VoIP Endpoint Talk Path Actuator for TTY Text Transmission
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Solution Overview
Problem
In Voice over Internet Protocol (VoIP) networks, text transmissions from TTY devices are not reliably handled due to the lack of self-identifying handshake tones, leading to incorrect call set-up negotiations between IP endpoints and analog gateways, resulting in distorted audio and inability to transmit text packets.
Innovation Solution
A communications system where multiple endpoints share a virtual address but connect to separate ports, with an actuator to enable and disable transmission paths, allowing only one endpoint to transmit at a time, and using protocols like RFC-2833 for non-audio text packet transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple endpoints share a virtual address to simplify processing, then ease of operation is improved, but communication reliability deteriorates when TTY devices are involved due to inability to reliably transmit text packets
Solution Approach 1:
The system segments the communication path by separating TTY endpoints from voice endpoints into distinct groups, each with dedicated handling mechanisms. The TTY endpoints are identified as a separate group sharing a virtual address, allowing specialized text transmission handling while maintaining simplified processing through the shared address mechanism.
Solution Approach 2:
The system introduces an intermediary mechanism that detects when a TTY endpoint is involved in a communication and activates specialized text transmission protocols (RFC-2833) only for those specific paths. This intermediary layer ensures reliable text packet transmission without requiring all endpoints to implement complex text handling capabilities.
2Ease of operation
If TTY devices use standard telephone call signaling, then ease of operation is improved, but communication reliability deteriorates due to distorted audio and inability to transmit text packets
Solution Approach 1:
The system applies local quality by providing TTY-specific text transmission protocols (RFC-2833) only for communication paths involving TTY endpoints, while voice endpoints continue using standard audio signaling. This localized approach ensures reliable text packet transmission for TTY users without affecting the simplicity of voice-to-voice communications.
3Ease of operation
If voice-optimized audio channels are used for TTY text transmission, then ease of operation is improved, but communication reliability deteriorates due to unreliable transmission of audio tones
Solution Approach 1:
The system replaces the mechanical/audio-based TTY transmission method with a data packet-based approach using RFC-2833 protocol. Instead of relying on audio tones to be transmitted through voice-optimized channels, the system encodes text as specialized data packets that are reliably transmitted through the VoIP network's data infrastructure.
Data Source
AI summary
In a communications system where a plurality of endpoints share a virtual address, all of the endpoints are involved in a communication with one of them, but only one has its talk path enabled at any one time. Each endpoint has an actuator that, when actuated, enables that endpoint's talk path and disables the other endpoints' talk paths. Preferably, one of the endpoints is either an announcement facility or a teletypewriter, while another one of the endpoints is a telephone.