Abstract: A technique is disclosed that provides a conduit for enabling a private branch exchange, or other data-processing system, to initiate the performance of a function on a cellular telephone or other off-premises telecommunications terminal that is affiliated with the exchange. The conduit comprises a client application that resides on the off-premises terminal that observes the calling party identifier of all incoming calls. When the private branch exchange desires to initiate a function on the terminal, the exchange dials the terminal and postpends dialed digits by using dual tone multi-frequency signaling, where the dialed digits identify the particular function call and the arguments of the function.