SIP Trunking
Connect any SIP-capable PBX, session border controller or UC platform to the Aircom voice core. Channels scale with demand, numbers are typically live the same day, and built-in redundancy keeps you connected when a route or data centre has a bad day.
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The basics
SIP Trunking, explained.
A SIP trunk is a virtual voice connection that carries calls between your phone system (an IP-PBX, session border controller or UC platform) and the public telephone network over IP, replacing physical ISDN or PRI lines. Aircom's trunks flex their channels up and down on demand, and numbers are typically live the same day.
Wholesale vs retail SIP trunking
Retail SIP trunks are sold to a single business at a fixed channel count. Wholesale SIP trunking gives carriers and resellers elastic capacity, per-trunk routing control and usage-based commercials they can build their own products on top of.
What it does
Standards-based trunks that scale on demand.
Elastic SIP trunks for any IP-PBX or UC platform, with same-day DID provisioning and concurrency that flexes with you.
Elastic concurrency
Add or shed channels instantly, pay for the capacity you use, burst when campaigns spike.
Works with any platform
Standards-compliant SIP for Asterisk, FreeSWITCH, 3CX, Cisco, Avaya, Teams Direct Routing via a certified SBC, and more.
Geo-redundant registration
Geo-redundant points of presence with automatic re-registration so a single failure never drops your service.
Secure by default
IP authentication or digest, optional TLS/SRTP encryption, and per-trunk spend and fraud controls.
What you gain
Voice as critical infrastructure.
Engineered for carriers, resellers and businesses that treat voice as critical infrastructure, not a line item.
- Provision new trunks and numbers the same day
- Inbound, outbound or two-way per trunk
- Granular per-trunk caps and routing rules
- Transparent, usage-based billing
Ideal for
Built for these teams
- 01Enterprises replacing legacy ISDN/PRI
- 02UC providers needing dependable origination
- 03Teams Direct Routing via a certified SBC
SIP Trunking at a glance
Targets, not guesswork.
Capability targets for the Aircom voice platform, engineered for scale from day one.
Common questions
Questions, answered.
The essentials: how it works, what it costs and how to get started on the Aircom network.
A SIP trunk is a virtual line that connects your phone system to the telephone network over the internet, carrying inbound and outbound calls without physical ISDN or PRI circuits.
Yes. SIP trunking is the standard replacement for legacy ISDN and PRI, which UK operators are retiring as part of the PSTN switch-off. It runs over your existing internet connection or a private link and works with any standards-compliant PBX.
Our trunks are standards-based and work with Asterisk, FreeSWITCH, 3CX, Cisco, Avaya, Microsoft Teams Direct Routing (via a certified SBC) and any standards-compliant IP-PBX, SBC or UC platform.
Once commercials and KYC are agreed, SIP trunks and numbers can typically be live the same day.
The full portfolio
Explore more services.
The Aircom voice core powers a full carrier-grade portfolio. Combine services to fit your stack.
// Elastic Connectivity
Ready to put SIP Trunking to work?
Talk to our routing team about sip trunking and we will scope an interconnect built around your traffic.