The invention relates to an operations and maintenance center for a telecommunications system comprising:

    • server means 5 for storing of first information being indicative of network elements of the telecommunications system and of second information being indicative of assignments of network elements and resource managers 2,
    • information retrieval means 12 for generating third information being indicative of network elements being assigned to one of the resource managers.

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    < E-mail synchronization between heterogeneous mail servers

    < Communication of intelligent network signaling between a SSP and an external intelligent peripheral

    > System and method for creating a personal directory

    > Tone detector judging a detection of a predetermined tone signal by comparing a characteristic quantity of the tone signal with characteristic quantities of other signals
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