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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 (System 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 email, voice, and fax
messages from any telephone, PC, or information device.
Voice Mail: A system that allows storage and retrieval of voice messages through voicemail boxes.
10. Index
1
“Carrier Grade Voice Over IP”, 2nd Edition, Daniel Collins, McGraw-Hill, 2003
