PBX Controller Absence Message Routing

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Solution Overview

Problem

Existing PBX systems fail to efficiently utilize absence messages set on extension stations when handling incoming calls from outside lines, as these messages are not effectively communicated to callers.

Innovation Solution

A PBX system with a controller that determines the destination extension number and type for incoming calls, performing specific termination processing for voice store equipment and extension stations, including processing of absence messages, to facilitate the transmission of absence messages to outside lines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If the PBX system uses standard termination processing for incoming calls from outside lines, then the system operates with simple processing logic, but absence messages set on extension stations are not transmitted to callers

Engineering Contradiction:

Improveabsence message transmissionVSAvoidtermination processing logic

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The termination processing is segmented into distinct processing paths: one for calls to extension stations and another for calls to voice store equipment. This segmentation allows the system to apply appropriate absence message handling logic to each path, ensuring that absence messages are transmitted when called parties are away without complicating the overall system architecture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system performs preliminary determination of the destination extension type before executing termination processing. By identifying whether the destination is an extension station or voice store equipment in advance, the system can prepare and transmit absence messages proactively, ensuring that callers receive accurate absence information before the call is fully established.

Inventive Principle:

Principle #10Preliminary action

2Loss of information

If the PBX system transmits absence messages for all incoming calls from outside lines, then callers receive complete absence information, but the system cannot distinguish between calls to extension stations and calls to voice store equipment

Engineering Contradiction:

Improveabsence message accuracyVSAvoiddestination extension identification

Core Design Contradiction:

Loss of informationVSDifficulty of detecting and measuring

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The PBX controller acts as an intermediary that receives incoming calls from outside lines, determines the destination extension type, and then routes calls appropriately. This intermediary function enables the system to distinguish between extension stations and voice store equipment, ensuring that absence messages are transmitted only when appropriate while maintaining clear call routing.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS7570747B2Private branch exchange (PBX), voice store equipment, message processing method, program and recording medium

Publication Date: 2009.08.04 PANASONIC HOLDINGS CORP

AI summary

A PBX which accommodates an extension station and voice store equipment, the PBX comprising a controller for controlling interconnection between the extension or the voice store equipment and an outside line, the controller including: a destination extension number determination unit for determining the destination extension number for an incoming call from the outside line; a destination extension determination unit for determining whether the destination extension is the extension station or the voice store equipment based on the determined destination extension number; a voice store equipment termination processing unit for performing termination processing concerning the voice store equipment in case it is determined on the destination extension determination means that the destination extension is the voice store equipment; and an extension station termination processing unit for performing termination processing concerning the extension station in case it is determined on the destination extension determination unit that the destination extension is the extension station.