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Standard ECMA-225 
This Standard specifies the signalling protocol for the support of the Transit Counter additional network feature (ANF-TC) at the Q reference point between Private Integrated Services Network Exchanges (PINXs) connected together within a Private Integrated Services Network (PISN). ANF-TC is a feature that limits the number of Transit PINXs that a call setup request may be routed through e.g., to protect the network against indefinite looping. The Q reference point is defined in ISO/IEC
11579-1 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-224. The signalling protocol for ANF-TC operates in association with the signalling protocols for basic circuit switched call control (as specified in ECMA-143) and call independent (connection oriented) signalling connections (as specified in ECMA-165). This Standard also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between ANF-TC and other supplementary services and ANFs. This Standard is applicable to PINXs that can interconnect to form a PISN. The protocol defined in this Standard forms part of the PSS1 protocol (informally known as QSIG). The following file can be freely downloaded:
This Ecma publication is also approved as ISO/IEC 15056. The previous replaced "historical" edition of this Ecma Standard is available here.
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