- ACL - Access Control List
- ADSL - Asymmetric Digital Subscriber Line
- AP - Access Point
- ARP - Address Resolution Protocol
- AS - Autonomous System
- ATM - Asynchronous Transfer Mode
- BGP - Border Gateway Protocol
- BOOTP - Bootstrap Protocol
- CDP - Cisco Discovery Protocol
- CIDR - Classless Inter-Domain Routing
- CPE - Customer Premises Equipment
- CRC - Cyclic Redundancy Check
- CSMA/CD - Carrier Sense Multiple Access with Collision Detection
- DHCP - Dynamic Host Configuration Protocol
- DNS - Domain Name System
- DoS - Denial of Service
- DSL - Digital Subscriber Line
- EIGRP - Enhanced Interior Gateway Routing Protocol
- FDDI - Fiber Distributed Data Interface
- FTP - File Transfer Protocol
- GRE - Generic Routing Encapsulation
- HDLC - High-Level Data Link Control
- HSRP - Hot Standby Router Protocol
- HTTP - Hypertext Transfer Protocol
- ICMP - Internet Control Message Protocol
- IEEE - Institute of Electrical and Electronics Engineers
- IGP - Interior Gateway Protocol
- IMAP - Internet Message Access Protocol
- IP - Internet Protocol
- IPS - Intrusion Prevention System
- IPSec - Internet Protocol Security
- ISDN - Integrated Services Digital Network
- ISP - Internet Service Provider
- LAN - Local Area Network
- LDP - Label Distribution Protocol
- LSA - Link State Advertisement
- MAC - Media Access Control
- MPLS - Multi-Protocol Label Switching
- NAT - Network Address Translation
- NTP - Network Time Protocol
- OSPF - Open Shortest Path First
- PAP - Password Authentication Protocol
- PAT - Port Address Translation
- PBX - Private Branch Exchange
- PDU - Protocol Data Unit
- PPP - Point-to-Point Protocol
- PPTP - Point-to-Point Tunneling Protocol
- QoS - Quality of Service
- RADIUS - Remote Authentication Dial-In User Service
- RIP - Routing Information Protocol
- RIPv2 - Routing Information Protocol version 2
- ROM - Read-Only Memory
- RPC - Remote Procedure Call
- RSVP - Resource Reservation Protocol
- SAN - Storage Area Network
- SDN - Software-Defined Networking
- SIP - Session Initiation Protocol
- SMTP - Simple Mail Transfer Protocol
- SNMP - Simple Network Management Protocol
- SONET - Synchronous Optical Network
- SSH - Secure Shell
- SSL/TLS - Secure Sockets Layer/Transport Layer Security
- STP - Spanning Tree Protocol
- SVI - Switched Virtual Interface
- TCP - Transmission Control Protocol
- TFTP - Trivial File Transfer Protocol
- TLD - Top-Level Domain
- UDP - User Datagram Protocol
- URL - Uniform Resource Locator
- VLAN - Virtual Local Area Network
- VLSM - Variable Length Subnet Masking
- VRRP - Virtual Router Redundancy Protocol
- VPN - Virtual Private Network
- VTP - VLAN Trunking Protocol
- WAP - Wireless Access Point
- WEP - Wired Equivalent Privacy
- WPA - Wi-Fi Protected Access
- WPA2 - Wi-Fi Protected Access II
- WWW - World Wide
- ACD - Automatic Call Distributor
- AES - Advanced Encryption Standard
- API - Application Programming Interface
- ARS - Automatic Route Selection
- ATA - Analog Telephone Adapter
- ATT - Analog Telephone Terminal
- BYOD - Bring Your Own Device
- CDR - Call Detail Record
- CMS - Call Management System
- CRM - Customer Relationship Management
- CTI - Computer Telephony Integration
- DND - Do Not Disturb
- E1 - European E-carrier Level 1
- E911 - Enhanced 911
- EHS - Electronic Hook Switch
- FMC - Fixed Mobile Convergence
- FOIP - Fax Over IP
- FXO - Foreign Exchange Office
- FXS - Foreign Exchange Station
- G.711 - Pulse Code Modulation
- G.722 - Wideband Audio
- G.729 - Voice Compression
- H.323 - Video Conferencing Protocol
- HD Voice - High-Definition Voice
- HTTPS - Hypertext Transfer Protocol Secure
- IAX - Inter-Asterisk eXchange
- IETF - Internet Engineering Task Force
- IM - Instant Messaging
- IP PBX - Internet Protocol Private Branch Exchange
- IP Phone - Internet Protocol Phone
- ISDN - Integrated Services Digital Network
- ITSP - Internet Telephony Service Provider
- IVR - Interactive Voice Response
- Jitter - Variation in Packet Delay
- LDAP - Lightweight Directory Access Protocol
- LTE - Long-Term Evolution
- MMS - Multimedia Messaging Service
- MOH - Music On Hold
- MPLS - Multi-Protocol Label Switching
- MRC - Monthly Recurring Charge
- NAT - Network Address Translation
- NTP - Network Time Protocol
- OCS - Office Communications Server
- PBX - Private Branch Exchange
- POTS - Plain Old Telephone Service
- PRI - Primary Rate Interface
- QoS - Quality of Service
- RAS - Remote Access Server
- RC - Remote Control
- RFC - Request for Comments
- ROI - Return on Investment
- RTCP - Real-Time Control Protocol
- RTP - Real-Time Transport Protocol
- SBC - Session Border Controller
- SD-WAN - Software-Defined Wide Area Network
- SIP - Session Initiation Protocol
- SMS - Short Message Service
- SNMP - Simple Network Management Protocol
- SRTP - Secure Real-Time Transport Protocol
- SSL/TLS - Secure Sockets Layer/Transport Layer Security
- STUN - Simple Traversal of UDP through NATs
- TAPI - Telephony Application Programming Interface
- TCP - Transmission Control Protocol
- TDM - Time Division Multiplexing
- TFTP - Trivial File Transfer Protocol
- TLS - Transport Layer Security
- UC - Unified Communications
- UCaaS - Unified Communications as a Service
- UDP - User Datagram Protocol
- URL - Uniform Resource Locator
- USB - Universal Serial Bus
- VaaS - Video as a Service
- VC - Video Conferencing
- VDI - Virtual Desktop Infrastructure
- VLAN - Virtual Local Area Network
- VNC - Virtual Network Computing
- VoIP - Voice over Internet Protocol
- VPN - Virtual Private Network
- VTC - Video Teleconferencing
