Linksys SPA921 Cisco SPA9000 Voice System Administration Guide - Page 282

Glossary E North American Numbering Plan (NANP)-How telephone numbers are identified in North America. The telephone number can be identified based on their three separate components: (NPA), (NXX), and (XXXX). PIN (Personal Identification Code)-A customer calling/billing code for prepaid and pay-as-you-go calling cards. Private Branch Exchange-Advanced phone system commonly used by the medium to larger customer. It allows the customer to perform a variety of in-house routing (inside calling). The dial tone that is heard when the customer picks up the phone is an internal dial tone. SS7 (Signaling Number 7)-Technology used by large carriers to increase the reliability and speed of transmission between switches. Switch (switching)-Equipment that connects and routes calls and provides other interim functions such as least cost routing, IVR, and voicemail. It performs the "traffic cop" function of telecommunications via automated management decisions. Touchtone (DTMF)-The tone recognized by a push button (touchtone) telephone. Unified messaging- Platform that lets users send, receive, and manage all e-mail, voice, and fax messages from any telephone, PC, or information device. Voicemail-A system that allows storage and retrieval of voice messages through voice-mail boxes. SPA9000 Voice System Administration Guide 280