Abstract: The invention relates to a method for establishing a telephone connection to a mobile communications terminal device (11) via a mobile communications network (5, 7, 9), with at least one mobile telephone number being assigned to the mobile communications terminal device (11), wherein a supplement i.e. prefix or suffix as a control parameter is added to the mobile telephone number, the supplement being independent from the mobile telephone number. Before establishing the telephone connection an analysis of this supplement is made and the reachability of the mobile communications terminal device (11) is determined. The “reachability” is that the calling party only wants to make the call if the called party is available in real time i.e. does not want to be forwarded to voice-mail. Another example is that the call should only be established for calls that remain in the same network, so as to save costs. The supplement indicates whether the establishment of a telephone connection shall be initiated or suppressed.

Abstract: The invention relates to a method and a device for carrying out the method for the ability to regulate and control the storage and access of connection-accompanying data of a telecommunications connection. The invention is characterized in that a storage of the data takes place according to to specifications of the respective telecommunications subscriber and/or the respective network operator involved and the recorded data of the telecommunications connection are stored directly in the network of the used telecommunications network and, in this connection are protected from general access. In general, access is only possible after appropriate release by those involved in the telecommunications connection. Third Parties can only have access in the case of appropriate authorization.

Abstract: A method for signaling to a central facility a fault of at least one subscriber line connected to a switching center via a respective connection line having a UK0 interface includes permanently activating the at least one subscriber line using the switching center. Each of the at least one subscriber line is monitored using a respective monitoring device looped into a UK0 interface on the respective connection line. A connection to the central facility is established via a separate subscriber line in response to a fault of a first of the at least one subscriber line detected by the respective monitoring device. An item of information related to the first subscriber line is transmitted to the central facility.

Abstract: A process and a device which are characterized in that at least one first security device is arranged at one subscriber, that at least one second security device is arranged in the exchange, or alternatively, an additional device with at least one second security device is connected upstream from each exchange, the first and the second security devices being able to encode and/or decode and exchange with each other connection establishment and/or service information of the subscriber.

Abstract: Optical waveguides made of quartz glass with reduced infrared absorption and reduced attenuation coefficients are made of glass material composed of atoms having mass numbers higher than that of the natural isotope distribution. The quartz glass or doped quartz glass is made of silicon atoms, of which most or all have the mass numbers 29 and/or 30, as well as of oxygen atoms, of which most or all are composed of isotopes with the mass numbers 17 and/or 18. Atoms of the 76Ge isotope are preferably used for doping with germanium atoms having higher mass numbers than in the natural isotope mixture. Glass with atoms of preferably 30Si and/or 18O are preferably used for optical waveguides based on quartz glass having attenuation coefficients below 0.15 dB/km. As indicated, such optical waveguides are also suitable for transmitting high-energy, pulsed or continuous laser light in a wavelength range from 2.0 to 3.0 &mgr;m. These optical waveguides are also suitable for transmitting holmium laser light at 2.