PBX Call Control During Incoming Ringing
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Solution Overview
Problem
In conventional telephone systems, users who make frequent calls face inconvenience as they cannot perform a calling operation during an incoming call ringing state, as all telephones must be set to either ring or not ring collectively, leading to missed notifications and operational limitations.
Innovation Solution
A private branch exchange system with a control unit and call control program that allows users to select a response or make a call during incoming call ringing by outputting special dial tones and enabling specific button operations to differentiate between call responses and call initiations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all telephones are set to perform incoming call ringing, then incoming call notification is ensured, but users cannot make calls during ringing
Solution Approach 1:
The patent applies local quality by differentiating the function of each telephone based on its state. When a telephone is in ringing state, it maintains the ability to receive calls (global function) while allowing the user to initiate new calls (local exception). This is achieved by detecting the ringing state and enabling call initiation through specific button operations, thus resolving the contradiction between ensuring notification and enabling calling operation.
2Ease of operation
If telephones are grouped into ringing and non-ringing groups, then calling operation is enabled during ringing for non-ringing telephones, but system complexity increases
Solution Approach 1:
The patent applies universality by making all telephones capable of both ringing and non-ringing functions through a unified control mechanism. The exchange controls each telephone's state dynamically, allowing any telephone to switch between ringing and non-ringing modes as needed. This eliminates the need for permanent grouping and complex settings, reducing system complexity while maintaining operational flexibility.
3Ease of operation
If telephones are set not to perform incoming call ringing, then calling operation is available, but incoming call notification is lost
Solution Approach 1:
The patent applies dynamics by making the telephone's ringing state changeable rather than fixed. Each telephone can dynamically switch between ringing and non-ringing states based on user needs and exchange control. This dynamic state management allows the system to adapt to different situations, ensuring notification when needed while enabling calling operations when required, thus resolving the contradiction between notification reliability and operational ease.
Data Source
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AI summary
Control means of an exchange comprising connection means for accommodating a telephone and the control means for controlling the accommodated telephone, receives a dial signal from the telephone without causing the telephone to respond to an incoming call when the telephone that is performing incoming call ringing is hooked off, causes the hooked-off telephone to respond to the incoming call when the received dial signal is a first dial signal, and causes the telephone as a call source to make a call without causing the hooked-off telephone to respond to the incoming call when the received dial signal is a second dial signal. Thereby, it is possible to make a call even during incoming call ringing.