ATCOM A20 User Manual page 24

A20/A21/A20W/A21W IP Phone User Manual A20/A21/A20W/A21W IP Phone User Manual
6. Abbreviations
DND ： Do Not Disturb
CFWD ： Call Forward
Bxfer ： Blind Transfer
Conf ： Conference
Num ： Number
DelChr ： Delete Char
Y/N ： Yes/No
SIP：Session Initiate Protocol
RTP：Real-time Transport Protocol
SDP：Session Description Protocol
VPN：Virtual Private Network
VLAN：Virtual Local Area Network
QoS：Quality of Service
Syslog ： System log UDP：User Data
Protocol TCP：Transmission Control
Protocol TLS：Transport Layer Security
Protocol BLF：Busy Lamp Field
DNS：Domain Name System
SRTP：Secure Real-time Transport Protocol
NTP：Network Time Protocol
VAD：Voice Activity Detection
CNG：Comfort Noise Generator
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