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Services for Computer Supported Telecommunications Applications (CSTA) Phase III

9th edition, December 2011

This Standard specifies an interface and services between two entities that request and provide communication services (e.g. Applications, middleware, PBX, IP-PBX, Softswitch, phone, softphone, software devices).

CSTA operates with existing interfaces, so that differences among various existing interfaces are hidden.

Services defined in this Standard allow functional integration between a computing network and a telecommunications network.

This Standard is part of a suite of CSTA Standards and Technical Reports. See documentation.

Download this standard


CategoryData communication – CSTA


Technical CommitteeTC32

ISO/IEC number18051

ETSI numberTS 102 173


  • ECMA-269, 1st editionNo file available
  • ECMA-269, 2nd edition, June 1998Download
  • ECMA-269, Volume 1, 3rd edition, December 1998Download
  • ECMA-269, Volume 2, 3rd edition, December 1998Download
  • ECMA-269, Volume 3, 3rd edition, December 1998Download
  • ECMA-269, Volume 4, 3rd edition, December 1998Download
  • ECMA-269, 4th edition, June 2000Download
  • ECMA-269, 5th edition, December 2002Download
  • ECMA-269, 6th edition, June 2004Download
  • ECMA-269, 7th edition, December 2006Download
  • ECMA-269, 8th edition, June 2009Download


  • ECMA-269, 9th edition, December 2011, changes since the previous editionDownload