The below map diagram illustrates the OpenSMPP Box of Kannel. It should be noted here that the main use for Kannel is to link HTTP-based services to various SMS centers using obscure protocols. WAP, short for Wireless Application Protocol, is a collection of languages and tools and an infrastructure for implementing services for mobile phones. In simpler words, Kannel is a compact and very powerful open source WAP and SMS gateway used widely across the globe to serve trillions of short messages (SMS), WAP Push service indications, and mobile internet connectivity. Use EdrawMax Online to create a similar kind of diagram to illustrate the Kannel and how it helps implement services.