Voice Gateway TTY Tone Detection and Visual Alerting
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Solution Overview
Problem
In integrated voice and text communication systems, there is a lack of indication to users of IP voice devices when a remote party connected to the Public Switched Telephone Network (PSTN) is not capable of sending or receiving text, leading to unwanted audio tones being generated and played to PSTN users.
Innovation Solution
A method and system that detects the presence of a PSTN textphone in a call path and provides visual clues to the end user, preventing the generation of unwanted TTY/TDD tones by using in-band signaling, call control signaling, or media stream indicators to determine the remote device's text capability and alert the user through dialog boxes or warning messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If text messaging capability is integrated into IP voice devices, then communication versatility is improved, but unwanted audio tones are generated when the remote party is on PSTN and cannot receive text
Solution Approach 1:
The system performs preliminary detection of PSTN textphone presence in the call path before text messaging occurs. By using in-band signaling, call control signaling, or media stream indicators to detect the remote device's text capability in advance, the system can alert the user through dialog boxes or warning messages before text is transmitted, preventing unwanted tone generation
Solution Approach 2:
The system implements feedback mechanisms by providing visual clues to the end user about the remote party's text capability. The gateway or IP voice device monitors call path information and feeds back status indicators (such as dialog boxes or warning messages) to alert users whether the remote party can receive text, enabling users to make informed decisions about text transmission
2Object-generated harmful factors
If visual clues are provided to alert users about PSTN connection, then unwanted tone generation is prevented, but system complexity increases due to detection and signaling mechanisms
Solution Approach 1:
The patent employs intermediaries in the form of gateways and signaling protocols that mediate between the IP voice device and the PSTN network. These intermediaries detect PSTN textphone presence and convey capability information back to the IP device through standardized signaling mechanisms, distributing the detection complexity across network infrastructure rather than concentrating it in end devices
Solution Approach 2:
The system uses multi-functional signaling mechanisms that serve multiple purposes: in-band signaling not only detects textphone presence but also carries capability information; call control signaling simultaneously manages call setup and provides text capability indicators. This multi-functionality reduces the need for separate dedicated detection systems
Data Source
AI summary
A method to prevent TTY/TDD (teletypewriter/telecommunications device for the deal) probing and unwanted TTY/TDD tone generation on voice gateways comprises detecting a PSTN textphone in a call path, if any; and providing visual clues to an end user, thereby avoiding generation of unwanted text by the end user. The visual clues may be in the form of a dialog box on a computer, warning messages on a phone, and/or the like.