Method and appliance for transmitting supplementary information to telephone subscribers, with facility for selecting alternative telephone company

摘要

When a subscriber (A) dials a subscriber (B) through an alternative company the request is routed through communication equipment (VM) of that company before the two are connected. Here the call is routed to an additional information unit (WIM) and the charges accruing to the caller are calculated and stored in the accounting equipment (ACC,ACC-MEM)