| 摘要 |
The invention relates to a method for determining the authorisation of subscriber stations (TlnA, TlnB), in particular for determining external subscribers, in telephone PABX systems with selection code analysers (WBW) and authorisation evaluators (BAW). To avoid additional circuit costs, authorisation is verified in the case of external subscribers in such a way that the group of the calling subscriber is determined via the authorisation evaluator (BAW) and the group of the called subscriber is determined via an addition (BF1, BF2) to the selection code converter (WCU), and a check is subsequently carried out to establish whether both subscribers (TlnA, TlnB) belong to the same group. <IMAGE>
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