IP Telephony LAN Routing for Intra-Office Calls
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Solution Overview
Problem
IP-based private branch exchange systems require constant Internet connectivity for all calls, including intra-office communications, even when employees are connected to the same local area network, leading to unnecessary bandwidth consumption and potential disruptions if Internet access is lost.
Innovation Solution
Implementing a method where IP telephony devices within the same business or account share and store local address information, allowing direct communication over the local area network without routing through the IP-based PBX service provider, thereby reducing reliance on Internet connectivity for internal calls and optimizing bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If IP telephony devices route all calls through the IP-based PBX service provider via the Internet, then call management and routing control are improved, but bandwidth consumption increases and system reliability decreases when Internet access is lost
Solution Approach 1:
The patent segments call routing into two paths: local area network routing for intra-office calls and Internet routing for external calls. IP telephony devices connected to the same LAN can communicate directly without traversing the Internet, while maintaining centralized management through the PBX service provider for external communications.
Solution Approach 2:
The system performs preliminary registration of IP telephony devices with the PBX service provider, storing device identification information in advance. This allows the system to determine routing paths beforehand - local devices are identified during registration, enabling direct LAN routing without requiring Internet connectivity during actual calls.
2Ease of operation
If IP telephony devices route all calls through the IP-based PBX service provider via the Internet, then centralized call management is improved, but system reliability deteriorates when Internet access is lost
Solution Approach 1:
The patent creates a segmented routing architecture where call paths are divided based on destination: local LAN calls use direct peer-to-peer routing within the network, while external calls use the Internet and PBX service provider. This segmentation ensures that loss of Internet connectivity does not affect local call continuity.
Solution Approach 2:
The PBX service provider acts as an intermediary only for external calls, not for local communications. The service provider maintains registration information and routes external calls, while local calls bypass the intermediary and communicate directly, ensuring reliability even when the intermediary becomes unavailable.
3Ease of operation
If IP telephony devices are hardwired to a central PBX switching unit, then call management control is improved, but system flexibility and scalability worsen
Solution Approach 1:
The patent extracts the physical switching unit from the system architecture, replacing it with software-based IP telephony devices that communicate over standard network infrastructure. This removes the constraint of fixed physical connections while maintaining logical call management control through the PBX service provider.
Solution Approach 2:
IP telephony devices can function both as endpoints for external calls managed by the PBX service provider and as direct communication nodes for local calls. This multi-functionality allows the system to adapt to different call scenarios without requiring additional hardware or reconfiguration.
Data Source
AI summary
When IP telephony devices that make use of an Internet protocol (IP) based private branch exchange (PBX) service provider resister with the PBX service provider, they furnish local area network address information that indicates how the telephony devices can be reached directly on the local area network to which they are connected. This information is provided to other telephony devices within the same business or organization. As a result, the telephony devices within a business or organization can contact one another directly to setup and conduct telephony communications over a local area network, without the need for such telephony communications to pass over a public data network, or though assets of the IP based PBX service provider.