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Standard ECMA-285
Protocol for Computer Supported Telecommunications Applications (CSTA) Phase III

2^nd edition (June 2000)

This Standard specifies application protocol data units (APDUs) for the services described in ECMA-269

ECMA-269 defines Services for Computer Supported Telecommunications Applications (CSTA) Phase III. The field of application of this Standard is the interconnection of switches and computers in a private telecommunication environment.

Phase III of CSTA extends the range of features offered by CSTA Phase II.

This standard also provides a Protocol Implementation Conformance Statement (PICS) Proforma to assist implementers.

This, 2nd edition of ECMA-285 is aligned with the 4th edition of ECMA-269, which has been superseded by the 6th edition. The 6th edition of ECMA-269 contains fixes to problems found in earlier editions. Therefore, the 2nd of ECMA-285 has known issues.

Further information on the CSTA topic is also available.

Copy these file(s), free of charge:

File name	Size (Bytes)	Content
ECMA-285.pdf	951 558	Acrobat (r) PDF file
ECMA-285-errata-june01.pdf	14 470	Acrobat (r) PDF file
ECMA-285-source_files.zip	68 047	See below

The file ecma-285-source_files.zip contains the following files:

• ECMA-285-asn.txt - This file, derived from ECMA-285, 2nd edition, contains the ASN.1 source file that can be used with many industry compilers.
• acse_user_info_csta2.txt - This file specifies the "CSTAFunctionality" parameter type that is defined in ECMA-218 (CSTA Phase II Protocol). It needs be compiled with the above file (See 8.2.2 in ECMA-285).
• rose94.txt - This file specifies the Remote Operations ASN.1 definitions. It may be required by come compilers that do not provide the Remote Operations definitions automatically.
• readme.txt - This file contains the above description.

Note: depending upon the compiler used, two duplicate tags can be expected (Reject, ACSEUserInformationForCSTA). These are normal and should not affect the compiled output.

This Ecma publication is also approved as ISO/IEC 18052

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