Wildcarded PUI in IMS Implicit Registration Set
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Solution Overview
Problem
Existing solutions for providing IP Multimedia Subsystem services to users within corporate networks without individual subscriptions are inefficient, often requiring multiple CSCF traversals and losing original SIP header information.
Innovation Solution
Incorporating a wildcarded Public User Identity or sub-domain within the Implicit Registration Set to enable direct dialing and service access without additional CSCF traversals, while preserving SIP header information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing solutions are used to provide IMS services to users within corporate networks without individual subscriptions, then service access is enabled, but multiple CSCF traversals are required and original SIP header information is lost
Solution Approach 1:
The patent applies preliminary action by pre-configuring the Implicit Registration Set with wildcarded Public User Identities before the actual service interaction. This allows the system to prepare the necessary routing information in advance, so that when a user terminal needs access, the SIP messages can be directly routed without requiring multiple CSCF traversals. The wildcarded PUIs are set up beforehand to match any user terminal in the corporate network, enabling direct dialing while preserving SIP headers.
2Ease of operation
If existing solutions are used to provide IMS services to users within corporate networks without individual subscriptions, then service access is enabled, but original SIP header information is lost
Solution Approach 1:
The patent uses the Implicit Registration Set with wildcarded Public User Identities as an intermediary mechanism. Instead of having SIP messages pass through multiple CSCFs where headers might be modified or lost, the wildcarded PUIs act as a mediator that enables direct routing. The Implicit Registration Set preserves the original SIP header information by maintaining the complete message structure throughout the routing process, allowing the corporate network users to access IMS services without losing critical header data.
3Productivity
If wildcarded Public User Identity is included in Implicit Registration Set, then direct dialing is enabled without additional CSCF traversals, but the system must handle wildcard matching complexity
Solution Approach 1:
The patent applies parameter changes by modifying the Public User Identity parameter to include wildcard characters. This allows the system to represent multiple possible user identities with a single entry in the Implicit Registration Set. The wildcarded PUI parameter enables the system to match any user terminal in the corporate network without requiring individual subscriptions. This parameter modification simplifies the routing process and eliminates the need for multiple CSCF traversals while improving dialing efficiency.
Data Source
AI summary
A method of facilitating access to services of an IP Multimedia Subsystem network by services located behind an access point to said network. The access point is associated with a subscription to the IP Multimedia Subsystem network. The method comprises including within an Implicit Registration Set defined for said subscription, a wildcarded Public Service Identity or Public Service Identity sub-domain representative of a range of Public Service Identities. At IP Multimedia Subsystem registration of said access point with the IP Multimedia Subsystem network, the Public Service Identities contained in the Implicit Registration Set are distributed to a Serving Call Session Control Function allocated to said access point and to a Proxy Call Session Control Function to which said access point is attached.