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SMS and WAP gateway

Kannel functions as an SMS (Short Message Service) gateway and as a WAP (Wireless Application Protocol) gateway. The functions are independent, and can be used separately or both at once. When used as an SMS gateway, Kannel can receive messages from one or more SMS centers and convert them into HTTP requests. It also has an HTTP interface for sending messages back to the SMS centers, and it can send text responses directly from a configuration file. Kannel supports the following SMS center protocols:

  • CIMD 1.3 and CIMD 2.0 over IP
  • SMPP 3.3 over IP
  • UCP/EMI 2.0 over IP and serial
  • SEMA SMS2000 OIS 4.0 and 5.0 over Radiopad and X.25

Kannel can also exchange messages with a mobile phone or GSM modem, in effect using it as an SMS center. When used as a WAP gateway, Kannel functions as described in the http://www.wapforum.org (WAP Forum) specifications, except that not all mandatory features of the WAP 1.1 conformance release have been implemented yet. Currently it supports:

  • WSP: connection oriented and connectionless modes.
  • WTP: class 0 and 2.
  • WDP: UDP bearer (GSM datacalls and GPRS).
  • WML and WMLScript compilers.


User intro and reference included; Programmer introduction included



version 1.4.4 (stable)
released on 1 August 2014

VCS Checkout

:pserver:anonymous@cvs.kannel.org:/home/cvs gateway




Verified by

Verified on


Verified by

Janet Casey

Verified on

21 December 2001

Leaders and contributors

Aarno Syvnen Contributor
Markku Rossi Contributor
Andreas Fink Contributor
Mikael Gueck Contributor
Derry Hamilton Contributor
Sanna Sepp&aumlnen Contributor
Hao Shi Contributor
Stipe tolj Contributor
Joerg Pommnitz Contributor
Taneli Lepp&auml Contributor
Kean-Leong Ang Contributor

Resources and communication

AudienceResource typeURI
Bug TrackingVCS Repository Webviewhttp://www.kannel.org/bugs.shtml
Debian (Ref)https://tracker.debian.org/pkg/kannel

Software prerequisites

Required to uselibxml 2.4.0 or higher
Required to builddocbook
Required to buildGNU make
Required to buildlibxml 2.4.0

This entry (in part or in whole) was last reviewed on 20 February 2018.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.