SIP Notify Message for Accurate VoIP Fax Tracking

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Solution Overview

Problem

Current VOIP voice service systems fail to accurately signal facsimile pass-through mode, leading to incorrect call status and billing issues, as they do not effectively notify service providers of fax tone detection between Optical Network Terminals (ONTs).

Innovation Solution

A method is introduced to signal facsimile pass-through mode by establishing a VOIP call, detecting the facsimile tone, and sending a SIP-based notify message to inform the service provider, ensuring accurate tracking and billing through a SIP-based event notification mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If standard VOIP signaling is used for facsimile calls, then call establishment is simple, but call status tracking is inaccurate

Engineering Contradiction:

Improvecall establishmentVSAvoidcall status tracking

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent introduces a SIP NOTIFY message as an intermediary signaling mechanism between the ONT and service provider. This notify message carries facsimile detection information that standard VOIP signaling cannot convey, enabling accurate call status tracking while maintaining simple call establishment through existing VOIP protocols.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If facsimile detection is implemented without additional signaling, then system complexity is reduced, but billing accuracy deteriorates

Engineering Contradiction:

Improvesystem complexityVSAvoidbilling accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent implements a feedback mechanism where the ONT detects facsimile tones during calls and sends SIP NOTIFY messages to the service provider. This feedback loop provides real-time information about call nature (voice vs. facsimile), enabling accurate billing while adding minimal complexity through a standardized signaling extension.

Inventive Principle:

Principle #23Feedback

3Reliability

If T.38 codec negotiation is required for fax detection notification, then fax capability is confirmed, but call setup time increases

Engineering Contradiction:

Improvefax capability confirmationVSAvoidcall setup time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent performs facsimile detection during the ongoing call using voice activity detection algorithms rather than requiring preliminary T.38 codec negotiation. The SIP NOTIFY message is sent based on detected fax tones during the call, confirming fax capability without extending call setup time, as detection occurs parallel to normal call progression.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9143632B2Method for signaling a facsimile pass through mode over a VOIP voice service

Publication Date: 2015.09.22 ARRIS ENTERPRISES LLC

AI summary

A method (250) for signaling a facsimile pass through mode over a voice over internet protocol voice service is disclosed. The method (250) includes: establishing (260) a voice over internet protocol call; detecting (270) that a facsimile tone has been received by a sender; and sending (280) a facsimile pass through notify message, from the sender, in response to detecting that the facsimile tone has been received. Advantageously, the method 250 can be adapted to inform the voice over internet protocol service provider about the details of an ongoing facsimile call in pass through mode. Advantageously, this can provide usage information, quality of transmission information, billing information and other useful information.