Siemens Aktiengesellschaft

Guenter Lukas

Siegfried Spahl

Friedrich Ramberger

Dietmar Ratzberger

Peter Giese

Friedrich Kopitar

The method and application apparatus establish performance features in a private communication system of a public communication network. Unsuccessful calls coming in from a public communication system to communication terminal apparatuses (KE1. . . n) of a private communication system (KS), as well as calls (ar', ar') directed to private performance feature communication terminal apparatuses (KE-AUL, KE-RR), are acquired in the private communication system (KS) and reported to the application apparatus(PC). Using the application apparatus (PC), a performance feature, for example call forwarding (AUL) or callback (RR), is set up or, respectively, introduced, dependent on the acquired incoming calls (ar', ar').

Method and application means for establishing performance features in

A communications system includes a processor and associated memory containing information identifying dialing authorizations for a plurality of Personal Identification Numbers thereby a user to enter a personal identification number to receive access to authorized connections.

Method and apparatus for restricting dialing authorization in

In a communication system having a function or performance feature to be protected, the periodic transmission of encoded interrogation information is initiated by a security routine to ensure that the function or performance feature is protected. The protected function is activated and further-executed only if reply information which is also encoded is received from a connected crypto-unit in a predetermined time span after a transmission of the interrogation information.

Method for activating and executing protected functions in a

Buffer memory systems are utilized in communication systems for the transmission of data that arise irregularly over time. These data are stored in memory areas and are subsequently transmitted block-by-block via a data line. The capacity limit of those memory areas is often exhausted, even though an adequate amount of free memory space is still present in the buffer memory system. A buffer distribution method, which is based on a combination of a fixed and of a dynamic buffer allocation method, solves this problem.

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Vienna, Austria

Guenter Lukas