| 摘要 |
<p>A method is disclosed for determining if the real-time status of an end-user line (4) is busy or idle. The end-user line (4), via which POTS or ISDN services may be provided, connects an end-user device (2) and an exchange (7) that is comprised by a telecom network (1). For determining the real-time status of an end-user line (4) a presence function (5) is used that comprises a process that makes use of the Completion of Calls to Busy Subscriber (CCBS) supplementary service. Because use is made of the CCBS supplementary service, the presence function (5) is able to act like an originating local exchange. In order to determine the real-time status of an end-user line (4), the presence function (5) communicates with the exchange (7), whereby the exchange (7) acts like a terminating local exchange according to the procedures of the CCBS supplementary service. The real-time status of an end-user line (4) is then determined using the real-time status monitoring capability comprised the exchange (7), which status monitoring capability is part of the CCBS supplementary service.</p> |
