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ZunoTel SIP trunking is the cost-effective ISDN replacement for UK businesses that want to modernise their telephony without replacing their existing PBX. Our SIP trunks connect directly to your on-premise or hosted phone system, delivering HD voice quality, number portability, and significant savings on line rental and call charges — with channels that scale up or down in real time.
Our VoIP platform is packed with enterprise-grade features designed to keep your UK business connected, productive, and scalable at every stage of growth.
Businesses switching from ISDN typically save 40–60% on line rental and call charges within the first month.
Automatic disaster recovery routing redirects calls to a backup destination in seconds if your primary site goes offline.
Compatible with all major IP-PBX platforms including Cisco, Avaya, 3CX, FreePBX, Asterisk and Microsoft Teams Direct Routing.
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