| 摘要 |
Signals which are to be transmitted via telecommunication links and each comprising a signalling signal and a content signal are monitored, via monitoring means, by remote processing means. By having the monitoring means generate a further signalling signal, dependent upon a code word related to a signalling signal, and consequently transmitting, dependent upon the further signalling signal, a content signal which is to be monitored to the processing means, a substantial efficient method is obtained as both means can be coupled via a public telephony network. Furthermore, the possibility arises not only to transmit a content signal which is to be monitored to the processing means but also a signalling signal, especially if the telephony network is a so-called ISDN network which uses one or two B channels and one D channel for each telecommunication link which has been established and has to be monitored.
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