Problem: Route Flapping
Routers can occasionally enter a state in which they periodically switch route, typically every few minutes. This results in the delay alternately increasing and reducing.
Impact
As this usually occurs at a fairly low frequency (say every 30 seconds) then the impact on VoIP call quality is small, generally appearing as an occasional 'tick'.
Resolution
Use traceroute to determine where the problem is occurring. Resolution may require reconfiguration of routers.
Tools:
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