Telephone System Call Routing 

Info
Level: Beginner
Presenter: Eli the Computer Guy
Date Created: August 8, 2010
Length of Class: 60 Minutes
Tracks
Telephone Systems
Prerequisites
Introduction to Telephone Systems
Purpose of Class
This class discusses how calls get routed within a telephone system PBX.
Topics Covered
Extensions
Call Paths
Out Calling
Incoming Trunk Groups
Auto Attendants
Hunt Groups
Call Groups
Out Going Call Routing
Class Notes
Introduction
All telephone systems use the same basic concepts to route calls
Extensions
PBX's relate to everything as an extension. A station is an extension. An Auto Attendant is an extension, etc.
You should create a range of extensions for use for stations and subscribers, and a different range of extensions to be used for administrative purposes (Auto Attendants, Hunt Groups, etc)
You can determine how many numbers make up an extension (2,3,4)
Call Paths
Call paths determine how an incoming call is routed.
A standard call path states that a station is rung 3 times, and then the call is routed to voicemail.
You can have call paths with 20+ steps.
Out Calling
Out calling allows the PBX to route calls from the outside to outside lines. A call from the outside can be routed to a cell phone.
Out calling requires 2 trunk lines (1 for the incoming call, and one for the outgoing call)
Out calling can be a HUGE security problem if not administered properly.
Incoming Trunks
Incoming trunk lines are programmed into Trunk Groups.
Individual Trunk Groups are pointed at a specific extension for incoming calls (Usually an Auto Attendant)
Multiple businesses in the same building can use the same PBX by putting their phone lines into Trunk Groups and then pointing the Trunk Group to their Auto Attendant.
Auto Attendants
"If you would like Sales press 1"
The message for the Auto Attendant resides on the Voicemail System.
You create an Extension, make it an Auto Attendant, point the message to a Voicemail box, determine what will happen when users press number keys, determine what happens if the user does nothing.
Hunt Groups
Are Extensions that when called ring a series of other extensions in order.
If the first extension in the hunt Group is busy, the next extension in the Hunt Group is rung.
Weighted or Smart Hunt Groups can route calls to extensions based on programmed parameters.
Call Groups
Call Groups are Extensions where numerous Extensions are rung at the same time when the Extension is dialed.
Outgoing Call Routing
You can create Outgoing Trunk Groups based on whether the trunk lines have local, long distance, or international calling privileges.
You can create codes to allow managers to be able to access any Outgoing Trunk Group.
Outgoing Call Routing is based on the number of digits dialed, and whether those digits match a pattern that allows the call to be routed to a specific Outgoing Trunk Group.

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