Unified Directory Number for Dual Mode Call Redirection
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Solution Overview
Problem
Existing call redirection and handoff solutions in dual mode devices anchoring enterprise-hosted calls, complicating Caller ID services by requiring two directory numbers and complicating network operations.
Innovation Solution
An interworking protocol using SIP, H.323, and SS7 protocols to redirect calls to dual mode devices operating in both packet-switched and circuit-switched networks, utilizing a single dialable address and a limited enterprise-based IMS platform for seamless Caller ID and VoIP services, with E.164 numbers hosted in the enterprise for unified billing and routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing call redirection solutions use two directory numbers to anchor enterprise-hosted calls, then call routing between networks is enabled, but Caller ID services are complicated and a single caller identifier cannot be provided
Solution Approach 1:
The patent merges the two separate directory numbers (enterprise number and mobile number) into a single unified directory number that can be used for both enterprise and mobile networks. This unification allows the system to maintain call routing capability while providing a single caller identifier to Caller ID systems, thereby resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The unified directory number serves multiple functions: it acts as both the enterprise contact number and the mobile contact number, enabling calls to be routed to dual-mode devices regardless of which network they are operating on. This multi-functionality eliminates the need for separate numbers while maintaining network adaptability.
2Ease of operation
If dual mode devices use separate directory numbers for enterprise and mobile networks, then network-specific routing is achieved, but a single caller identifier cannot be provided to Caller ID systems
Solution Approach 1:
The patent combines the enterprise directory number and mobile directory number into a single unified directory number. This unified number is used for routing calls to dual-mode devices on either enterprise or mobile networks, while also being the single identifier presented to Caller ID systems, thus preventing loss of caller identifier information.
Solution Approach 2:
The unified directory number acts as an intermediary that bridges the enterprise network and mobile network. It enables network-specific routing while maintaining a consistent caller identifier, serving as a mediator between the two networks and the Caller ID system.
3Extent of automation
If existing solutions anchor calls in the enterprise using proxy engines, then call control is achieved, but the system relies on external control and complicates network operations
Solution Approach 1:
The patent extracts the call control functionality from the enterprise proxy engine and relocates it to the dual-mode device itself. This extraction eliminates the need for complex enterprise-side call forwarding protocols and external control mechanisms, thereby reducing network operation complexity while maintaining automation.
Solution Approach 2:
The dual-mode device performs self-service call control by autonomously determining whether to route incoming calls to the enterprise network or mobile network based on its current operational state. This self-service capability eliminates the need for external proxy engines and simplifies network operations.
Data Source
AI summary
Systems and methods provide a single E.164 number for voice and data call redirection and telephony services such as caller identification, regardless of in which type of network a dual mode mobile device operates. When the dual mode device registers and is active in a GSM network, temporary routing and status updates are triggered and resultant information is maintained in both networks. A mobile terminated call is routed through an enterprise WLAN with call control within the enterprise being handled by SIP or H.323 signaling, and the call is redirected to the mobile device in the GSM network, where call control is assumed by the SS7 network. Services are provided using the protocols native to the active network, and the single E.164 is used consistently along with or lieu of the temporary routing information for subscriber identity specific functions, such as caller identification and voice mail.