IMS Tel URI Conversion Module for Call Routing
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Solution Overview
Problem
Current IMS networks face issues where the target telephone number is lost during call routing and require duplicate storage of tel URIs and SIP URIs, leading to administrative burdens and memory waste.
Innovation Solution
A conversion module within the IMS terminating network converts SIP URIs with embedded telephone numbers into equivalent tel URIs, allowing the I-CSCF and S-CSCF to route calls using tel URIs, thereby eliminating the need for duplicate storage and enabling the retrieval of original dialed numbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SIP URIs with embedded telephone numbers are used for call routing in IMS networks, then call routing between different network operators is enabled, but the target telephone number is lost during routing and duplicate storage of tel URIs and SIP URIs is required
Solution Approach 1:
The patent introduces a URI Translation Module (UTM) as an intermediary component that translates SIP URIs with embedded telephone numbers into tel URIs during the call routing process. This translation mechanism preserves the original telephone number information by converting it into a standardized tel URI format that can be properly routed while maintaining the numeric identifier throughout the process.
Solution Approach 2:
The patent changes the parameter format of the URI from SIP URI with embedded telephone number to tel URI. This parameter transformation allows the system to maintain the telephone number in a recognizable and routable format throughout the call establishment process, enabling both inter-operator routing and preservation of the target number.
2Adaptability or versatility
If both tel URIs and SIP URIs are stored in the Home Subscriber Server and Subscription Locator Function, then call routing flexibility is maintained, but administrative burden increases and memory space is wasted
Solution Approach 1:
The patent extracts the telephone number information from the SIP URI format and stores it separately in the HSS and SLF databases in tel URI format. This extraction eliminates the need to store duplicate SIP URI representations while preserving the essential routing information, thereby reducing storage requirements while maintaining routing flexibility.
Solution Approach 2:
The patent implements a universal tel URI storage mechanism that serves multiple functions: it enables both domestic and international call routing, supports inter-operator communication, and provides a standardized format for all URI translations. This single storage approach replaces the need for separate tel URI and SIP URI storage, reducing redundancy while maintaining full routing capability.
Data Source
AI summary
The present invention proposes a specific handling of tel URIs in an IMS terminating network so as to enable routing of calls using telephone numbers (and not SIP URIs with embedded telephone numbers) as identifiers of the target users of those calls. Specifically, the present invention introduces a conversion module which is located within the IMS terminating network and is capable of converting SIP URIs with embedded telephone numbers into equivalent tel URIs which are then used by a terminating I-CSCF and S-CSCF to query the SLF and/or HSS so that they can route the calls to the target users.