SIP-Based Telephone Number Research for IMS and VoIP Networks

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Solution Overview

Problem

The migration from PSTN to NGN requires a telephone number research tool with SIP-based connectivity to ensure a smooth transition, as existing technologies fail to accurately determine the usage status of IP phone numbers, especially those assigned OAB-J numbers.

Innovation Solution

A telephone number research device connected via an NGN network to a telephone, utilizing a message exchange controller to add specific SDP parameters to INVITE requests, allowing determination of usage status without ringing an incoming call, and an SBC to convert IPv6 to IPv4 protocols for compatibility with IMS and VoIP networks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an INVITE request with incorrect SDP parameters is sent to verify IP phone number validity, then the research can determine usage status of 050-number IP phones, but it fails to accurately determine usage status of IP phones with OAB-J numbers due to network rejection

Engineering Contradiction:

Improveaccuracy of telephone number usage status determinationVSAvoidcoverage of different IP phone number types

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The invention changes the SDP parameter (specifically the network protocol parameter from IPv6 to IPv4) to adapt to different network types. By dynamically selecting the appropriate network protocol parameter based on the destination network type, the system can accurately determine usage status of both 050-number IP phones and OAB-J number IP phones without being rejected by the network

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system dynamically adjusts the SDP parameter based on the type of destination network. The message exchange controller selects different network protocol parameters (IPv6 for IMS network, IPv4 for VoIP network) according to the actual network environment, making the telephone number research device adaptable to various network configurations and phone number types

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If a SIP-based connectivity tool is developed for NGN network transition, then smooth migration from PSTN to NGN can be achieved, but existing tools lack the capability to handle both IMS and VoIP networks accurately

Engineering Contradiction:

Improvecompatibility with multiple network types (IMS and VoIP)VSAvoidaccuracy of telephone number usage status determination

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The telephone number research device is designed with multi-functionality to handle both IMS network and VoIP network. By incorporating the capability to send INVITE requests with dynamically selected SDP parameters appropriate for each network type, the single device can universally research telephone number usage status across different network architectures, achieving both adaptability and measurement precision

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12273399B2Device, method, program, and information provision system for telephone number research

Publication Date: 2025.04.08 CLOVER NETWORK COM CO LTD

AI summary

According to one embodiment, a telephone number research device researches on the usage status of a telephone number in an IMS network, an NGN network, and an IP network without ringing an incoming call by transmitting a specific SIP message that causes call rejection using an IMS interconnection interface or the like for interconnection between carriers. The telephone number research device is connected via an NGN network to a telephone connected to a destination network that is an IMS network or a VoIP network. The telephone number research device adds a first SDP parameter to an INVITE request for the telephone before sending the request to the destination network selected by the NGN network and determines the usage status of the telephone number of the telephone based on a response from the destination network regardless of the type of the destination network.