Elevator Emergency Telephone CLI Test Call Processing
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Solution Overview
Problem
Elevator emergency telephones often incur unnecessary costs and operational complexity due to the underutilization of Caller Line Identification (CLI) in test calls, as CLI is not always active by default and can be costly to activate, and many devices do not support CLI-based test calls, leading to difficulties in identifying the calling elevator and managing test call communications.
Innovation Solution
A method and system that utilize CLI information in processing test calls from elevator emergency telephones by detecting CLI in incoming call attempts and either disconnecting the call or determining completion based on predetermined time thresholds, allowing for efficient test call processing without requiring modifications to the elevators, thus enabling cost reduction and simplified management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If CLI information is detected and utilized in incoming call attempts, then the ability to identify the calling elevator is improved, but the complexity of processing test calls increases
Solution Approach 1:
The system performs preliminary detection of CLI information in the incoming call attempt before fully processing the call. By detecting the caller line identification early in the call setup phase, the system can identify the calling elevator without requiring the call to be answered, thus preventing cost incurrence while maintaining identification capability
Solution Approach 2:
The system extracts only the necessary CLI information from the incoming call attempt and discards the rest of the call processing. By taking out just the caller identification data and using it to complete test call processing, the system avoids the complexity of full call handling while still achieving the identification goal
2Loss of information
If the call is answered to identify the elevator, then the caller identification is ensured, but phone costs are incurred for the caller
Solution Approach 1:
The system performs preliminary detection of CLI information in the incoming call attempt before fully processing the call. By detecting the caller line identification early in the call setup phase, the system can identify the calling elevator without requiring the call to be answered, thus preventing cost incurrence while maintaining identification capability
3Quantity of substance
If multiple elevator emergency phones share one phone line, then the installation cost is reduced, but the ability to identify the specific calling elevator is lost
Solution Approach 1:
The CLI information acts as an intermediary that bridges the gap between multiple phones sharing a line and the need for specific identification. By detecting the CLI in the incoming call attempt, the system can distinguish which specific elevator is calling even though multiple elevators share the same physical phone line
Data Source
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Figure 1b
Figure 1c
AI summary
The invention allows utilizing Caller Line Identification (CLI) feature in receiving test emergency calls from any kind of elevator emergency telephones. A call attempt including CLI information from an elevator emergency telephone is received at an elevator emergency call receiver unit. The CLI information is detected. Then, one of the following is performed: a) disconnecting the call attempt to complete the test call processing; b) in response to detecting the call attempt being released by the elevator emergency telephone within a predetermined time period, determining that the test call processing is completed; and c) in response to detecting the call attempt not being released by the elevator emergency telephone within the predetermined time period, answering the incoming call to enable the elevator emergency telephone to continue the test call processing.