What is a SIP trunk?
A SIP trunk is a virtual phone line delivered over your internet connection. It plugs into your existing on-premise PBX exactly where your ISDN30 or analogue lines used to, and it carries your calls out to the wider phone network.
Why businesses choose SIP over full replacement
- Protects your investment - the PBX, handsets, cabling and wallboards all stay.
- Lower call costs - free internal calls between sites, cheaper UK and international rates.
- Flexible capacity - add channels for busy periods and remove them again the next day.
- Disaster recovery built in - reroute numbers to a mobile, another site or a voicemail-to-email in seconds.
What you need to check first
Most PBXs sold in the last decade are SIP-ready or SIP-capable with a small firmware upgrade. Older systems may need a media gateway. Either way, we will audit your PBX free of charge and confirm exactly what is needed before quoting.
