VoIP Conference Bridge for Automatic Party Line Joining
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Solution Overview
Problem
Existing VoIP systems lack the ability to automatically join multiple parties into a conference call, similar to analog telephony systems, which is desirable in robust communication networks like railway systems, where cost-effective and efficient communication is crucial.
Innovation Solution
A VoIP unit with a VoIP control module that supports party call functionality, enabling point-to-point and multicast communication, registers with a SIP server to manage calls and mix audio streams, allowing automatic joining of VoIP units into a party call initiated by another unit or an operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional VoIP systems use point-to-point communication only, then network simplicity is maintained, but multi-party automatic joining capability is lost
Solution Approach 1:
The patent segments the multi-party call functionality by introducing a conference bridge component that separates the complexity of multi-party management from individual VoIP phones. The conference bridge handles stream mixing and participant coordination, while individual phones maintain simple point-to-point communication capabilities, thus adding versatility without significantly increasing end-device complexity.
Solution Approach 2:
The conference bridge acts as an intermediary component between individual VoIP participants and the network. It receives audio streams from multiple participants, mixes them, and redistributes to all participants, enabling automatic multi-party joining without requiring complex peer-to-peer coordination protocols among phones.
2Ease of operation
If analog telephony systems are used for party line function, then automatic joining is achieved, but cabling infrastructure cost increases
Solution Approach 1:
The patent replaces the mechanical parallel cabling system of analog telephony with an IP-based digital communication system. Instead of requiring separate physical lines for each telephone connection, the system uses VoIP over IP network infrastructure, where audio streams are digitally mixed and routed through the conference bridge, eliminating the need for extensive physical cabling while maintaining automatic joining functionality.
3Quantity of substance
If VoIP systems deploy multiple IP devices across network backbone, then cabling cost is reduced, but multi-party conference capability is unavailable
Solution Approach 1:
The conference bridge is designed as a universal component that can be integrated into existing IP network infrastructures. It provides multi-party conference capabilities across diverse VoIP devices and network configurations, making the conference functionality adaptable to various deployment scenarios without requiring specialized hardware or complex reconfiguration of the underlying network cabling.
Data Source
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AI summary
Devices, systems and methods are provided to support a party call with auto-joining function in a communication system for a distributed transport system that employs VoIP technology. A VoIP unit or end point acts as a conference bridge between an operator extension and other end points. A first end point makes a SIP call to the operator and multicasts a mix of its send audio and the received operator audio. Other end points first check for multicast traffic being received before making a SIP call to the operator and, if so, play out the received audio over its speaker and multicast its send audio. The end point initiating the call mixes this subsequent stream into a stream to the operator, effectively acting as the conference bridge to the operator. The other end points are responsible for mixing received multicast streams for their local speaker.