Dynamic Address Routing for Call Obfuscation

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Solution Overview

Problem

Companies face high long-distance toll charges when calls are routed through the Public Switched Telephone Network (PSTN) to external users, and there is a need for a solution to avoid these charges by modifying call routing mechanisms.

Innovation Solution

A communication system modifies call requests by replacing or augmenting the source address with a dynamic address and adding a key associated with the source address, allowing calls to be routed as local, thereby avoiding long-distance tolls, and enables users to obfuscate their source address if desired.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If calls are routed through the Public Switched Telephone Network (PSTN) to external users, then calls can be made to users outside the enterprise network, but long-distance toll charges are incurred

Engineering Contradiction:

Improvecall routing capabilityVSAvoidcommunication cost

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent introduces a key as an intermediary element that enables indirect routing. Instead of directly routing external calls through PSTN, the system uses a key associated with the external user to route calls through the enterprise network infrastructure, thereby avoiding PSTN long-distance charges while maintaining the ability to reach external users

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of energy

If the source address is modified with a dynamic address, then toll charges are avoided and address obfuscation is achieved, but the call routing system becomes more complex

Engineering Contradiction:

Improvecommunication costVSAvoidcall routing system complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-associating keys with external user destinations and pre-configuring the routing system to recognize and process these keys. This preparation allows the system to automatically route calls through the enterprise network without requiring complex real-time decisions, thereby reducing operational complexity despite the modified routing logic

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the routing parameter from using original source/destination addresses to using dynamic addresses combined with associated keys. This parameter transformation simplifies the routing decision process by creating a standardized key-based lookup mechanism, reducing the complexity of handling diverse routing scenarios

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9628298B2Routing technique

Publication Date: 2017.04.18 AVAYA INC

AI summary

A first communication device sends a call request to a second communication device. The call request comprises a source address associated with the first device and a destination address associated with the second communication device. A communication system modifies the call request by replacing or augmenting the source address with a dynamic address and adding a key associated with the source address. The modified request is sent to the second device.If a user at the second device wants to make a return call, a call request is sent using the dynamic address as the destination address along with the key. The call request is routed to the first communication address by determining the source address of the first communication device from the key.