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The SIPE Project

A third-party Pidgin plugin for Microsoft LCS/OCS | GNU GPL

Last Modified: 2010-07-22


Bits and pieces from previous versions of these web pages. Please note that these were copied as-is and are no longer updated, therefore links are broken or will likely stop working in the future.

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Pidgin (before called Gaim) is a multiprotocol instant messenger for Linux (and other plataforms). SIP is another popular protocol used for VoIP, and it also has an IM (Instant Messenger) analog in the form of SIP/SIMPLE. The SIP/SIMPLE is an open protocol with a documented specification. The Microsoft Live Communication Server (LCS) has support very similar the Sip/Simple protocol (indeed is based 100% on it), but it has non standard especifications classical for a MSN product, is an extend version SIP.

For that, I implemented a Pidgin Plug-in for LCS called SIPE (SIP Exchange). I taked the SIP/Simple implementation developed by Thomas Butter for Pidgin. Thomas had success with the NTLM authentication problem for LCS (at least one part), but I found the LCS SIP especification is very incompatible. The original SIP/Simple code needed a lot changes (broken the original especification). Then I decided to add that support building a Pidgin plug-in called SIPE (SIP Exchange).

Why the LCS? Because this Communications server is extensively used on enterprise environments (like intranets, coorporative subnets, etc) like Novell-wise or Lotus-SameTime. But the most important reason: I need this support for my job, because I (always) use Linux. ;)

Do you want to know more about SIP/Simple protocol?, please read this PDF document from Hannu-Pekka Rajaniemi and Kliment Yanev. On page ten they talked about SIP/Simple -LCS 2005.

Thanks for visiting.

Anibal 'fixxxer' Avelar <aavelarfoo at suse dot com>
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