Call Transfer Server Mediating Multi-USIM Subscription Routing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for configuring call transfer between multiple Universal Subscriber Identity Modules (USIMs) in communication devices are cumbersome, making it difficult for users to receive calls and make calls using alternate USIMs, especially when switching between network operators.
Innovation Solution
A mechanism that allows a telephone to select and store subscription information, search for alternate USIMs, obtain phone numbers, and send call transfer requests to a call transfer server to reroute calls between selected and non-selected USIMs, enabling seamless call transfer and usage of alternate USIMs as caller IDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a user provisions multiple USIMs in a mobile phone to maintain subscriptions to multiple network operators, then the user can access different network operators, but the user cannot receive calls or make calls using the non-selected USIM
Solution Approach 1:
The patent introduces a call transfer server as an intermediary between the network operator and the mobile phone. When a call is received for a non-selected USIM, the call transfer server automatically transfers the call to the currently selected USIM, enabling the user to receive calls from multiple operators without manual configuration. This mediator resolves the contradiction by enabling multi-operator call reception while maintaining single-USIM active status.
Solution Approach 2:
The patent implements preliminary configuration of call transfer services during USIM provisioning. The system pre-configures call transfer rules and parameters when multiple USIMs are provisioned, so that when a user switches between USIMs, the call transfer functionality is already in place and requires no additional user action. This preliminary setup enables seamless call reception across multiple operators.
2Ease of operation
If a user manually configures call transfer service to receive calls on alternate USIMs, then calls can be transferred between USIMs, but the configuration process is cumbersome and complex
Solution Approach 1:
The patent implements self-service call transfer configuration through the call transfer server. Instead of requiring users to manually configure complex call transfer parameters, the system automatically detects the provisioned USIMs, establishes call transfer rules, and manages the transfer logic. The server autonomously handles call routing decisions based on which USIM is currently selected, eliminating the need for user intervention in the configuration process while maintaining full call transfer functionality.
Solution Approach 2:
The call transfer server is designed with universal functionality that automatically adapts to any combination of provisioned USIMs. Rather than requiring separate configuration for each USIM pair, the server provides a general-purpose call transfer mechanism that works with any number of USIMs and automatically adjusts to the current active USIM. This multi-functional design simplifies the configuration process by making it unnecessary to manually set up individual call transfer rules for each USIM combination.
3Adaptability or versatility
If a user wants to make a phone call using the phone number of a non-selected USIM, then the user can maintain multiple subscriptions, but the user cannot use the non-selected USIM as a caller phone number
Solution Approach 1:
The call transfer server acts as a mediator that enables the use of non-selected USIM phone numbers as caller IDs. When a user initiates a call, the server intercepts the request and uses the non-selected USIM's phone number as the caller ID, then transfers the call through the selected USIM's network connection. This intermediary mechanism allows the user to make calls using any provisioned USIM's phone number while maintaining the technical requirement of having only one active USIM for network attachment.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
There is provided a telephone that is capable of accessing a memory for storing subscription information that includes a phone number. The telephone comprises, among other things: a searching unit that searches the memory for second subscription information that is different from the first subscription information selected by the selecting unit; an obtaining unit that obtains a first phone number included in the first subscription information and transfer source information that enables a call transfer server of a network operator associated with the second subscription information to identify a second phone number included in the second subscription information; and a sending unit that sends, to the call transfer server, a call transfer request for requesting the network operator to transfer a call addressed to a phone number, which is identified by the call transfer server based on the transfer source information, to the first phone number.