]> Architecture and Design Lars Wirzenius Gateway architect Wapit Ltd

liw@wapit.com http://www.wapit.com http://www.kannel.org

Kalle Marjola Gateway specialist Wapit Ltd

rpr@wapit.com

This document describes the software architecture of Kannel, the Open Source WAP Gateway being produced by Wapit Ltd. It is meant for programmers wishing to understand or modify the gateway. &requirementschapter; &externalschapter; &internalschapter; &intercomponentchapter; &bearerboxchapter; &smsboxchapter; &wapboxchapter; &bibliography; To be maintained by Lars, mainly. These are some of the open issues: how to avoid making the bearer box a performance bottle neck how components are started (needs to be convenient) c/m/c implementation order terminal/user identification, authentication, billing sms/wap boxes use heartbeat to inform their load to the bearer box centralized configuration? how little config can sb/wb get away with? add host/thread/data structure/code module legends to figure /cgi-bin/sendsms? which box? tid caching, validation, verification: esp. how this is done with many wap boxes tid generation at gateway: needs to be monotonous even with many wb's?