SwyxServer requires charging information in order to control the display of charges in the telephony client and in order to create the Call Detail Records. SwyxWare receives charging information from the public network via the ISDN channel from the "Advice of Charge" information element (IE). This section describes in detail how SwyxWare interprets charging information and how the charging information is transmitted to a sub-PBX or an ISDN device, which are switched after SwyxWare.

Furthermore, we will describe how charging information is transmitted via a SwyxLink trunk and how it is saved in the CDRs.