PABX Line Selection via Identifier Mapping for Pseudo Private Lines
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Solution Overview
Problem
In intracompany communication systems using VoIP over networks like LAN or WAN, private branch exchanges often occupy all lines, preventing external connections due to the lack of reserved private lines between each pair of exchanges.
Innovation Solution
A line selection method and system that assigns a common identifier to specific lines between pairs of private branch exchanges, allowing them to establish a pseudo private line by using lines with the same identifier for communication, even if the initially selected line is unavailable, ensuring consistent communication channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If private branch exchanges use shared network lines without reserved private lines, then network resource utilization is improved, but communication reliability deteriorates because specific exchanges may occupy all lines preventing external connections
Solution Approach 1:
The patent segments the network lines by assigning unique identifiers to specific line combinations between private branch exchanges. Each identifier represents a dedicated communication path, dividing the shared network resources into logically separated channels that guarantee connectivity for specific exchange pairs while maintaining overall network sharing.
2Reliability
If fixed connection lines are reserved exclusively for communication between specific points, then communication reliability is improved, but device complexity increases due to line management requirements
Solution Approach 1:
The patent uses identifier copying as a simplified mechanism to establish private lines. Instead of complex physical line management, the system copies identifier information between sending and receiving exchanges, allowing either exchange to initiate communication by simply using the other's identifier. This reduces line management complexity while maintaining reliable dedicated communication paths.
3Ease of operation
If pseudo private lines are established using identifier-based line selection, then ease of operation is improved for establishing private lines, but line selection complexity increases at the receiver
Solution Approach 1:
The patent implements self-service line selection where the receiving private branch exchange automatically determines the appropriate line using the identifier contained in the incoming call information. The system performs self-service by matching the received identifier with stored identifier-line mappings, eliminating the need for manual line selection or complex external coordination while simplifying the establishment of private lines.
Data Source
AI summary
External lines 22 connected to a LAN 30 to establish pseudo private lines and having individual line numbers (for example, 5 and 3) are preliminarily assigned with the same identifier (for example, ID2). A sender PABX 10 transmits a call to a receiver PABX 10T and sends call information including ID2 of the line having the line number 5. The receiver PABX 10T acquires ID2 from the call information, selects the line having the line number 3 and assigned with ID2, and uses the line for communication. Between the two PABXs 10 and 10T, a combination of the lines having the line numbers 5 and 3 corresponding to ID2 can be fixedly used as the pseudo private line.