IMS Phone-Context Routing for Roaming TEL URI Handling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current IP Multimedia Subsystem (IMS) systems lack clear handling mechanisms for routing SIP messages containing TEL URIs, particularly when users roam and need to specify whether a local telephone number is valid within the visited or home network, leading to inflexibility in message routing.
Innovation Solution
The method involves specifying a phone-context within a TEL URI at the IMS/SIP client to identify whether a telephone number is local to the visited or home network, allowing users to select the valid network, and routing the message accordingly, with preconfigured settings and user interface options for selecting the appropriate phone-context.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the IMS system uses standard SIP routing without phone-context specification, then routing is simple and direct, but it cannot handle local numbers correctly when users roam between networks
Solution Approach 1:
The patent segments the TEL URI into distinct components: the telephone number and the phone-context. This segmentation allows the system to separately handle the number itself and its contextual validity information, enabling flexible routing decisions without overwhelming complexity. The phone-context acts as an independent segment that carries network validity information.
Solution Approach 2:
The patent introduces the phone-context as an intermediary element between the TEL URI and the routing decision. This intermediary carries the phone-number-validity information that mediates between the user's local number and the network's routing requirements, enabling the system to resolve the contradiction between simplicity and adaptability.
2Adaptability or versatility
If the system allows users to specify phone-context for local numbers, then message routing becomes flexible during roaming, but the handling mechanism becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-configuring phone-context information in the user terminal before roaming scenarios occur. The terminal is pre-equipped with the ability to specify phone-context for local numbers, so when roaming happens, the routing flexibility is immediately available without requiring complex real-time processing or additional handling mechanisms.
3Measurement precision
If the IMS system requires clear handling mechanisms for TEL URI routing, then routing accuracy improves, but the system becomes less flexible for roaming users
Solution Approach 1:
The patent applies local quality by making the phone-context specification local to each user terminal and each TEL URI. Instead of requiring a universal complex handling mechanism, each terminal can independently specify the phone-context for its own local numbers. This local approach achieves routing accuracy for each specific case while maintaining overall system flexibility for roaming users.
Data Source
AI summary
A system, method, and node for routing a SIP message within an IP Multimedia Subsystem (IMS) from an IMS/SIP client attached to a visited network to a destination address that contains a TEL URI including a local telephone number. The IMS/SIP client places a phone-context within the TEL URI, which specifies whether the local telephone number belongs to the visited network or to the client's home network. The message is delivered to the client's home network, which routes the message according to the phone-context contained within the TEL URI.