CCNA Voice Study – Cisco VoIP Structure

Much like the OSI model Cisco has a standardized reference model to explain the various components that make up a unified communications system. From top down:

Endpoints – IP Phones, Cell Phones, Video Phone, IM Client aka what the user touches.

Applications – Voice Mail, Conference Call Apps, Call Center Apps, 911 Services aka feature rich services.

Call Processing – CUCM, CUCME, UC500 aka what handles call flow.

Infrastructure – ASA Firewall, Voice Router / Gateway, Voice switch aka what all the above layers need to communicate together.

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