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Abstract

A connection-oriented telecommunication system (SYS) comprises a first network (A), at least one transit network (B, C) and a second network (D). The exchanges (EX, N10,N20, N30, N40) of the net works each comprise a plurality of incoming communication resources (InCS) and outgoing communication resources (OutCS) each storing a pair of a verification accounting reference (VerAccRef) and a remuneration accounting reference (RemAccRef). By determining such a pair of and storing such verification and remuneration accounting reference pairs for each communication-session all forward signalling messages (SFM.sub.j, SFM.sub.i) received by an incoming communication resource (InCS.sub.j) or transmitted by an outgoing communication resource (OutCS.sub.i) and all backward signalling messages (BSM.sub.j, BSM.sub.i) transmitted by the incoming communication resource (InCS.sub.j) and received by the outgoing communication resource (OutCS.sub.i) can be accounted for by a respective verification and remuneration accounting means (VER1, VER2, REM2, VER2) respectively indicated by the accounting reference pair. Since all forward and backward signalling messages can be accounted for, the transit networks can respectively charge each other or the first or second network more accurately for handling the signalling messages of a connection-oriented communication-session.

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