SIP Open-Line Call Identification via Header Tags

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Solution Overview

Problem

Victims of external threats, such as domestic abuse, face challenges when attempting to place open-line calls to seek assistance without the aggressor's knowledge. Existing systems often fail to recognize these calls as open-line, leading to potentially dangerous interactions between the victim and the operator.

Innovation Solution

A system and method are introduced to automatically identify open-line calls within a wireless telecommunication network. This is achieved by utilizing an additional identity tag or a URL within the SIP call, which indicates to the network that the call is an open-line call. The system then notifies the operator to maintain silence and dispatches assistance to the victim's location.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the operator receives a call and engages audibly with the victim, then the operator can provide assistance and guidance, but the aggressor may hear the conversation and worsen the dangerous situation

Engineering Contradiction:

Improvesafety of the victimVSAvoidthreat from aggressor

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an intermediary mechanism (additional identity tag or URL in SIP call) that mediates between the victim and the operator. This intermediary allows the operator to identify the call as open-line without the victim needing to explicitly state their situation, enabling safe communication while preventing the aggressor from hearing the conversation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system implements feedback by automatically detecting the open-line call status through the additional identity tag or URL in the SIP call headers, and then adjusting the operator's behavior accordingly. The operator receives feedback about the call type and responds by maintaining silence or providing appropriate assistance without audible engagement that could be heard by the aggressor.

Inventive Principle:

Principle #23Feedback

2Reliability

If the system automatically identifies open-line calls using additional identity tags or URLs in SIP calls, then the operator can be notified appropriately, but the system complexity increases

Engineering Contradiction:

Improveaccurate identification of open-line callsVSAvoidcall setup phase complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies universality by integrating the open-line call identification mechanism into the existing SIP call framework. The additional identity tag or URL can be incorporated into standard SIP call setup procedures, allowing the same system to handle both regular calls and open-line calls without requiring separate, complex identification systems.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system performs preliminary action by including the additional identity tag or URL in the SIP call headers during the call setup phase. This preliminary identification allows the operator to be pre-notified about the open-line call status before the actual conversation begins, avoiding the need for complex real-time detection during the call.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the operator maintains silence during open-line calls, then the victim's safety is protected from the aggressor, but the operator cannot provide real-time assistance or guidance

Engineering Contradiction:

Improveprotection from aggressorVSAvoidoperator assistance capability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent extracts the critical identification function from the audible communication channel. By using the additional identity tag or URL in the SIP call headers, the system extracts the open-line call status information from the voice communication, allowing the operator to be notified of the situation without requiring audible interaction that could be heard by the aggressor.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system skips the traditional audible confirmation step by automatically identifying open-line calls through the additional identity tag or URL in SIP headers. This allows the operator to be immediately notified of the open-line call status without requiring the victim to verbally confirm their situation, rushing through the identification process to minimize time exposed to the aggressor.

Inventive Principle:

Principle #21Skipping (Rushing through)

Data Source

PatentUS20250142310A1Automatically identifying a call associated with a wireless telecommunication network as an open-line call

Publication Date: 2025.05.01 T MOBILE US INC

AI summary

The system receives a SIP call from a UE associated with the user. The SIP call includes a call setup phase and a data transfer phase, where the call setup phase precedes the data transfer phase. The call setup phase includes an exchange of multiple header fields. The system obtains the multiple header fields from the SIP call. The system determines that the call is an open-line call by identifying an optional field within the multiple header fields, where the optional field indicates that the call is the open-line call. The open-line call indicates that the user of the UE cannot engage in a conversation with a receiver of the open-line call. Upon determining that the call is the open-line call, the system notifies an operator receiving the SIP call to not engage in an audible conversation with the user.