ARA	Auerswald Remote Access
BLF	Busy Lamp Field
CCBS	Completion of Calls to Busy Subscriber
CCNR	Completion of Calls on No Reply
CIDR	Classless Inter-Domain Routing
CLIP	Calling Line Identification Presentation
CLIR	Calling Line Identification Restriction
CNG	Comfort Noise Generation
CTI	Computer Telephony Integration
DDI	Direct Dial In
DECT	Digital Enhanced Cordless Telecommunications
DHCP	Dynamic Host Configuration Protocol
DiffServ	Differentiated Services Flag
DNS	Domain Name Service
DSCP	Differentiated Services Code Point
DSL	Digital Subscriber Line
DTMF	Dual Tone Multi Frequency
ESMTP	Enhanced SMTP
GSM	Global System for Mobile communication
HTML	Hypertext Markup Language
HTTP	Hypertext Transfer Protocol
IMAP	Internet Message Access Protocol
IP	Internet Protocol
IPsec	Internet Protocol Security
ISDN	Integrated Services Digital Network
LAN	Local Area Network
LDAP	Lightweight Directory Access Protocol
LED	Light Emitting Diode
MAC	Media Access Control
MSN	Multiple Subscriber Number
MWI	Message Waiting Indication
NAT	Network Address Translation
NTP	Network Time Protocol
PBX	Private Branch Exchange
PDF	Portable Document Format
PIN	Personal Identification Number
PoE	Power over Ethernet
POP3	Post Office Protocol, version 3
PPTP	Point-to-Point Tunneling Protocol
PTMP	Point-to-Multipoint
PTP	Point-to-Point
RJ	Registered Jack
RTP	Real-Time Transport Protocol
SC	Short-Code (Dialling Number)
Scr.	Subscriber
SD	Secure Digital
SDHC	Secure Digital High Capacity
SIP	Session Initiation Protocol
SIPS	Session Initiation Protocol Secure
SMTP	Simple Mail Transfer Protocol
SRTP	Secure Real-Time Transport Protocol
SSL	Secure Sockets Layer (obsolete, see TLS
STUN	Simple Transversal of UDP over NATs
TAM	Telephone Answering Machine
TCP	Transmission Control Protocol
TLS	Transport Layer Security
UDP	User Datagram Protocol
URL	Uniform Resource Locator
USB	Universal Serial Bus
VLAN	Virtual Local Area Network
VMB	Voice Mailbox
VMF	Voice Mail and Fax
VoIP	Voice over Internet Protocol
VPN	Virtual Private Network
XML	Extensible Markup Language