Using the BlackBerry Enterprise Server as an network gateway
When you use the BlackBerry® Enterprise Server as a network gateway, all traffic between your application and the BlackBerry Enterprise Server is encrypted using AES or triple DES encryption. Because the BlackBerry Enterprise Server is located behind the organization's firewall and provides inherent data encryption, applications can communicate with application servers and web servers that are located on the organization's intranet. The BlackBerry® Mobile Data System component of the BlackBerry Enterprise Server includes the BlackBerry MDS Services, which provides an HTTP and TCP/IP proxy service to allow the BlackBerry® Java® Application to use it as a secure gateway for managing HTTP and TCP/IP connections to the intranet.
If your application connects to the Internet, you might be able to use the BlackBerry Enterprise Server as a gateway. Network requests travel behind the organization's firewall to the BlackBerry Enterprise Server, which makes the network request to the Internet through the corporate firewall. Administrators can set an IT policy to make sure that the BlackBerry Enterprise Server is the gateway for all wireless network traffic, including traffic destined for the Internet.
If your application connects to the Internet, you can also use either the BlackBerry® Internet Service or the Internet gateway of the wireless server provider to manage connections.