Telephone exchange apparatus, telephone system, telephone exchange method, and program

A telephone exchange apparatus comprising:

• a memory storing instructions;
• and
• a processor configured to execute the instructions to:
• acquire event information of a user having a user ID in a case where an incoming call including the user ID is detected, the event information indicating a schedule event;
• extract location information of the user from the event information;
• specify a telephone terminal to which the user is most likely to respond among telephone terminals on a basis of the location information, the telephone terminals having been used by the user in a past;
• and
• cause the specified telephone terminal to ring,
• wherein the processor is configured to:
• in a case where an outgoing-call operation or a response operation from a telephone terminal is detected:
• acquire event information of a user having a user ID associated with the telephone terminal;
• extract location information from the event information;
• generate an operation log in which a telephone terminal ID, an operation date and time, and the location information are associated with each other, and store the operation log in the memory;
• in a case where an incoming call including the user ID is detected:
• calculate a response probability for each telephone terminal ID corresponding to the user ID on a basis of the operation log stored in the memory;
• and
• specify a telephone terminal ID having a highest response possibility from among telephone terminal IDs corresponding to the user ID on a basis of the operation log.