Incoming call forwarding management server, call-back terminal apparatus, and incoming call forwarding system

An incoming call forwarding system for forwarding, to a forward destination terminal apparatus with a call-back function, an incoming call from a call originator terminal apparatus to a forward source terminal apparatus under management of an incoming call forwarding management server,

• wherein the incoming call forwarding management server comprises:
• an incoming call forwarding configuration setting data storing unit configured to store incoming call forwarding configuration setting data representing a correspondence relationship between the forward source terminal apparatus and the forward destination terminal apparatus in a subscription contract of an incoming call forwarding service;
• a relay configuration defining information forming unit configured to extract corresponding incoming call forwarding configuration setting data from the incoming call forwarding configuration setting data stored in the incoming call forwarding configuration setting data storing unit in response to a request for information relating to a forward destination, to form relay configuration defining information defining a relay configuration of the incoming call based on the extracted incoming call forwarding configuration setting data;
• and
• a forward destination information replying unit configured to include the relay configuration defining information formed by the relay configuration defining information forming unit in a forward destination information reply that is a reply to the request for the information relating to the forward destination.