Before deploying VoIP, it is imperative to verify that the wall jack, patch cable, switch ports, etc are working; power should flow from the switch to the phone; communication between the phone and server should be consistent; and baseline metrics should be established.
Once a network is deployed, the conversation between the phone and the network should be monitored; the call setup time should be assessed; QoS scores should be compared with objectives; and the baseline performance should be measured.
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