IMS Network Node Patching Cellular and Enterprise Call Legs
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Solution Overview
Problem
Integration of VoIP enterprise networks with carrier cellular telephony networks is hindered by issues such as delay, Quality of Service (QoS), and efficiency, preventing cost-effective provision of acceptable quality voice services, and there is a need for enterprises to control and monitor calls made by employees, especially in the context of IP Multimedia Subsystem (IMS) networks.
Innovation Solution
A system and method that integrates an outgoing cellular call as an enterprise call within an IMS environment by receiving a SIP INVITE request, establishing two call legs, and patching them to present the enterprise address instead of the cellular address to the called party, using a Unified Communications Platform (UCP) and IMS network nodes to manage call legs and ensure end-to-end communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cellular networks use conventional circuit-switched technology for telephony calls, then call reliability is maintained, but network efficiency and QoS are degraded
Solution Approach 1:
The patent introduces an IMS network as an intermediary layer between the cellular network and enterprise networks. The IMS network handles call routing and signaling using SIP protocols, while the cellular network focuses on reliable voice transmission using circuit-switched technology. This mediator approach allows the cellular network to maintain reliability without bearing the burden of complex QoS management and routing decisions, thereby improving overall network efficiency.
2Adaptability or versatility
If enterprises implement VoIP-based telephony systems, then network adaptability and integration capability are improved, but call quality and QoS are degraded
Solution Approach 1:
The patent segments the telephony system into distinct functional layers: the enterprise VoIP network handles adaptability, routing, and integration functions, while the cellular circuit-switched network handles the actual voice transmission with guaranteed QoS. This segmentation allows each layer to optimize for its specific function - VoIP for flexibility and integration, circuit-switched for reliable voice delivery - thereby resolving the contradiction between adaptability and call quality.
3Ease of operation
If enterprises monitor and control employee calls, then call management control is improved, but system complexity increases
Solution Approach 1:
The patent enables enterprises to self-configure call monitoring and control policies through the IMS framework. The enterprise can define calling policies, monitoring requirements, and integration parameters within the IMS environment without requiring complex custom development. The IMS network automatically applies these policies to incoming and outgoing calls, thereby providing ease of operation while minimizing the complexity burden on the enterprise.
Data Source
AI summary
In one embodiment, an IMS network node is operable, responsive to receiving a SIP INVITE request from an enterprise user to initiate origination of an outgoing cellular call to a called party, for establishing a first call leg to the enterprise user by sending a SIP INVITE message back to the enterprise user. The IMS network node includes functionality for establishing a second call leg to the called party. The first and second call legs are patched to establish an end-to-end communications path between the enterprise user and the called party, wherein an enterprise address instead of a non-enterprise address of the enterprise user is presented to the called party as a calling line identity with respect to the outgoing cellular call from the enterprise user.