Gateway Device for Voice Communication Across Overlapping Address Spaces
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Solution Overview
Problem
Existing voice communication systems face challenges when connecting networks with overlapping address spaces, requiring cumbersome address management and complex configuration with NAT routers.
Innovation Solution
A gateway device with protocol stacks for managing communication packets and a call control unit that determines re-transmission destinations based on call destination information, allowing voice communication between networks with overlapping address spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NAT routers are provided in each network for address conversion, then the two networks can be mutually connected, but the configuration becomes complicated and setting is cumbersome
Solution Approach 1:
The patent combines multiple NAT router functions into a single gateway device that connects two networks with overlapping address spaces. Instead of deploying separate NAT routers in each network, one gateway device performs address translation for both networks, reducing configuration complexity while maintaining connectivity reliability
Solution Approach 2:
The gateway device performs multiple functions including NAT address translation, routing between networks with overlapping address spaces, and call control. This multi-functional approach eliminates the need for separate dedicated NAT routers in each network, simplifying overall system configuration
2Reliability
If private addresses are changed to avoid duplication, then address duplication is avoided, but address management becomes extremely cumbersome
Solution Approach 1:
The gateway device acts as an intermediary that handles address translation between networks with overlapping private address spaces. Instead of manually changing addresses to avoid duplication, the gateway automatically translates addresses using NAT, maintaining address uniqueness while keeping management simple
Solution Approach 2:
The system changes the approach from static address assignment to dynamic address translation. The gateway dynamically translates private addresses to public addresses or addresses from the other network, eliminating the need for manual address changes while ensuring address uniqueness
3Ease of operation
If a gateway device is used to connect networks with overlapped address spaces, then address management is simplified, but the device requires advanced protocol stack management and call control functionality
Solution Approach 1:
The gateway device implements separate protocol stacks for each network (first protocol stack for first network, second protocol stack for second network). This segmentation allows independent management of each network's protocol requirements while simplifying the overall architecture through modular design
Data Source
AI summary
[Problem] To achieve a voice communication system which communicates between two networks that use partially overlapping address spaces.[Solution] According to the present invention, first and second networks are connected to one another by means of a gateway device provided with: a first protocol stack which manages transmission and reception addresses of communication packets in the first network; a second protocol stack which manages transmission and reception addresses of communication packets in the second network; and a call control unit which, upon reception of a communication packet from either network, determines the transfer destination network and transfer destination address of the packet on the basis of call destination information included in the packet.