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1. DE000029508201 - Schaltungsanordnung zum Schutz gegen einen Fremdeingriff in ein drahtgebundenes Telefonnetz

Office Germany
Application Number 29508201
Application Date 12.05.1995
Publication Number 000029508201
Publication Date 24.08.1995
Publication Kind U1
IPC
H04M 1/66
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
1Substation equipment, e.g. for use by subscribers
66with means for preventing unauthorised or fraudulent calling
H04M 3/38
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
3Automatic or semi-automatic exchanges
38Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections
H04M 3/42
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
3Automatic or semi-automatic exchanges
42Systems providing special services or facilities to subscribers
CPC
H04M 1/66
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
1Substation equipment, e.g. for use by subscribers
66with means for preventing unauthorised or fraudulent calling
H04M 3/38
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
3Automatic or semi-automatic exchanges
38Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections
Applicants VIEHMANN MATTHIAS DIPL ING
Priority Data 4421615 21.06.1994 DE
Title
(DE) Schaltungsanordnung zum Schutz gegen einen Fremdeingriff in ein drahtgebundenes Telefonnetz
Abstract