Note: This howto aims to configure the Microsoft Office Communicator service provided by CERN in any compatible client.

Note2: There is another howto on how to configure it in Pidgin.

Using CERN Office Communicator with any compatible client

Configuration parameters

  • Procotol: Office Communicator / OCS / Live Communicator / LCS
  • Username: YOUR CERN EMAIL (with
  • Server: (try to leave this empty, it should be able to auto discover it)
  • Port: 5061 (try to leave this empty, it is the default port for this service)

Compatible clients

More information

  • Microsoft Office Communications Server uses a modified and incompatible Session Initiation Protocol (SIP) for signalling along with the SIMPLE extensions to SIP for IM and presence.
  • OCS Official Web
  • OCS Wikipedia entry

Suggestions: If you have suggestions, please send me an email to

-- DavidHorat

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Topic revision: r4 - 2010-09-06 - PeterJones
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