IPFAX Session Control via Network Type Detection
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Solution Overview
Problem
Conventional IPFAX devices cannot simultaneously connect to both local and public IP networks, leading to unnecessary charging and limitations in communication modes, as they cannot differentiate between network types based on INVITE messages, resulting in incorrect media type specifications.
Innovation Solution
An image processing apparatus with a reception unit, determination unit, and control unit that analyzes session start messages to determine the network type and media type, allowing or rejecting sessions to prevent unnecessary charging and ensure correct media type specifications for IPFAX communication across both local and public IP networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the media type is set to 'audio' for SIP server communication on local IP network, then connection establishment is enabled, but unnecessary charging occurs on public IP network
Solution Approach 1:
The patent applies local quality by making the media type specification context-dependent on the network type. The determination unit identifies whether the incoming connection is from a local IP network or public IP network, and the control unit selectively sets the media type to 'audio' only for local networks while using 'image' for public networks. This localized adaptation resolves the contradiction by enabling reliable connection establishment on local networks without incurring unnecessary charges on public networks.
2Manufacturing precision
If the media type is set to 'image' for public IP network communication, then correct media specification is achieved, but connection from local IP network fails
Solution Approach 1:
The patent implements dynamics by making the media type specification adaptive rather than static. The control unit dynamically changes the media type based on the detected network type: using 'image' for public IP networks to ensure correct specification, and switching to 'audio' for local IP networks to maintain connection compatibility. This dynamic adjustment resolves the contradiction between precision and versatility.
3Device complexity
If conventional IPFAX devices operate in single mode (local or public), then device complexity is reduced, but adaptability to diversified networks is limited
Solution Approach 1:
The patent applies self-service by enabling the IPFAX device to automatically identify the network type and select the appropriate media type without requiring manual user configuration. The determination unit autonomously detects whether the incoming connection is from a local or public IP network, and the control unit automatically adjusts the media type accordingly. This self-service mechanism resolves the contradiction by providing multi-network adaptability while maintaining simple operation for users.
Data Source
AI summary
An image processing apparatus includes a reception unit configured to receive a session start message, a determination unit configured to determine whether the session start message received by the reception unit is a session start message from a public Internet Protocol network or a session start message from a local Internet Protocol network, an acquisition unit configured to acquire a media type included in the session start message received by the reception unit, and a control unit configured to determine whether a start of a session is allowed, based on a result determined by the determination unit and the media type acquired by the acquisition unit.