Cloud PBX Glossary

Cloud PBX Glossary

📖 Cloud PBX Glossary covers over 350 telephony terms explained in plain language. No jargon, no prerequisites. Every definition is written for someone with zero prior knowledge. Use the search field below to find any term instantly, or browse by topic section.

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📞 Core Telephony Concepts
PSTN, ISDN, DID, DTMF, Caller ID, extensions, trunks, and other foundational terms.
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🏢 PBX Systems
Cloud PBX, IP PBX, Hosted PBX, Asterisk, FreePBX, 3CX, UCaaS, and more.
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🌐 VoIP Fundamentals
Voice over IP, packets, softphones, WebRTC, SBC, gateways, and adapters.
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🔗 SIP Protocol
SIP (INVITE, BYE, REGISTER), response codes (200 OK, 404, 503), SDP, dialogs, and forking.
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📡 SIP Trunking
SIP trunks, concurrent calls, IP auth, STIR/SHAKEN, emergency calling, and number porting.
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🔀 Call Routing and Features
IVR, call queues, forwarding, transfer, BLF, presence, call parking, and more.
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📬 Voicemail and Messaging
Voicemail, voicemail-to-email, transcription, visual voicemail, and fax over IP.
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💬 Unified Communications
UC, UCaaS, video conferencing, contact centres, omnichannel, and CPaaS.
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🌊 Networking for VoIP
QoS, NAT, VLAN, latency, jitter, packet loss, firewalls, STUN, TURN, and ICE.
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🎵 Audio, Media and Codecs
G.711, G.722, Opus, RTP, SRTP, echo cancellation, transcoding, and sampling rates.
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🎧 Devices and Hardware
IP phones, headsets, DECT phones, conference phones, ATAs, gateways, and PoE switches.
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🔒 Security
TLS, SRTP, VoIP fraud, Fail2Ban, ACLs, brute force attacks, and encryption.
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🔍 Quality Metrics and Troubleshooting
MOS, one-way audio, CDR, Wireshark, SIP traces, call drops, and echo.
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💰 Billing, Numbering and Telecom Business
SLAs, E.164, number porting, TCO, pricing models, and interconnection.
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⚙️ Deployment and Administration
Auto-provisioning, failover, high availability, hot desking, and admin portals.
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🔌 Integrations and APIs
CRM integration, Microsoft Teams, REST API, webhooks, SSO, and calendar sync.
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🏗️ Advanced and Carrier-Level
Kamailio, Erlang formulas, geo-redundancy, SIPREC, load balancers, and BGP.
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📋 Regulatory and Compliance
GDPR, call recording consent, emergency services, ILR, data residency.
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🚀 Emerging Technologies
AI transcription, AI call summary, sentiment analysis, 5G, VoNR, and edge computing.
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