Cisco AS5350XM Configuration Manual page 152

VoIP Basics
This chapter briefly introduces the subject of configuring VoIP and describes the first few configuration
tasks. It describes, at a high level, some of the voice QoS features that you can enable. Most important,
it points you to other references from which you can gain a broader and deeper look at the subject.
This chapter describes the following topics:
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It is critical that you consult the additional references cited throughout and at the end of the chapter
Tip
before you configure VoIP. These plus additional references throughout the Cisco website (search for
configure voip to locate the most current references) provide the information that you need to optimize
settings. The more information that you have at your disposal, the greater your probability of success,
as measured by cost savings and user acceptance.
Although VoIP technology is primarily software-based, it requires that you install a universal port or
Note
voice feature card into the appropriate slot of your Cisco AS5350XM or Cisco AS5400XM universal
gateway. The number of ports or channels available for sending VoIP data depends on the capacity of
your card. For more information, see
Dial-Only Feature Cards"
VoIP Basics
Before you configure VoIP on your gateway, it might help to understand at a high level what happens
when you place a VoIP call. Think of each event in a call flow as occurring on one of the several "legs"
of a call, as shown in the following typical scenario. (See
course, including ones where the call destination is an IP phone and the call never leaves the IP network.
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Cisco AS5350XM and Cisco AS5400XM Universal Gateways Software Configuration Guide
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VoIP Basics, page 2
Configuring Basic VoIP, page 6
Voice QoS Basics, page 15
Enabling QoS Features for VoIP, page 16
Additional Resources, page 21
or Chapter 6, "Managing and Troubleshooting the Voice Feature Card."
Call-leg 1: Originating device to originating gateway
Call-leg 2: Originating gateway into the IP network
Call-leg 3: IP network to destination gateway
Call-leg 4: Destination gateway to destination device
Chapter 5, "Managing and Troubleshooting the Universal Port and
Figure
Configuring Voice over IP
5.) Other scenarios are possible, of