Information Technology Reference
In-Depth Information
Direct Inward Dial (DID)
A voice configuration that allows users from the PSTN to dial
directly into an individual phone at an organization without passing through a receptionist or
automated attendant application.
directed pickup
A method used with call pickup to answer a phone directly by dialing the
extension number of the ringing phone.
Disaster Recovery System (DRS)
The built-in Unified Communications platform backup
and restore utility.
dual-tone multifrequency (DTMF)
A type of address signaling in which the buttons on a
telephone keypad use a pair of high and low electrical frequencies to generate a signal each
time a caller presses a digit.
Dynamic Trunking Protocol (DTP)
Allows switches to dynamically negotiate trunk links.
E.164
An international numbering plan created by the ITU and adopted for use on the
PSTN.
Ear and Mouth (E&M)
Analog interface type that acts as a trunk to a PBX system.
ephone
A configuration in the CME router that represents a single IP phone (or IP telepho-
ny device).
ephone-dn
A configuration in the CME router that represents a single directory number
(DN).
extended super frame (ESF)
A modern T1 signaling method that sends 24 T1 frames at a
time.
Extensible Messaging and Presence Protocol (XMPP)
Used for instant messaging with
CUPS.
feature license
A license dictating the number of IP phones a Cisco Unified CME router is
able to support.
feature ring
Causes an IP phone to ring with three consecutive pulses; configured by using
the f button separator.
Foreign Exchange Office (FXO)
Analog interface type that connects to a telephone carrier
central office (CO) or PBX system; FXO ports receive dial tone from the attached device.
Foreign Exchange Office (FXO) ports
Analog interfaces that allow you to connect a VoIP
network to legacy telephony networks such as the PSTN or a PBX system.
Foreign Exchange Station (FXS)
Analog interface type that connects to a legacy analog
device (station); FXS ports provide dial tone to the attached device.
Foreign Exchange Station (FXS) ports
Analog interfaces that allow you to connect a
legacy analog telephony device to a VoIP network.
G.711
Uncompressed audio codec consuming 64 kbps of bandwidth.
G.726
Compressed audio codec consuming 32 kbps of bandwidth.
G.728
Compressed audio codec consuming 16 kbps of bandwidth.
