Cellular Phone Number Conversion for WOS Connectivity
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Solution Overview
Problem
Current Wireless Office Service (WOS) systems complicate key operations for callers trying to connect to internal phones, both within and outside the service area, as they require different calling methods and numbers depending on the caller's location.
Innovation Solution
A cellular phone with a memory for storing extension numbers and a conversion table that converts dedicated special numbers into external numbers, allowing automatic disconnection and reconnection through a mobile switching controller to establish connections using the same number and operation regardless of the caller's location within the WOS system service area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different calling methods and numbers are used for callers inside and outside the service area, then connection can be established for both locations, but key operations become complicated
Solution Approach 1:
The patent applies universality by enabling the same calling operation (dialing an extension number) to function both inside and outside the service area. The mobile switching controller automatically detects the caller's location and routes the call appropriately, making the calling interface universal regardless of location. This resolves the contradiction by allowing one operation method to serve multiple locations without complicating key operations.
2Ease of operation
If the same calling operation is used for both inside and outside service area, then key operations are simplified, but connection cannot be established when outside the service area
Solution Approach 1:
The mobile switching controller acts as an intermediary that receives the same calling operation regardless of location, then intelligently routes the call through different paths. For inside-service-area callers, it routes through the WOS system; for outside callers, it routes through the public switched telephone network to the PBX. This mediator approach maintains operational simplicity while ensuring reliable connection establishment for both locations.
3Ease of operation
If automatic number conversion and retransmission are implemented, then seamless calling is achieved, but device complexity increases
Solution Approach 1:
The system applies self-service by automatically detecting whether the caller is inside or outside the service area and autonomously performing number conversion and route selection without user intervention. The mobile switching controller automatically converts extension numbers to appropriate external numbers when needed and manages the entire call routing process, eliminating the need for users to manually handle complex number conversions while keeping the interface simple.
Data Source
AI summary
In a case where a cellular phone exists outside a WOS system service area, the cellular phone receives a not-connectable signal and an audio message from a mobile switching controller. The cellular phone conducts disconnection processing with the not-connectable signal as a turning point. Moreover, the cellular phone stores an extension number and converts a dedicated special number into an external number for retransmission, thus establishing connection to a PBX. After the reception of a connection-accepted signal and an automatic exchange answer message from the PBX, the cellular phone automatically transmits the stored extension number.