© 2003 - 2005 Sipura Technology, Inc
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MOH Music
On
Hold
MOS
Mean Opinion Score (1-5, the higher the better)
ms Millisecond
MSA
Music Source Adaptor
MWI
Message Waiting Indication
OSI
Open Switching Interval
PCB
Printed Circuit Board
PR Polarity
Reversal
PS Provisioning
Server
PSQM
Perceptual Speech Quality Measurement (1-5, the lower the better)
PSTN
Public Switched Telephone Network
NAT Network
Address Translation
OOB Out-of-band
REQT
(SIP) Request Message
RESP
(SIP) Response Message
RSC
(SIP) Response Status Code, such as 404, 302, 600
RTP
Real Time Protocol
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
SPA
Sipura 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
VMWI
Visual Message Waiting Indication/Indicator
VQ Voice
Quality
WAN
Wide Area Network
XML
Extensible Markup Language
9. Glossary
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.