PURPOSE: To attain a trunk line call without any fail without inputting the designation of pause in storing a telephone number by receiving a signal detecting a call tone from a station exchange and sending a selection signal of a destination.

CONSTITUTION: A destination designation section 1 outputs a destination signal 21 designating a destination and a control signal 22 indicating the closing of an input terminal equipment of a line 7 by switch operation. A selection signal generating section 2 receives a destination signal 21 and sends a 1st selection signal 23 to connect the line 7 stored in advance to the station exchange 6. On the other hand, a network control section 3 receives the control signal 22 to close the input terminal of the line 7 and to send the 1st selection signal 23 and connects the line 7 to a trunk line 8 by a private branch exchange 5. A call tone identification section 4 identifies a call tone 25 from the station exchange 6 successively and when the section 4 identifies the call tone, it outputs a call command signal 26 to send a 2nd selection signal 24 to the line 7.