Configuring Security Settings for Mobile Devices




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Understanding the Direct Push Technology


The direct push technology uses Exchange ActiveSync to keep data on a Windows Mobile–based device synchronized with data on a Microsoft Exchange server. There is no longer a reliance on SMS for notification.

Direct Push Technology


The direct push technology has two parts: one part resides on the device (client), and the other resides on an Exchange Server SP2 mail server. The following list describes these parts of the technology:

    Windows Mobile–based device with MSFP. The ActiveSync technology on the device manages the direct push communication with Exchange Server. It establishes an HTTP or HTTPS connection with the server for a specified time, and then goes to sleep while waiting for the server to respond. The server responds with either a status indicating that new items were received or that no new items arrived. The device then sends either a synchronization request or another direct push request. The rate at which this occurs is dynamically adjusted based on parameters set by the OEM or Operator and how long an idle HTTP or HTTPS connection can be maintained on the operator network and the customer's Enterprise network.

    Exchange Server 2003 Service Pack 2. This version of Exchange Server includes a direct push component that augments the Exchange ActiveSync infrastructure that supports manual and scheduled synchronization. Exchange Server uses IP-based notifications to deliver e-mail, contact, calendar, and task updates to a device as soon as the information arrives at the server.



When data changes on the server, the changes are transmitted to the device over a persistent HTTP or HTTPS connection that is used for direct push. The time-out value in the mobile operator network identifies how long the persistent connection will be maintained with no activity.

To keep this connection from timing out between updates, the device reissues a request when the server responds. This periodic transmission is referred as the "heartbeat". The heartbeat is what maintains the connection to the server for direct push; each heartbeat alerts the server that the device is ready to receive data.




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Configuring Security Settings for Mobile Devices

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