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The Second level first step is to Analyze the Client log. If the results don't show any clear cause on the client side (ie: settings are ok and no issue issues have been reported by the audio module) then As said, once we got here we are mostly sure we're experiencing network issues on the server side. These issues the lead is on server side issues. These can be directly related to the Network uplinks links and their configuration or it might just be a server services misfunctioning side effectsome effect of service misfunctions. To settle the question about where it occurs, we need to Check Network Status, to understand if some communication issue are causing the Incident; if the network passes the tests, perform a Server services check.If any of the previous checks didn't lead to a solution or to identify a cause of the Incident, than our last resource is to Analyze the Client log and control if some warning messages arise or if the SIP communication is correct.
Once none of the above help us, we must escalate to the third level.