Bandwidth vs Telnyx vs SIPNEX Compared

Bandwidth, Telnyx, and SIPNEX sell SIP trunks in three very different ways. Bandwidth is the wholesale giant — the network behind many other providers. Telnyx is the developer platform that runs its own network. SIPNEX is the carrier built by operators, for operators. Each one wins in a different setting. Pick the wrong one and you pay in money, performance, or both.

This comparison is written by SIPNEX. We compete with both companies. We will still tell you which one fits your shop — even when the answer is not us. For deeper dives, see Twilio vs SIPNEX, Telnyx vs SIPNEX, and our Best SIP Trunk Providers guide.

Updated August 2026: we re-checked Telnyx billing increments, each company’s FCC license status, and FCC number-porting timelines against primary sources, and corrected this page where the facts had drifted.

Quick comparison

Factor	Bandwidth	Telnyx	SIPNEX
Type	Wholesale carrier	CPaaS with own network	Direct carrier
FCC License	Yes	Yes	Yes
Own STIR/SHAKEN cert	Yes	Yes	Yes
A-level attestation	Yes	Yes	Yes
Concurrent channels	Account-dependent	Scalable (may charge per-channel)	Unlimited, no fee
Published pricing	No (enterprise sales)	Yes	Yes
Developer API	Yes (enterprise)	Yes (extensive)	No
Billing increment	6-second	60-second (60/60)	12/6
VICIdial-specific support	No	No	Yes
Minimum commitment	Often required	Varies	None
Best for	Enterprise, CPaaS companies	Developers, mid-market	Dialer operators

Bandwidth: the wholesale giant

Strengths: Bandwidth owns and runs its own nationwide all-IP voice network — the rails under many big UCaaS and CPaaS platforms. Buy from another brand and your calls may still ride on Bandwidth. It is a direct carrier with full FCC licensing. Call quality is excellent, and its US peering is strong. The full company profile is in our Bandwidth.com explainer.

Limits for call centers: Pricing goes through enterprise sales. You usually need a sales call to get a quote, and minimum commits are common. Support is built for large accounts, not 20 to 100 agent shops. The network serves a broad market — UCaaS, CPaaS, and enterprise — and is not tuned for dialer traffic. Per-channel or trunk-level pricing may apply.

Best fit: Enterprises with 500+ agents. Firms building a CPaaS or UCaaS product on carrier rails. Shops that can commit to big monthly volume and want a dedicated account team.

Telnyx: the developer platform

Strengths: Developer-friendly APIs with good docs. Telnyx runs its own network and is a licensed carrier — it holds its own FCC Form 499 filing and a Section 214 authority, not just a platform badge. Rates are published on its site. The product line is broad: voice, messaging, IoT, and networking. Global points of presence give it real international reach.

Limits for call centers: Telnyx’s published billing documentation lists US voice at 60-second increments (60/60), with 6-second billing no longer offered. A 10-second call is billed as a full minute. On short dialer calls, that rounding adds real cost. Sustained fast dialing can also trigger its calls-per-second surcharge. And support is broad across the whole product line rather than deep on dialers.

Best fit: Technical teams building custom voice apps. Mid-market shops that want API control with better rates than Twilio. Operations that call many countries.

SIPNEX: the operator-owned carrier

Strengths: Purpose-built for predictive dialer and VICIdial work. Unlimited channels with no per-channel fee. Published wholesale pricing tuned for high-volume outbound, billed 12/6 — 6-second increments after a 12-second minimum. Own FCC license, own STIR/SHAKEN cert, own 499 filing. The support team runs VICIdial and knows dialer problems cold. No minimum commitment.

Limits: No developer API. US-focused — thin international coverage next to Bandwidth or Telnyx. Narrow product focus: voice and DIDs only. Not built for custom apps or platform products.

Best fit: Call centers with 20 to 500 agents running predictive or progressive dialing. VICIdial and Asterisk shops. Any high-volume US outbound operation where cost, attestation, and support quality come first.

Which one should you pick?

Pick Bandwidth if:

• You run 500+ agents or build your own comms platform.
• You can commit to big monthly volume for contract rates.
• You want the network many other providers build on.

Pick Telnyx if:

• Your team builds custom voice apps and lives in APIs.
• You need wide international coverage from one vendor.
• Your calls run long, so 60-second billing costs you little.

Pick SIPNEX if:

• You run predictive or progressive dialers with 20 to 500 agents.
• Short calls dominate your traffic, so 12/6 billing pays off.
• You want unlimited channels, no commits, and support that runs VICIdial.

Bottom line: Bandwidth wins on wholesale scale. Telnyx wins on developer tooling. SIPNEX wins on dialer economics. (Comparing the SMB tier instead? The sister matchup is Flowroute vs Telnyx vs SIPNEX.) For high-volume US outbound, billing increments often decide it: SIPNEX bills 12/6 (6-second steps after a 12-second minimum), Telnyx bills in 60-second blocks, and Bandwidth makes you ask sales.

One more tiebreaker: answer rate. All three can sign calls at A-level. But SIPNEX is the only one whose support team actively helps operators manage caller ID strategy — see our guide to CID reputation management.

Frequently asked questions

How do Bandwidth, Telnyx, and SIPNEX pricing models differ?

Bandwidth prices through enterprise sales: rates are unpublished, minimum commits are common, and the deals get sharp at very high volume (5M+ minutes). Telnyx publishes rates, but 60-second billing and possible per-channel fees add cost at high concurrency. SIPNEX publishes wholesale per-minute tiers with no per-channel or platform fees, so total cost is easy to work out. At 500,000+ minutes per month of US domestic outbound, SIPNEX and Bandwidth typically land the most competitive.

Do all three provide A-level STIR/SHAKEN attestation?

Yes. All three hold their own STIR/SHAKEN certificates and can sign at A-level for numbers on their platforms. For standard use, attestation quality is equal across the three. The difference shows in edge cases — ported numbers, third-party DIDs, complex setups — and in the support you get when signing breaks. SIPNEX treats attestation support as a core job, not a side feature.

Can I switch between these carriers easily?

Yes. All three use standard SIP, so switching means changing SIP credentials in your PBX, porting your numbers, and testing before full cutover. Under FCC rules, simple ports complete in one business day; complex ports get up to four business days, and messy ones can run longer. You can run both carriers during the move — old carrier for numbers still porting, new one for fresh DIDs. Standard SIP means no lock-in.

Does Telnyx use 6-second or 60-second billing?

Per Telnyx’s published billing documentation, voice calls bill in 60-second increments (60/60), with 6-second billing no longer offered — so an 11-second call is billed as 60 seconds. Bandwidth uses 6-second billing but sets rates through enterprise contracts. SIPNEX bills US outbound 12/6 — 6-second increments after a 12-second minimum — which tracks short dialer calls far more closely.

Which carrier is cheapest for short outbound calls?

For short calls, the billing increment matters more than the per-minute rate. A 10-second call costs a full minute on 60/60 billing but only 12 seconds’ worth on a 12/6 card — an 80 percent gap on the same call. SIPNEX bills 12/6, so it usually wins on short-call traffic like predictive dialing. Model your real average call length before you pick.

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SIPNEX is the carrier built for operators. Unlimited channels, A-level STIR/SHAKEN, published wholesale rates, and support from people who run VICIdial. Test us against your current carrier or see the rate card.