SIP Trunking

SIP trunking for business

SIP trunking connects your existing PBX to the phone network over the internet, swap costly copper lines and PRIs for scalable channels, easy number porting and crystal-clear HD voice.

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  • Same-day setup
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  • US-based support
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  • No contracts
What's included

A trunk that fits your phone system, not the other way around

Keep the PBX and numbers you already have. We supply the carrier-grade voice underneath, scalable, encrypted and priced by the channel.

Connect any IP-PBX

Point your FreePBX, 3CX, Asterisk, Yeastar or cloud PBX at our SIP trunks over UDP, TCP or TLS. Standard SIP and RTP/SRTP, no proprietary hardware, no rip-and-replace.

Scale channels up or down

Add concurrent call paths for a seasonal rush, then trim them when things settle. Month-to-month channels, you only pay for the capacity you actually run.

Keep or port your numbers

Bring the DIDs your customers already dial. We handle porting end to end, and can add local, toll-free or mobile numbers across 70+ countries alongside them.

Crystal-clear HD voice

Wideband G.722 and Opus codecs deliver clean, natural-sounding calls on carrier-grade routes, a noticeable step up from copper lines and PRIs.

Failover and redundancy

Trunks resolve across redundant regions, so if one path degrades, calls reroute in seconds. Encrypted signaling with TLS and SRTP keeps your traffic private.

Transparent per-channel pricing

Clear, month-to-month rates per channel, no line rental, no long contracts, no mystery fees. Tell us your call volume and we'll quote exact numbers.
How it works

How SIP trunking works

Three steps to move your calls off physical lines and onto the internet, usually without changing a single desk phone.

01

Point your PBX at our trunk

We provision your SIP trunk and send registration or IP-auth credentials. You drop them into your existing PBX, most teams are dialing the same day.

02

Bring your numbers and channels

Port in the DIDs you already use, add new local or toll-free numbers, and set the number of concurrent channels that matches your peak call volume.

03

Route calls over the internet

Inbound and outbound calls now travel over your broadband instead of physical phone lines, with failover, HD codecs and usage you can watch in real time.

Compatibility

Works with your PBX

Our trunks speak standard SIP, so they slot into whatever you already run, on-prem or hosted.

  • On-prem IP-PBX. FreePBX, Asterisk, 3CX, Yeastar, Grandstream and more, connect by registration or IP authentication over UDP, TCP or TLS.
  • Hosted or cloud PBX. Prefer not to manage hardware? Pair the trunk with our fully managed cloud phone system and skip the server entirely.
  • Legacy systems. Still on analog or PRI? We'll bridge your old PBX with a gateway, or plan a clean migration on your timeline.

Trunks are one layer of our voice stack. Explore our full VoIP services, let us host the phone system for you with Cloud PBX, or see transparent, month-to-month pricing.

FAQ

SIP trunking FAQ

The questions teams ask before moving their lines to SIP.

SIP trunking is a way to connect your existing phone system (an IP-PBX) to the public phone network over the internet instead of physical copper lines or a PRI. A SIP trunk carries your inbound and outbound calls as data, with each concurrent call using one channel. You keep your PBX and phone numbers and simply swap the underlying lines for internet-based trunks.

Ready to trunk your PBX?

Share your PBX and call volume and we'll send exact per-channel rates, or talk to a human at +1 (302) 366-3531.