EPABX (Electronic Private Automatic Branch Exchange) : A private branch exchange (PBX) is a telephone exchange that serves a particular business or office, as opposed to one that a common carrier or telephone company operates for many businesses or for the general public.
IPBX
An IP PBX is a system that connects telephone extensions to the public switched telephone network and provides internal communication for a business. An IP PBX is a PBX system with IP connectivity and may provide additional audio, video, or instant messaging communication utilizing the TCP/IP protocol stack.
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Identify the problem.
Establish a theory of probable cause.
Test the theory to determine cause.
Establish a plan of action to resolve the problem and implement the solution.
Verify full system functionality and if applicable implement preventative measures.