
Glossary
2
Cisco IP Telephony Network Design Guide
78-11103-03
Cisco AVVID
Cisco Architecture for Voice, Video, and Integrated Data
CLID
calling line ID
CO
central office
codec
coder-decoder
CoS
class of service
CPE
customer premises equipment.
cRTP
compressed Real-time Transport Protocol
D
DDI
direct dial inward
DHCP
Dynamic Host Configuration Protocol
DID
direct inward dial
DN
directory number
DNIS
dialed number identification service
DSCP
differentiated services code point
DSP
digital signal processor
DTMF
dual tone multifrequency
E—F
E1
Wide-area digital transmission scheme. E1 is the European equivalent of a T1
line.
E&M
recEive and transMit (or Ear and Mouth)
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