This VoIP nugget explains how to interpret the 3CX Phone System server status logs. The nugget walks you through the setup and tear down of a phone call, explaining the messages that are generated along the way.
This nugget is an excellent way to learn how to use the server status logs to troubleshoot problems
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Firewalls and VoIP
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This video gives on overview of what Firewalls and VoIP are, how the two related and what the issues are with their configuration.
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RTP and SIP Overview
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This VoIP nugget gives a high level introduction about SIP and RTP. It highlights the useful basics and principles
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SIP Call Setup
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A high level overview of SIP Call setup and the ports involved