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Business Telephony, VoIP & Cloud PBX Glossary

Plain-language definitions of every telephony term that matters for running a business in Luxembourg, the Greater Region, and across Europe.

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500+ terms

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19 sections

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Start here: the 5 terms business owners ask about most

If you only have a minute, these are the ones that come up in every contract.

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01 | SIP Trunking

The digital line that connects your phone system to the outside world.

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02 | Call Recording

Recording conversations for training, compliance, or quality assurance.

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03 | Softphone

A phone app that runs on your computer or mobile device.

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04 | Mobile Application

Your business number on your personal device, without mixing work and personal calls.

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05 | Presence-Aware Call Routing

Calls reach the right person based on who's available, not who's next on the list.

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Browse by Topic

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📞 Core Telephony Concepts

Key terms: PSTN · ISDN · DID · DTMF · Caller ID · Extensions · Trunks · +11 more

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🌐 VoIP Fundamentals

Key terms: VoIP · RTP · RTCP · Packetization · WebRTC · SBC · Gateway · +9 more

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⚡ SIP Trunking

Key terms: SIP trunk · Concurrent calls · IP auth · STIR/SHAKEN · Emergency calling · +9 more

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📬 Voicemail and Messaging

Key terms: Voicemail · Voicemail-to-email · Transcription · Visual voicemail · +7 more

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🌊 Networking for VoIP

Key terms: QoS · NAT · VLAN · Latency · Jitter · Packet loss · Firewalls · STUN · TURN · +9 more

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🎧 Devices and Hardware

Key terms: IP phones · Headsets · DECT phones · Conference phones · ATAs · +7 more

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🔍 Quality Metrics and Troubleshooting

Key terms: MOS · One-way audio · CDR · Wireshark · SIP traces · Call drops · Echo · +8 more

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⚙️ Deployment and Administration

Key terms: Auto-provisioning · Failover · High availability · Admin portals · +8 more

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🏗️ Advanced and Carrier-Level

Key terms: Kamailio · Erlang formulas · Geo-redundancy · SIPREC · Load balancers · +8 more

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🚀 Emerging Technologies

Key terms: AI transcription & Summary · Sentiment analysis · 5G · Edge computing · +8 more

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🏢 PBX Systems

Key terms: Cloud PBX · IP PBX · Hosted PBX · Asterisk · FreePBX · 3CX · UCaaS · +8 more

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Definitions are just the entry point

Every glossary term links to where it matters: features that use it, providers that offer it, scenarios that need it.

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