DNS-Based Load Balancing for Secure Audio Conferencing Bridges
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Solution Overview
Problem
Existing audio conferencing systems face challenges in allowing Internet VoIP users to access audio conferencing bridges securely and efficiently without manually setting up SIP trunks and ensuring authentication and encryption.
Innovation Solution
Implementing a Bridge Interface Layer that provides registrar, proxy, and authentication services, using DNS for load balancing, and encrypting SIP and RTP messages, allowing Internet VoIP users to connect securely to audio conferencing platforms by prioritizing audio conferencing system identities and routing SIP Invites through a list of available bridges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual SIP trunk setup is implemented for each user, then security and authentication are ensured, but device complexity and setup time increase significantly
Solution Approach 1:
The patent introduces a DNS server as an intermediary component that automatically resolves user connections to audio conferencing bridges. Instead of manually configuring SIP trunks for each user, the DNS server acts as a mediator that receives DNS lookup requests from softphones and returns prioritized lists of bridge identities, enabling automatic connection establishment while maintaining security through centralized authentication mechanisms.
Solution Approach 2:
The system enables self-service by allowing softphones to automatically perform DNS lookups and establish connections to audio conferencing bridges without manual configuration. Users can directly access bridges using DNS names, and the system automatically handles connection routing, authentication, and load balancing, eliminating the need for manual SIP trunk setup for each user.
2Productivity
If DNS load balancing is implemented, then connection efficiency and user access speed improve, but system reliability may be compromised without proper authentication
Solution Approach 1:
The patent implements preliminary authentication actions by requiring softphones to authenticate with the audio conferencing bridge before establishing media connections. The DNS load balancing provides prioritized lists of bridges, but authentication credentials are validated in advance through SIP registration and authentication protocols, ensuring security is established before productivity benefits are realized.
3Reliability
If multiple audio conferencing bridges are used for load balancing, then system availability improves, but connection management complexity increases
Solution Approach 1:
The patent makes the DNS server multi-functional by having it perform multiple roles: load balancing across multiple audio conferencing bridges, providing prioritized routing, enabling failover capabilities, and supporting both direct DNS name resolution and SIP trunk routing. This universal approach to connection management simplifies the system architecture compared to implementing separate management mechanisms for each function.
Data Source
AI summary
To enable load balancing and the like for audio conferencing systems of an audio conferencing network, a DNS server may receive a DNS lookup from an internet softphone and return a prioritized list of audio conferencing system identities. The internet softphone may select an audio conferencing system and forward a SIP Invite to a Bridge interface layer of the respective audio conferencing system. If the SIP Invite does not generate a successful connection or generates a timeout, the internet softphone forwards the SIP Invite to the next prioritized Bridge interface layer in the list.