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Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)
© 2000 Cisco Systems, Inc. 6
Glossary of Terms
Following are some common terms and acronyms that may be used in this document.
Glossary
Acronym/Term Definition
.cnf
Configuration file used by devices.
µ-law (“mu-law”)
Companding technique commonly used in North America. µ-law is
standardized as a 64-kbps codec in ITU-T G.711.
A-law
ITU-T companding standard used in the conversion between analog
and digital signals in PCM systems. A-law is used primarily in European
telephone networks and is similar to the North American µ-law
standard.
ACF
Admission Confirm.
ANI
The calling number
ARQ
Admission Request.
B-Channel
Bearer channel. In ISDN, a full-duplex, 64-kbps channel used to send
user data.
Calling Search Space
The Calling Search Space defines what directory numbers and route
patterns a given device can call. It is a grouping of partitions to look
through when making a call. For example, assume there are several
Partitions in a Calling Search Space named “Executive.” If a
Cisco IP Phone number is in the “Executive” Calling Search Space,
then when initiating a call, it looks for the example “NYInternationalCall,”
“NYLongDistance,” “NYLocalCall,” and “NY911” Partitions available to
search through. A Cisco IP Phone number that has a “Guest” Calling
Search Space, for example, might only be allowed to search through
“NYLocalCall” and “NY911” Partitions, so that if the user tries to dial an
international number, it won’t find a match and the call can’t be routed.
CCAPi
Call Control API. Used by Cisco IOS to handle VoIP call processing.
CCO
Cisco Connection Online (http://www.cisco.com
). Provides the latest
information on Cisco products, technical support information, and
technical documentation.
CDR
Call Detail Record. Information about call origination, destination, and
duration, used to create billing records.
Cisco IOS
Cisco system software that provides common functionality, scalability,
and security for all products under the CiscoFusion architecture. Cisco
IOS allows centralized, integrated, and automated installation and
management of internetworks, while ensuring support for a wide variety
of protocols, media, services, and platforms.
Cluster
Cisco CallManager cluster. A logical grouping of several Cisco
CallManager servers.
CMR
Call Management Records, also known as Diagnostic CDRs. Records
that contain the count of bytes sent, packets sent, jitter, latency,
dropped packets, and so on.
codec
Coder-Decoder. A DSP software algorithm used to
compress/decompress speech or audio signals.
D-Channel
Data channel. Full-duplex, 16-kbps (BRI) or 64-kbps (PRI) ISDN
channel. Used for signaling and control.
DCF
Disengage Confirm.
DHCP
Dynamic Host Configuration Protocol. Provides a mechanism for
allocating IP addresses dynamically so that addresses can be reused
when hosts no longer need them.
DN
Directory Number. This is the phone number of an end device. It can be
a number assi
g
ned to a Cisco IP Phone, a Cisco IP SoftPhone, fax