Kannel is a WAP gateway. It attempts to provide this essential part of the WAP infrastructure freely to everyone so the market potential for WAP services, both from wireless operators and specialized service providers, will be realized as efficiently as possible. It also works as an SMS gateway for GSM networks. Almost all GSM phones can use it to send and receive SMS messages, so this is a way to serve many more clients than just those using a WAP phone. Kannel was among the first WAP gateways to be certified as WAP 1.1 compliant. [edit]
Kannel is a WAP gateway. It attempts to provide this essential part of the WAP infrastruct...
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I recently had the oppportunity (necessity) to set up a web application that interacted with many of the users through SMS messages in addition to the more traditional HTML interface. While there are a number of possible software solutions for GSM modems on Windows, on Unix-like platforms the most commonly used one is Kannel...
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Kannel is a famous, powerful, open source and free SMS gateway and WAP gateway. You can use it to connect to a mobile operator's SMS center (SMSC), or using a GSM mobile phone or GSM modem as a virtual SMS center. Kannel can handle multiple SMS centers and virtual SMS centers. You can specify the SMS center or virtual SMS center that an SMS message should be routed to. This feature is useful in situations such as when you have multiple SMS center/virtual SMS center connections and some of them are cheaper or faster to deliver SMS messages.
Kannel supports the use of AT-capable mobile phones as virtual SMS centers. Most GSM mobile phones are capable to work with AT commands these days. A small list of mobile phones and GSM modems that are known to work as virtual SMS centers with Kannel is available on its web site.
The SMSC access protocols supported by Kannel include SMPP, CIMD, UCP / EMI and SMS2000 / OIS. In addition, Kannel has an HTTP / HTTPS interface that you can use to send and receive SMS messages.
As Kannel is a complex program with lots of functions, it may be hard to use for beginners.