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Standard ECMA-225
Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Transit Counter Additional Network Feature (QSIG-TC)

2nd edition (June 1997)

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 Link to non-Ecma site. Ecma is not responsible for the contents of the site..

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:

File name Size (Bytes) Content
ECMA-225.pdf 75 852    Acrobat (r) PDF file

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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