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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.931, 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-142ECMA-148 and ISO/IEC 11584.

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

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CategoryData communication – PISN


Technical CommitteeTC32

ISO/IEC number11572

ETSI numberEN 300 172


  • ECMA-143, 1st editionNo file available
  • ECMA-143, 2nd edition, December 1992 Download
  • ECMA-143, 3rd edition, June 1997Download