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developerWorks: Build a WAP Gateway On Linux

Jun 13, 2004, 19:30 (1 Talkback[s])
(Other stories by Manas Ranjan Behera)

The WAP gateway works by letting a telephone act as a simple Web browser with optimized markup language, scripting language, and the transmission protocols for wireless-over-the-air use. It talks to the phone using the WAP protocol stack and translates the requests it receives to normal HTTP. Therefore, content providers can use any HTTP server and utilize existing know-how about HTTP service implementation and administration.

"In addition to protocol translations, the gateway also compresses the WML (Wireless Markup Language) pages into a more compact form, which saves bandwidth on the air and further reduces the phone's processing requirements. It also compiles WMLScript programs into a bytecode format.

"There are various commercial WAP gateways available on the market that are quite expensive. Kannel, on the other hand, is an open source gateway; you don't need to pay for it, you can edit the source code yourself, and you can construct your own customized gateway. Because Kannel is being developed on Linux systems (RedHat and Debian), it can be smoothly ported to other UNIX-like operating systems. However, in this article, I illustrate building the gateway for these two Linux systems only..."

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