IP PBX: how it works and when to keep it on site
An IP PBX runs your phone system over the IP network. How it works, what your network has to provide, and how on-premise and cloud PBX split the cost and the responsibility.
Sep 12, 2026
Explainers articles
Articles
What is VoLTE and what it means for a business mobile fleet
VoLTE carries mobile calls as IP packets over the 4G network. Here's how the call path works, how it compares with VoWiFi and CSFB, and what to check before 2G and 3G go off air.
Sep 1, 2026
What is a SIP trunk? A complete guide for European businesses
A SIP trunk connects your phone system to the public network over IP. How SIP trunking works, what it costs, and how to migrate without losing service.
Aug 25, 2026
What is PSTN? The public switched telephone network explained
How the public switched telephone network works, which equipment still depends on it, and how it compares with VoIP, SIP and WebRTC.
Aug 23, 2026
Computer telephony integration: a complete guide for business
Computer telephony integration ties your phone system to your CRM so an inbound call opens the right record. What it is, what to check, how GDPR applies.
Aug 21, 2026
DDI number: what it is and how call routing works
A DDI number maps one public number to one internal destination. How DDI routing works, how it sits next to the main company number, and how to configure direct numbers in a cloud PBX.
Aug 17, 2026
Suspected spam: what the label means for your calls
Suspected spam means a filter has scored a number as probably unwanted. How that score is built, what it costs outbound calling, and how to clear a false positive.
Aug 17, 2026
What is DTMF and why cloud phone menus depend on it
DTMF sends two tones per key so a phone system can read the choice. How the tones work, how they travel over VoIP, and what breaks them in a cloud PBX.
Aug 17, 2026
What is VoIP? A complete guide for 2026
VoIP carries your business calls over an IP network. How it works, what a cloud PBX changes, and why hosting location decides more than the price.
Aug 17, 2026
What is a cloud PBX, and how is it different from a desk phone setup?
A plain-language explainer on cloud phone systems for anyone weighing up a move off traditional lines.
May 28, 2026
EU mobile SIM with your company's fixed number
Bring your fixed business number to your mobile, with no app and no smartphone required. One professional number for every call, anywhere in Europe.
Nov 6, 2025
Broadcast announcements on your PBX
Send a manual or prerecorded announcement to every phone at once, or just one group. For celebrations, everyday notices, and emergencies when seconds count.
May 7, 2025
Is the fax dead?
Fax was built for analog lines, and Europe has moved to all-IP. Here is why fax over VoIP is unreliable, and what to use instead.
Apr 18, 2021
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