PBX Outside Incoming Call Transfer Routing Control
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Solution Overview
Problem
Conventional systems for network-connected PBXs fail to utilize the outside originating route correctly when transferring calls from one PBX to another across different geographical areas, leading to incorrect dialing due to differences in area codes.
Innovation Solution
A method and system that control outside incoming call transfers by transmitting a transfer instruction signal through the network, analyzing routing information, and originating calls using the same outside line as the transfer source terminal, ensuring correct routing and preventing incorrect dialing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional systems transfer calls between network-connected PBXs using standard routing, then calls can be transferred between different systems, but incorrect dialing occurs due to area code differences when transferring to outside lines
Solution Approach 1:
The system performs preliminary identification of the transfer source terminal's outside originating route before the call transfer occurs. By pre-fetching and storing routing information (including area codes and outside line configurations) associated with the transfer source terminal, the system prepares the correct dialing parameters in advance, preventing incorrect dialing when transferring calls to outside lines across different PBXs.
Solution Approach 2:
The patent introduces an intermediary routing information table that mediates between the transfer source terminal and the transfer destination. This table stores pre-configured outside originating route information, acting as a mediator that provides the correct area codes and dialing parameters to the transfer destination PBX, thereby resolving the area code mismatch problem when transferring calls between PBXs in different geographical areas.
2Reliability
If the system uses the transfer source terminal's outside originating route for call transfers, then correct dialing is achieved, but additional routing information processing is required
Solution Approach 1:
The system performs preliminary identification and storage of routing information associated with each transfer source terminal before call transfers occur. By pre-fetching and caching outside originating route data (area codes, outside line configurations) in a routing information table, the system avoids complex real-time routing calculations during call transfers, thereby reducing processing complexity while maintaining high dialing accuracy.
3Reliability
If routing information is stored and processed for each transfer source terminal, then correct outside line dialing is achieved, but system resources are consumed
Solution Approach 1:
The patent creates a universal routing information table that serves multiple transfer source terminals simultaneously. By consolidating common outside originating route information (such as area codes and outside line configurations) into a shared table structure, the system avoids duplicating identical routing data for each terminal, thereby reducing overall data storage requirements while maintaining accurate routing for each terminal's call transfers.
Data Source
AI summary
A system comprising a plurality of network-connected private branch exchanges (PBXs), wherein an outside originating route of a transfer source terminal is applied at call incoming from an originating terminal of the other PBX to a transfer source terminal having a setting of an outside incoming call transfer of a user's own PBX. Upon call incoming from an originating terminal to a transfer source terminal, a PBX accommodating the transfer source terminal transmits a transfer instruction signal including transfer information enabling identifying a PBX accommodating an outside line (a public network) of a transfer destination to a PBX accommodating an originating terminal. The transfer instruction signal is made to pass PBXs other than the PBX accommodating the originating terminal. Upon receiving the transfer instruction signal, the PBX accommodating the originating terminal identifies the PBX accommodating the outside line of the transfer destination by analyzing the transfer information and transmits a transfer originating signal. This causes the PBX accommodating the outside line of the transfer destination to originate an outside call to the transfer destination.