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Standard ECMA-143
Private Integrated Services Network (PISN) - Circuit Mode Bearer Services - Inter-Exchange Signalling Procedures and Protocol (QSIG-BC)

4th edition (December 2001)

This Standard defines the signalling procedures and protocol for the purpose of circuit-switched Call Control at the Q-reference point between Private Integrated services Network eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN).

The Q reference point is defined in ECMA-133.

This Standard is based upon that described in Recommendation Q.931Link to non-Ecma site. Ecma is not responsible for the contents of the site., including the provisions for symmetrical operation described in annex D of that recommendation.

Service specifications are produced in three stages and according to the method specified in ETS 300 387. This Standard contains the stage 3 specification for the Q reference point and satisfies the requirements identified by the stage 1 and stage 2 specifications in ECMA-142, ECMA-148 and ISO/IEC 11584 Link to non-Ecma site. Ecma is not responsible for the contents of the site..

This Standard is applicable to PINXs which interconnect to form a PISN.

The following file can be freely downloaded:

File name Size (Bytes) Content
ECMA-143.pdf 4 177 081    Acrobat (r) PDF file

This Ecma publication is also approved as ISO/IEC 11572.

The previous replaced "historical" editions of this Ecma Standard are available here.


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