Overview of Legacy and IP Telephony Networks
Introduction
Understanding emerging Voice over IP (VoIP) technologies requires a solid understanding of legacy telephony networks. Therefore, the Quick Reference Sheets in this section review many of the terms and concepts that surround legacy and packet telephony networks, and those technologies are then contrasted with IP Telephony technologies.
Legacy Telephony Networks
The Public Switched Telephone Network (PSTN) is at the heart of the legacy telephony network. PSTN components include the following items:
• Edge devices (for example, phones) are used by customers to interface with the PSTN.
• Local loops connect customer locations to a local central office (CO) over a pair of wires called tip and ...
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