Best SIP Trunking Providers (2026)

5 SIP trunking providers ranked by advisors — $10–25/channel reality, POTS replacement, number porting, and when hosted VoIP wins instead.

Researched by Ivan Elias, Founder & Principal Advisor · Last updated October 2026

No fee · the whole market competes

SIP trunking replaces physical phone lines with internet-delivered calling for your existing PBX — typically cutting line costs while adding flexibility. The providers below are the ones we quote most for trunking projects, from national managed carriers to value specialists.

If you're replacing the PBX itself, compare hosted UCaaS instead — but for keeping on-prem systems and cutting line costs, SIP trunking is the move.

Trunking pricing is the most quote-driven corner of voice: channel rates flex with concurrency estimates, term length and bundled DIDs, and identical requirements can price meaningfully apart between carriers. Compare concurrent-call estimates rather than headline per-channel rates — that's where the real spread lives.

Sangoma Best for: PBX owners wanting an integrated stack

Contact Center & CX · Network & Voice · SD-WAN

One of North America's largest SIP trunking services, with own hardware and FreePBX ecosystem for tight integration.

AireSpring Best for: Value pricing & nationwide coverage

Cybersecurity · Managed Services · Network & Voice

Channel-favorite carrier with aggressive trunking pricing and strong multi-site delivery record.

TPx Best for: Fully managed trunking

Contact Center & CX · Cybersecurity · Managed Services

Managed service model — design, install, monitor — for IT teams that want the carrier to own outcomes.

Lingo Best for: Legacy line replacement

Cybersecurity · Mobility & IoT · Network & Voice

Long-tenured provider with practical SIP and POTS-replacement options for multi-location businesses.

Granite Best for: Multi-location SMBs

Managed Services · Mobility & IoT · Network & Voice

Nationwide voice and data specialist experienced in high-volume line conversions for distributed businesses.

How we ranked these providers

Scored on network reliability (30%), per-channel pricing value (25%), porting and implementation support (20%), managed options (15%) and contract flexibility (10%). Trunking is quote-based pricing almost everywhere; estimates reflect typical partner quotes. Editorial and independent.

The data behind this ranking: we track what businesses actually pay — negotiated pricing vs. list across 200+ providers, promo reverts and renewal drift — from live quote flow, not analyst estimates.

Frequently asked questions

How much does SIP trunking cost?

Typically $10–25 per concurrent call channel/month depending on volume and term. Quotes vary widely by usage profile, so compare concurrent-call estimates, not just headline rates.

Can I keep my numbers when switching to SIP?

Yes — numbers port to the SIP provider like any carrier change. Inventory hunt/fax/alarm lines first; see our number porting guide.

SIP trunking vs hosted VoIP — which is right?

Keep SIP trunking if your PBX is healthy and you want cheaper lines; choose hosted UCaaS if you're replacing the PBX anyway or want modern collaboration apps.

How do we get the best SIP trunking rate?

Quote by concurrent-call estimate, not line count, and get included bursts and DIDs in writing. Channel pricing flexes with term and volume — the negotiated-vs-list spread we track across providers applies to trunking too (see our pricing benchmarks).

Is SIP trunking still worth it with UCaaS everywhere?

Yes, when the PBX is healthy — trunking cuts line costs while keeping equipment you've already paid for. When the PBX needs replacing anyway, hosted wins; see our UCaaS ranking for that path.

Put every provider on this list in competition

Competing quotes side by side — no fee for clients, with better-than-list pricing.