SIP trunks replace traditional PSTN lines with flexible, internet-based voice channels — giving your business the ability to scale call capacity on demand, connect multiple sites under one dial plan, and secure every call with encryption.
SIP trunking is the connection layer between your PBX — whether cloud, private cloud, or on-premise — and the public telephone network. Unlike traditional PSTN lines, SIP trunks are software-defined: you add channels when call volume grows, remove them when it drops, and pay only for what you use.
For multi-site businesses, SIP trunking enables a unified dial plan across all locations — staff at one site call staff at another using a short extension number, with no per-call cost. Incoming calls can be routed to any site or any agent regardless of where the trunk lands.
Add or remove concurrent call channels based on actual demand — no physical line cards, no waiting for an engineer to install new circuits.
Calls between your offices, branches, and remote workers route internally over your SIP infrastructure — no per-call cost, regardless of geography.
All locations share a single extension numbering plan — staff dial short extensions to reach colleagues at any site, and inbound numbers can ring at any location.
All SIP signalling is encrypted with TLS and media is protected with SRTP — calls cannot be intercepted in transit, suitable for regulated and security-sensitive environments.
Voice traffic is prioritised over your network with Quality of Service (QoS) and VLAN segmentation — eliminating jitter and packet loss that degrades call quality.
Secondary SIP trunks or PSTN backup lines activate automatically if the primary trunk becomes unavailable — inbound calls keep routing without interruption.
Keep your existing telephone numbers when migrating to SIP trunking — numbers port to the new platform with no change visible to callers.
We'll assess your current line setup, call volumes, and site configuration — then recommend a SIP trunking design that improves reliability and removes unnecessary capacity constraints.