Call Transfer

A call connection routing feature that transfers a call from one telephone or extension to another. Call can occur at various stages of the call conversation through the use of a system call request feature. The system special service request feature is often called a Flash feature. The flash feature is created to indicate a desire to recall a service function or to activate a custom calling feature (such as a call transfer request).

A flash feature service request can be created when the user initiates a short on-hook interval or through the sending of a special service request message. The short on-hook interval is created by a momentary operation of the telephone switch hook, during a prolonged off-hook period. The special service request message can be sent by a button on a telephone (such as a PBX telephone) or by pressing the SEND key on a mobile telephone.

This diagram shows a typical call transfer process used in a private telephone system. In this example, a caller is connected from the public telephone network to extension 1001 via incoming line 0001 on a telephone system (PBX). The user on extension 1001 desires to transfer the call to extension 1011. The first step involves extension 1001 sending a hold signal to the telephone system that allows it to place incoming line 0001 on hold. This is followed by the user at extension 1001 sending the digits indicating the destination of the call transfer (1011). The system then connects...