A network-based verification of call connections is provided between a telecommunications subscriber terminal and a telecommunications service device selected by a service call number. This verification provides a way of enabling secure protection against an undesired selection of a service device and/or the selection of an undefined service device. A system and a method are provided in which during a call set-up, the selected call number is evaluated on the basis of at least one service call number stored in a communication network and/or at least one service call number area. In response to the identification of a service call number, the transmission of a defined confirmation information message from the telecommunication subscriber terminal is requested for the verification of the call connection, and in response to a mismatch between the requested confirmation information message and the confirmation information message transmitted, or not, by the telecommunication subscriber device, the call set-up is interrupted.