RTT Round Trip Time
SAS Streaming Audio Server
SDP Session Description Protocol
SDRAM Synchronous DRAM
sec seconds
SIP Session Initiation Protocol
SLIC Subscriber Line Interface Circuit
SP Service Provider
PAP2 Phone Adaptor Ports 2 (Linksys Phone Adaptor)
SSL Secure Socket Layer
TFTP Trivial File Transfer Protocol
TCP Transmission Control Protocol
UA User Agent
uC Micro-controller
UDP User Datagram Protocol
URL Uniform Resource Locator
VM Voice Mail
VMWI Visual Message Waiting Indication/Indicator
VQ Voice Quality
WAN Wide Area Network
XML Extensible Markup Language
ACD (Automatic Call Distribution): A switching system designed to allocate incoming calls to certain
positions or agents in the order received and to hold calls not ready to be handled (often with a
recorded announcement).
Area Code: A 3-digit code used in North America to identify a specific geographic telephone location.
The first digit can be any number between 2 and 9. The second and third digits can be any number.
Billing Increment: The division by which the call is rounded. In the field it is common to see full-minute
billing on the local invoice while 6-second rounding is the choice of most long-distance providers that
bill their customers directly.
Blocked Calls: Caused by an insufficient network facility that does not have enough lines to allow
calls to reach a given destination. May also pertain to a call from an originating number that is
blocked by the receiving telephone number.
Bundled Service: Offering various services as a complete package.
Call Completion: The point at which a dialed number is answered.
Call Termination: The point at which a call is disconnected.
CDR (Call Detail Records): A software program attached to a VoIP/telephone system that records
information about the telephone number’s activity.
Carrier’s Carrier: Companies that build fiber optic and microwave networks primarily selling to
resellers and carriers. Their main focus is on the wholesale and not the retail market.
Casual Access: Casual Access is when customers choose not to use their primary carriers to process
the long-distance call being made. The customer dials the carrier’s 101XXXX number.
CO (Central Office): Switching center for the local exchange carrier.
Centrex: This service is offered by the LEC to the end user. The feature-rich Centrex line offers the
same features and benefits as a PBX to a customer without the capital investment or maintenance
charges. The LEC charges a monthly fee to the customer, who must agree to sign a term agreement.
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