SIP trunking on a network that stays clean
Origination and termination on our own switching fabric, sized for enterprise concurrency and protected by a traffic policy that keeps dialer minutes off the routes your calls use.
Replace brittle PRI capacity with elastic IP trunks
A SIP trunk should give you more capacity, better economics and fewer surprises than the circuits it replaces. Most deliver the first two.
CarrierLinkTel trunks terminate on session border controllers we own and operate in geographically diverse US facilities. Registration and media fail over automatically between clusters, so a facility event is a routing decision rather than an outage you have to manage.
Capacity is elastic. You contract a committed channel count for your steady state and burst above it when your business does — month-end, a product launch, a weather event — without renegotiating or waiting on a provisioning queue.
And because we refuse autodialer and short-duration traffic across the whole network, the routes your trunk uses are not shared with the campaigns that drive carrier blocking and analytics labelling. That is not a feature we can bolt on later; it is a consequence of who we let onto the network.
- Elastic concurrency. Committed channels with burst headroom, provisioned ahead of demand.
- Geo-redundant SBCs. Active-active clusters in diverse US facilities with automatic failover.
- Flexible interop. IP authentication or registration, with codec negotiation to suit your PBX.
- Quality-gated routing. A cheaper route is never selected unless it clears the quality floor.
- Full attestation. STIR/SHAKEN A-attestation where we have verified your number ownership.
What you get
Carrier-grade SBCs
Session border controllers we own and tune ourselves — topology hiding, NAT traversal, transcoding and per-trunk policy enforcement.
Burstable capacity
Contract for your steady state and burst above it when volume spikes, without a provisioning ticket or a renegotiation.
TLS and SRTP
Encrypted signalling and media end to end wherever your endpoints support it, with no additional licensing.
Intelligent failover
Automatic rerouting between SBC clusters and upstream carriers when a path degrades, typically inside a minute.
Live quality telemetry
ASR, ACD, MOS, PDD and jitter per trunk and per destination, visible to you rather than buried in our NOC.
Named engineer
An engineer who knows your dial plan, your PBX quirks and your escalation path before you have to explain them.
From scoping to live traffic
Scope the profile
We review destinations, concurrency, average duration, codecs and your PBX platform — and confirm the traffic fits our policy before anything else.
KYC and contract
Entity verification, number-ownership evidence and use-case review, run alongside the rate schedule and master service agreement.
Provision and test
Trunks, IP authentication, dial plan and attestation configured, then a supervised test window against your real endpoints.
Cut over
Phased migration with rollback at each stage, followed by continuous quality monitoring under a named engineer.
Technical summary
| Signalling | SIP over UDP, TCP or TLS 1.2+ |
|---|---|
| Media | RTP and SRTP, with re-invite and media release supported |
| Codecs | G.711 µ-law, G.729, G.722 and Opus, with transcoding where required |
| DTMF | RFC 2833 / RFC 4733, SIP INFO and in-band |
| Authentication | Static IP authentication or SIP digest registration |
| Fax | T.38 fax relay, with G.711 pass-through fallback |
| Concurrency | From 10 to 10,000+ simultaneous channels, burstable above commitment |
| Caller identity | STIR/SHAKEN signing with attestation based on verified number ownership |
| Billing increment | Six-second increments after a six-second minimum on domestic traffic |
| Emergency calling | E911 with Registered Location per number — see our Terms, Section 9 |
What customers ask
Almost certainly. We interoperate with the mainstream platforms — Cisco, Avaya, Mitel, 3CX, FreePBX, Asterisk, FreeSWITCH, Genesys and the major UCaaS stacks — and we handle codec and DTMF negotiation during the test window rather than leaving you to discover mismatches in production. Tell us what you run and we will confirm specifics before you sign.
Immediately. Burst headroom is provisioned on the platform in advance, not allocated on request, so a spike is carried rather than queued. We agree a burst ceiling with you up front and alert you as you approach it. Sustained traffic well above commitment is a conversation about re-rating, not a penalty.
Our routing engine watches ASR, ACD and MOS per destination against the route baseline. A route that falls below threshold is withdrawn from rotation automatically and re-tested before it returns. Because we hold diverse interconnects per destination, the failover is another carrier rather than a busy signal.
No. Geo-redundancy, automatic failover and encryption are how the platform is built, not upsells. You pay for channels and usage.
Yes — port them in, and we will validate your CSR against the port request before submission to avoid the rejections that cause most porting delays. You will need to evidence your right to use any numbers you present as calling party, which is what lets us sign them at full attestation.
Often bought together
SIP Termination
Direct-to-carrier outbound routing with verified caller identity and quality-gated least-cost logic.
ExploreLocal DID Numbers
Local presence in every US rate centre, provisioned in bulk and ported cleanly.
ExploreContact Center Voice
High-concurrency conversational voice built for enterprise CX operations.
ExplorePut a trunk under supervised test
Send us your traffic profile and we will scope channels, routing and attestation, then run live traffic under engineer supervision so you can compare the quality telemetry against what you have today.