Authorized Self-Study Guide Cisco Voice over IP (CVoice)

Basic Components of Telephony Networks

A number of components must be in place for an end-to-end call to succeed. These components are listed here and shown in Figure 1-1:

• Edge devices

• Local loops

• Private or central office (CO) switches

• Trunks

Figure 1-1. Basic Components of a Telephony Network

[View full size image]

The next sections describe each of the basic components in more detail.

Edge Devices

The two types of edge devices used in a telephony network include:

• Analog telephones— Analog telephones are most common in home, small office/home office (SOHO), and small business environments. A direct connection to the public switched telephone ...