Private Branch Exchange Call Extension Without Notification
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Solution Overview
Problem
Current telecommunications systems lack the ability to seamlessly transfer ongoing calls between different terminals without notifying the other party, limiting user mobility and privacy in professional settings.
Innovation Solution
A telecommunications system that allows a user to extend a call from one terminal to another without notifying the other party, using a private branch exchange to affiliate terminals and manage call transfers without providing ring-back or indication of terminal changes, enabling smooth transitions between wireline and wireless devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a user transfers a call between terminals in traditional telecommunications systems, then the other party is notified of the terminal change, but user privacy and mobility are compromised
Solution Approach 1:
The patent extracts the notification function from the call transfer process. When a call is extended from a first terminal to a second terminal, the system deliberately omits transmitting terminal change indications to the other party, thereby protecting user privacy while maintaining call continuity
Solution Approach 2:
The private branch exchange acts as an intermediary that manages the call extension between terminals. It affirms the relationship between terminals and handles the call transfer without revealing the actual terminal changes to the other party, enabling seamless transitions
2Loss of information
If a system provides full notification of call status changes, then transparency is improved, but user mobility and privacy are reduced
Solution Approach 1:
The system segments information transmission by distinguishing between internal system knowledge (terminal affiliations and call extensions) and external information shared with parties. The private branch exchange maintains complete terminal status information internally while selectively withholding terminal change notifications from the other party
Solution Approach 2:
Instead of notifying the other party of terminal changes as is conventional, the system inverts this approach by deliberately not providing such notifications. This inversion protects user privacy and maintains mobility while still ensuring call continuity through the affiliation mechanism
3Ease of operation
If a telecommunications system enables seamless call extension between terminals, then user mobility is enhanced, but system complexity increases
Solution Approach 1:
The private branch exchange performs multiple functions: it manages terminal affiliations, extends calls between terminals, and controls information flow. This multi-functionality consolidates complexity into a single system component rather than requiring complex coordination between multiple independent systems
Solution Approach 2:
The system performs preliminary action by establishing terminal affiliations in advance through the private branch exchange. This pre-configuration enables seamless call extensions without requiring complex real-time negotiations or protocols when a transfer occurs
Data Source
AI summary
A method is disclosed that enables a user of one telecommunications terminal that is engaged in a call to move or “extend” the call to a second telecommunications terminal without notifying any other party on the call of the move. This is particularly useful in many situations. For example, the user might be at work and engaged in a call with a client on the user's wireline desk telephone. If the user needs to leave the office, the user can extend the call to his or her cell phone, while the call is in progress, without notifying the client. This enables the user to leave the office and continue the call on his or her cell phone without having the client ever know that the user is on his or her cell phone and not in the office.