Dynamic Call Type Detection in Packet Switched Networks
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Solution Overview
Problem
In packet switched networks, signaling can be delayed due to stringent bandwidth constraints, leading to signal degradation and misidentification of modem or fax signals, particularly during the answer phase and training sequence, which affects VoIP and FoIP transmissions.
Innovation Solution
A system that dynamically detects partial characteristics of incoming signals and generates messages to identify these characteristics, allowing for incremental transmission and minimizing signal degradation by determining the type of call and sending event messages between network endpoints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If packet network endpoints wait to fully detect signal characteristics before transmission, then signal identification accuracy is improved, but signal delay increases
Solution Approach 1:
The system performs preliminary detection of signal characteristics and transmits partial information before the complete signal is fully detected. The gateway sends notification messages containing detected characteristics (such as tone frequencies, modulation types) as they are identified, rather than waiting for complete signal detection. This allows the receiving endpoint to prepare for incoming signal types in advance, reducing overall delay while maintaining identification accuracy.
2Loss of energy
If packet networks use lossy compressed codecs for voice transmission, then bandwidth consumption is reduced, but signal information is destroyed
Solution Approach 1:
The signal transmission is segmented into two distinct paths: control signals (modem training sequences, fax protocols, answer tones) are transmitted as discrete notification messages with their characteristics encoded, while voice communication uses compressed codecs. This segmentation allows critical signaling information to be preserved in uncompressed form while bandwidth-intensive voice data can be compressed, preventing information loss in the control path.
Solution Approach 2:
The gateway acts as an intermediary that detects signal characteristics and generates notification messages containing this information. These notification messages serve as a mediator between the transmitting and receiving endpoints, providing accurate signal type information without requiring the receiving endpoint to decode compressed voice data to identify signal characteristics.
3Adaptability or versatility
If modem control signals are transmitted through packet network endpoints, then communication between modems is enabled, but signal detection time increases
Solution Approach 1:
The system implements feedback by having the gateway detect signal characteristics and send notification messages back to the transmitting endpoint. The notification contains information about detected characteristics (frequencies, modulation types), allowing the transmitting modem to adjust its transmission parameters and the receiving endpoint to prepare appropriate processing, thereby reducing detection time while maintaining communication capability.
Data Source
AI summary
A method and system for dynamic call type detection for circuit and packet-switched networks. A network endpoint, such as a gateway, will receive an incoming signal and make an examination of the signal to detect characteristics of the signal. Upon detection of a characteristic of the signal, the gateway will generate a data packet, identifying the characteristic, and send the packet to a receiving network endpoint. The initial gateway will continue to examine the incoming signal and continue to send packets identifying characteristics of the signal as more characteristics are detected. The receiving gateway may then begin reproducing the signal in part by generating a signal that has the characteristics as indicated by the data packets. Once the initial gateway no longer receives the incoming signal, and determines that an event has occurred, the gateway will send a packet to the receiving gateway to inform it of the event.