Inter-network Connection Control for SIP Forking
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Solution Overview
Problem
In SIP networks, communication networks that do not support forking, such as non-IMS networks, face challenges in properly executing forking operations when interconnected with networks that do support forking, leading to erroneous connections and failure in establishing early dialogs.
Innovation Solution
An inter-network connection control device with a request signal forwarding unit and a response signal processor is employed to forward connection request signals from originating user equipment to other networks and select and forward appropriate response signals from multiple terminating user devices to the originating user equipment, ensuring proper forking operations across networks with and without forking support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a communication network that does not support forking (e.g., non-IMS network) is interconnected with a network that supports forking, then network interoperability is improved, but forking operations cannot be properly executed leading to erroneous connections
Solution Approach 1:
The patent introduces an inter-network connection control device as an intermediary between networks with different forking capabilities. This device receives connection request signals from networks without forking support, performs forking operations to transmit signals to multiple terminating devices, and manages the corresponding response signals. The intermediary enables network interoperability while ensuring reliable forking operations by centralizing the forking functionality in a dedicated control device that bridges the capability gap between different network types.
2Adaptability or versatility
If forking is executed in a network without native forking capabilities, then connection flexibility is improved, but device complexity increases due to the need for additional control functions
Solution Approach 1:
The patent extracts the forking functionality from the general network infrastructure and concentrates it in a dedicated inter-network connection control device. This separation allows networks without native forking capabilities to maintain their simple structure while still enabling forking operations through the specialized control device. The forking function is taken out as a distinct component that can be added to networks without requiring complex modifications to the existing network architecture.
3Adaptability or versatility
If multiple response signals are transmitted to the originating user equipment in a forking scenario, then service coverage is improved, but information management complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the inter-network connection control device monitors and manages the transmission of multiple response signals to the originating user equipment. The device tracks which response signals have been transmitted, manages the timing and sequencing of responses, and ensures proper information flow between the forking service device and the originating network. This feedback management prevents information loss and maintains clear signal correspondence despite the complexity of multiple parallel communication paths.
Data Source
AI summary
An inter-network connection control device that is used for interconnecting a communication network and another communication network includes a request signal forwarding unit that forwards a connection request signal transmitted from originating user equipment in the communication network to the other communication network, and a response signal processor that receives, from the other communication network, a plurality of response signals with respect to the connection request signal, the plurality of response signals being forked in the other communication network receiving the connection request signal and being forwarded to a plurality of terminating user devices, and that forwards one response signal of the plurality of response signals to the originating user equipment.