Patent ID: 8923848

Claim:
A telephone switch connected to both of an extension for connecting devices included in a network on premises and an outside line for connecting devices through a network outside the premises, the telephone switch comprising: a receiving dial table in which dial data to be used when picking up, from a mobile terminal, an incoming call to a fixed telephone set connected to the telephone switch via the extension is registered, the mobile terminal being connected to the telephone switch via the outside line; a conversion dial table in which a call pick-up number to be used in the telephone switch when picking up an incoming call to the fixed telephone set is registered; a dial conversion unit configured to, when dial data sent from the mobile terminal via the outside line is received when there is an incoming call to the fixed telephone set, determine whether the received dial data coincides with the dial data in the receiving dial table, and when both the dial data coincide with each other, and convert the received dial data to the call pick-up number in the conversion dial table; and a call pick-up function unit configured to enable the mobile terminal to pick up, via the outside line, the incoming call to the fixed telephone set by using the call pick-up number for switching of the incoming call.