摘要:
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.
摘要:
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.
摘要:
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").
摘要:
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.