Router-Based VoIP Link Failure Recovery via RTP Monitoring
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Solution Overview
Problem
VoIP service networks face challenges in rapid link failure detection and recovery, particularly in networks with media gateways, where current methods are inefficient and cannot perform detour connections for active voice sessions, leading to potential call setup and media transmission failures.
Innovation Solution
A network system and method that utilize a router to monitor real-time transport protocol (RTP) ports for link failures, rapidly inform a media gateway controller, and allocate a new media gateway for detour connections, with link failure determination based on RTP codec and multiframe count, enabling efficient recovery from link failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a short link check time is set to rapidly detect link failure, then link failure detection speed is improved, but the media gateway experiences excessive load
Solution Approach 1:
The patent introduces a link check function in the router that acts as an intermediary between the media gateway controller and media gateway. The router monitors RTP packets and detects link failures independently, then reports failures to the media gateway controller. This distributes the monitoring burden from the media gateway to the router, reducing media gateway load while maintaining rapid failure detection capability.
2Productivity
If link check time is extended to reduce media gateway load, then media gateway performance is improved, but link failure detection speed deteriorates
Solution Approach 1:
The router serves as an intermediary that performs continuous link monitoring without burdening the media gateway. The router checks for RTP packets from the media gateway and immediately detects link failures, then reports them to the media gateway controller. This allows the media gateway to focus on voice processing while the router handles monitoring, achieving both rapid detection and high media gateway efficiency.
3Reliability
If the media gateway controller checks link status, then link failure detection is possible, but detour connection cannot be performed for active voice sessions
Solution Approach 1:
The router acts as an intermediary that detects link failures and reports them to the media gateway controller, which then initiates detour connections. This separation of detection and recovery functions enables the system to maintain active voice sessions while performing detour connections, as the media gateway controller can reassign calls to backup media gateways without interrupting ongoing communications.
Data Source
AI summary
A network system for recovering from a link failure in a Voice over Internet Protocol (VoIP) service comprises: a first media gateway having a current link setting and transmitting a corresponding packet upwardly for the VoIP service; a second media gateway which is link-connected to the same remote terminal as the first media gateway for the VoIP service; a media gateway controller for allocating the second media gateway for link resetting, and for transmitting allocation information when receiving failure information of a link set through the first media gateway; and a router for determining whether a packet transmitted from the first media gateway is received within a set time to determine whether there is a failure of the set link, for transmitting the link failure information to the media gateway controller, and for resetting the link to the second media gateway according to the allocation information transmitted from the media gateway controller when there is a link failure. A method for recovering from a link failure in a VoIP serviced comprises steps corresponding to the aforementioned functions.