📖 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 — 14 terms
PSTN, ISDN, DID, DTMF, Caller ID, extensions, trunks, and other foundational terms.
🏢 PBX Systems — 16 terms
Cloud PBX, IP PBX, Hosted PBX, Asterisk, FreePBX, 3CX, UCaaS, and more.
🌐 VoIP Fundamentals — 14 terms
Voice over IP, packets, softphones, WebRTC, SBC, gateways, and adapters.
🔗 SIP Protocol — 38 terms
SIP methods (INVITE, BYE, REGISTER), response codes (200 OK, 404, 503), SDP, dialogs, and forking.
📡 SIP Trunking — 13 terms
SIP trunks, concurrent calls, IP authentication, STIR/SHAKEN, emergency calling, and number porting.
🔀 Call Routing and Features — 32 terms
IVR, call queues, forwarding, transfer, BLF, presence, call parking, and more.
📬 Voicemail and Messaging — 8 terms
Voicemail, voicemail-to-email, transcription, visual voicemail, and fax over IP.
💬 Unified Communications — 12 terms
UC, UCaaS, video conferencing, contact centres, omnichannel, and CPaaS.
🌊 Networking for VoIP — 20 terms
QoS, NAT, VLAN, latency, jitter, packet loss, firewalls, STUN, TURN, and ICE.
🎵 Audio, Media and Codecs — 24 terms
G.711, G.722, Opus, RTP, SRTP, echo cancellation, transcoding, and sampling rates.
🎧 Devices and Hardware — 17 terms
IP phones, headsets, DECT phones, conference phones, ATAs, gateways, and PoE switches.
🔒 Security — 14 terms
TLS, SRTP, VoIP fraud, Fail2Ban, ACLs, brute force attacks, and encryption.
🔍 Quality Metrics and Troubleshooting — 14 terms
MOS, one-way audio, CDR, Wireshark, SIP traces, call drops, and echo.
💰 Billing, Numbering and Telecom Business — 18 terms
SLAs, E.164, number porting, TCO, pricing models, and interconnection.
⚙️ Deployment and Administration — 18 terms
Auto-provisioning, failover, high availability, hot desking, and admin portals.
🔌 Integrations and APIs — 14 terms
CRM integration, Microsoft Teams, REST API, webhooks, SSO, and calendar sync.
🏗️ Advanced and Carrier-Level — 16 terms
Kamailio, Erlang formulas, geo-redundancy, SIPREC, load balancers, and BGP.
📋 Regulatory and Compliance — 10 terms
GDPR, call recording consent, emergency services, ILR, data residency.
🚀 Emerging Technologies — 12 terms
AI transcription, AI call summary, sentiment analysis, 5G, VoNR, and edge computing.
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