| 摘要 |
A digital private branch exchange with telephone charge transmission with an exchange-line adapter preceding a private branch exchange switchboard, which adapter is connected via one or more PCM30-type multiplex channels to a digital switching system in an ISDN-capable network. To be able to forward charge information to terminals in such a system, it is provided that the exchange-line adapter (32) has a circuit arrangement (36, 37, 38, 39, 58, 59) which processes D-channel signals and which, if necessary, can be connected to the terminals (34) connected to the private branch exchange switchboard (31). <IMAGE> |
