Kannel is a compact and very powerful open source WAP and SMS gateway, used widely across the globe both for serving trillions of short messages (SMS), WAP Push service indications and mobile internet connectivity. By using this you can implement your own bulk sms gateway server to send messages from web and receive sms from phone to web. It support different protocols for providing communication using different tools, e.g., CIMD, SMPP for third party service providers like clickatel, business sms etc and AT for mobiles and modems with your sim card. You can also send text messages, logos, audios etc to mobiles by using this gateway. It's used widely across the globe both for serving trillions of short messages (SMS), WAP Push service indications and mobile internet connectivity. It attempts to provide this essential part of the WAP infrastructure freely to everyone so that the market potential for WAP services, both from wireless operators and specialized service providers, will be realized as efficiently as possible. It's a great open source technology for those looking to venture in bulk sms provider services or as a corporate and group communication tool.