Emergency SIP Subservice Signaling for Auto-Dialed Call Routing

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Solution Overview

Problem

Existing emergency call systems struggle to efficiently distinguish between auto-dialed and manually dialed calls, leading to inefficient resource utilization and processing delays at public safety access points (PSAPs).

Innovation Solution

User equipment (UE) transmits session initiation protocol (SIP) messages with subservice fields to indicate whether calls are auto-dialed or manually dialed, allowing public safety access points (PSAPs) to quickly identify and route emergency calls accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional emergency call systems are used without subservice fields, then all emergency calls are treated uniformly, but this leads to inefficient resource utilization and processing delays at PSAPs

Engineering Contradiction:

Improveemergency call handling efficiencyVSAvoidprocessing time at PSAP

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent segments emergency calls into two distinct categories: auto-dialed calls and manually-dialed calls. This is achieved by introducing subservice fields in SIP messages that explicitly indicate the call type. PSAPs can then process these segmented calls differently, applying optimized handling procedures for each category, thereby improving overall processing efficiency and reducing delays.

Inventive Principle:

Principle #1Segmentation

2Productivity

If subservice fields are added to SIP messages to distinguish call types, then call routing efficiency is improved, but message complexity increases

Engineering Contradiction:

Improvecall routing efficiencyVSAvoidSIP message structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent extracts the call type indication information into separate subservice fields within the SIP message structure. Rather than embedding this information throughout the message or using complex signaling mechanisms, the solution isolates the critical distinction (auto-dialed vs. manually-dialed) into dedicated fields, simplifying the overall processing logic at PSAPs while maintaining message structure integrity.

Inventive Principle:

Principle #2Taking out (Extraction)

3Device complexity

If uniform processing is applied to all emergency calls, then system simplicity is maintained, but resource utilization becomes inefficient

Engineering Contradiction:

Improvesystem processing complexityVSAvoidnetwork resource utilization

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The patent introduces dynamic processing capabilities to the emergency call system by enabling PSAPs to adapt their handling procedures based on the call type indicated in subservice fields. Auto-dialed calls can receive automated or prioritized processing, while manually-dialed calls follow traditional workflows. This dynamic approach optimizes network resource utilization without significantly increasing system complexity.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260025421A1User equipment auto-dialed emergency call management

Publication Date: 2026.01.22 T MOBILE US INC

AI summary

Techniques, devices, and systems for user equipment (UE) auto-dialed emergency call management are discussed herein. For example, UEs, which may be communicatively connected to wireless networks, may transmit communications associated with emergencies that include session initiation protocol (SIP) messages with subservice fields. The subservice fields can be utilized to indicate to PSAPs, to which the wireless networks route the SIP messages with the subservice fields, that the SIP messages are associated with UE auto-dialed calls.