Transport Server, these rules can also control the flow of messages that are sent to, or received from, the Internet when they meet a certain condition.

  • Address rewriting – with address rewriting, the SMTP address of messages sent to, or received from, the Internet can be changed. This can be useful for hiding internal domains, for example after a merger of two companies, but before one Active Directory and Exchange organization is created.

The Edge Transport Server is installed in the DMZ and cannot be a member of the company's internal Active Directory and Exchange Server 2010 organization. The Edge Transport Server uses the Active Directory Lightweight Directory Services (AD LDS) to store all information. In previous versions of Windows this service was called Active Directory Application Mode (ADAM). Basic information regarding the Exchange infrastructure is stored in the AD LDS, like the recipients and the Hub Transport Server to which the Edge Transport Server is sending its messages.

To keep the AD LDS database up to date, a synchronization feature called EdgeSync is used, which pushes information from the Hub Transport Server to the Edge Transport Server at regular intervals.

5 Unified Messaging Server role

The Exchange Server 2010 Unified Messaging Server role combines the mailbox database and both voice messages and email messages into one store. Using the Unified Messaging Server role it is possible to access all messages in the mailbox using either a telephone or a computer.

The phone system can be an IP-based system or a "classical" analog PBX system although, in the latter case, a special Unified Messaging IP Gateway is needed to connect the two.

The Unified Messaging Server role provides users with the following features:

  • Call Answering – this feature acts as an answering machine. When somebody cannot answer the phone, a personal message can be played after which a caller can leave a message. The message will be recorded and sent to the recipient's mailbox as an .mp3 file.

  • Subscriber Access – sometimes referred to as "Outlook Voice Access." Using Subscriber Access, users can access their mailbox using a normal phone line and listen to their voicemail messages. It is also possible to access regular mailbox items like messages and calendar items, and even reschedule appointments in the calendar.

  • Auto Attendant – using the Auto Attendant, it is possible to create a custom menu in the Unified Messaging system using voice prompts. A caller can use either the telephone keypad or his or her voice to navigate through the menu.

Figure 6. Overview of the Unified Messaging Infrastructure.

The Unified Messaging service installed on the Unified Messaging Server role works closely with the Microsoft Exchange Speech Engine Service. This Speech Engine Service provides the following services:

  • Dual Tone Multi Frequency (DTMF) also referred to as the touch-tone (the beeps you hear when dialing a phone number or accessing a menu).

  • Automatic Speech Recognition.

  • Text-to-Speech service that's responsible for reading mailbox items and reading the voice menus.

The Unified Messaging Server role should be installed in an Active Directory site together with a Hub Transport Server, since this latter server is responsible for routing messaging to the Mailbox Servers. It also should have a fast connection to a Global Catalog server. If possible, the Mailbox Server role should be installed as close as possible to the Unified Messaging Server role, preferably in the same site and with a decent network connection.

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