Push-to-Talk User Agent for PSTN Gateway Integration
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Solution Overview
Problem
Existing push-to-talk services require specialized terminal devices and are limited to digital packet networks like GSM or UMTS, making it difficult to integrate with analog or digital telephone networks for simple and cost-effective group communication.
Innovation Solution
A method that uses a push-to-talk user agent connected to an available push-to-talk server and messaging service, enabling communication through standard telephones with automatic direction switching in the transmission channel, supporting dual-tone multi-frequency (DTMF) and voice recognition for interface operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If specialized terminal devices are used for push-to-talk service in GSM or UMTS networks, then push-to-talk functionality is achieved, but device complexity and cost increase
Solution Approach 1:
The patent introduces a gateway device as an intermediary between the PSTN/ISDN network and the push-to-talk server. This gateway handles the complex protocol conversion and signaling functions, allowing standard telephones without specialized hardware to access push-to-talk services. The gateway acts as a mediator that translates between traditional telephone protocols and packet-switched push-to-talk protocols.
Solution Approach 2:
The invention enables standard telephones with multi-functionality to access push-to-talk services alongside their traditional voice and data capabilities. The gateway device provides universal access by supporting both circuit-switched PSTN/ISDN connections and packet-switched push-to-talk communication, making the service accessible to existing telephone infrastructure without requiring specialized terminal devices.
2Ease of operation
If push-to-talk service is implemented in analog or digital telephone networks, then accessibility to standard telephones is improved, but integration complexity with existing networks increases
Solution Approach 1:
The gateway serves as an intermediary network element that simplifies integration by handling all complex protocol conversions and signaling functions. It interfaces with both the traditional PSTN/ISDN network and the packet-switched push-to-talk infrastructure, absorbing the integration complexity within itself while presenting simple interfaces to both networks.
Solution Approach 2:
The system architecture segments the push-to-talk functionality into separate network components: the gateway handles protocol conversion and signaling, the push-to-talk server manages communication logic, and standard telephones provide user access. This segmentation allows each component to be optimized independently and simplifies overall network integration.
3Productivity
If automatic direction switching is implemented in transmission channels, then semi-duplex communication is achieved, but control complexity increases
Solution Approach 1:
The automatic direction switching mechanism operates autonomously based on predefined protocols and signaling messages. The gateway and push-to-talk server automatically manage transmission direction switching without requiring complex manual control interfaces, making the system self-managing for the semi-duplex communication control functions.
Solution Approach 2:
The system implements feedback mechanisms through signaling messages exchanged between the gateway, push-to-talk server, and terminal devices. These feedback loops enable automatic direction switching by monitoring communication state and adjusting transmission directions based on received signaling information, reducing the need for complex open-loop control.
Data Source
Figure 1
AI summary
The invention relates to a method fro carrying out a Push-to-Talk communication in a digital and/or analogue telephone network, the device being designed as interface for a semi-duplex communication between a Push-to-Talk server and the analogue or digital telephone network and the analogue or digital network serves as interface with the operating means. The invention is characterised in that the interface uses a communication node or group system as computer and carries out a communication in a transmission channel with automatic directional switching in an analogue or digital telephone network in the direction of an available Push-to-Talk server, the analogue or digital telephone network being designed as an audio and control interface in the direction of the operating means.