Call signalizing method for e.g. extension in company, involves signalizing incoming call to extension and cellular phone when incoming call received at digital telephone exchange is authorized for extension

摘要

The method involves setting a call forward to a cellular phone (70) for an extension (60) in a digital telephone exchange (40) of a public switched telephone network (20) e.g. integrated services digital network, where the extension is attached to a telecommunication equipment (50) connected with the network. Another call forward is set to the equipment for the extension in the exchange. A determination is made whether an incoming call received at the exchange is authorized for the extension. The call is signalized to both the extension and the phone when the call is authorized.