Wholesale VoIP. Direct from the carrier.
Volume-tiered voice termination, wholesale SIP trunking, and bulk DIDs from an FCC-licensed carrier. No middleman markup. A-level STIR/SHAKEN at every tier. White-label ready. No long-term contract.
What is wholesale VoIP?
Wholesale VoIP is voice service sold at carrier volume rates: per-minute termination, SIP trunk capacity, and phone numbers bought in bulk by businesses that resell voice or run heavy call volume.
SIPNEX is an FCC-licensed wholesale VoIP carrier. We hold direct authorization, sign with our own STIR/SHAKEN certificate, and sell from our own IP network. What you buy from us is the network itself, not a markup on someone else's.
The buyers are operators, not end users. VoIP resellers packaging trunks and numbers under their own brand. ITSPs building a retail VoIP service that needs a termination layer underneath. CLECs that need off-net termination beyond their own footprint. MSPs bundling voice into managed IT contracts. Call centers pushing enough monthly minutes that retail per-seat pricing stops making sense. Different businesses, same requirement: carrier economics, measured in fractions of a cent per minute.
The economics are blunt. Retail voice is priced per seat, per channel, or per feature bundle, with margin baked into every layer. Wholesale voice is priced per minute, in 12/6 increments, at a rate that drops as your volume climbs. Once you pass a few hundred thousand minutes a month, that spread decides everything. It is the difference between a VoIP business with margin and one without.
Here is the problem with most of this market: the wholesale label gets applied to anyone with a rate deck. A large share of wholesale voice offers come from resellers buying from aggregators who buy from carriers. Every layer in that chain adds margin to your per-minute rate. Each one adds a signaling hop to your post-dial delay. And each one pushes your STIR/SHAKEN attestation further from the certificate that signs the call. When your upstream's upstream has a routing problem, you find out from your customers.
Carrier-direct removes the chain. SIPNEX holds direct FCC authorization — not a reseller deal. We file our own FCC Form 499. We sign every call with our own SP-KI certificate. That is why A-level attestation applies to every trunk at every volume tier. We are registered in the Robocall Mitigation Database and registered as a RespOrg for toll-free.
Rates are volume-tiered and published on the pricing page, billed 12/6 — 6-second increments after a 12-second minimum. Tier assignment is automatic from your actual monthly usage. No long-term contract, no setup fees, no per-channel fees. That is the difference between a VoIP wholesale carrier and a reseller with a spreadsheet.
Wholesale vs. retail VoIP
| WHOLESALE | RETAIL | |
|---|---|---|
| Who buys it | Resellers, ITSPs, CLECs, MSPs, high-volume call centers | End-user businesses buying phone service for staff |
| Pricing unit | Per minute, billed 12/6 | Per seat or per feature bundle |
| Contract shape | Month-to-month; tiers follow usage | Per-seat subscription, often on a term |
| Carrier relationship | Yours — direct with the carrier | Held by your provider, not by you |
| Who signs STIR/SHAKEN | The carrier whose certificate signs your traffic | Whoever sits upstream of your provider |
| Support path | Carrier NOC, one hop | Provider help desk, then their upstream |
If you sell voice, you live in both columns. You buy the left one and sell the right one. The gap between them is your margin — which is why the carrier you pick matters more than the logo on your invoice.
Volume-Tiered Pricing
Wholesale rates that fall as volume rises — $0.025-$0.030/min at entry tier down to $0.005-$0.008/min at 10M+ minutes. 12/6 billing increments. Published tiers, no quote gate.
FCC-Licensed Carrier
Buy from the carrier, not from another reseller. SIPNEX holds its own FCC license, 499 filing, STIR/SHAKEN certificate, and RMD registration. Your wholesale relationship is with the infrastructure owner.
A-Level Attestation Included
Every call on every wholesale trunk receives A-level STIR/SHAKEN attestation, signed with our own SP-KI certificate. No attestation upsell. No B-level default. Included at every volume tier.
White-Label Capability
Resell SIPNEX carrier capacity under your own brand. Your customers see your company, your rates, your support. We provide the invisible infrastructure underneath.
Nationwide DID Inventory
US DIDs across all area codes with same-day provisioning for most orders. Volume discounts on bulk purchases. CNAM registration and A-level attestation included with every number.
No Long-Term Contract
No minimum term, no early-termination penalty, no setup fees, no porting fees, no per-channel fees. Volume tiers assigned automatically from actual monthly usage — scale without cutting a new deal.
Wholesale carrier services, defined.
Wholesale carrier services are the network building blocks a reseller, ITSP, or MSP buys from a licensed carrier instead of building in-house: voice termination, SIP trunking, DID inventory, toll-free routing, and A2P messaging. SIPNEX supplies the full stack of wholesale VoIP services from one carrier-grade network, one account, one rate structure.
Termination is the core product. Wholesale voice termination is per-minute delivery of your outbound calls to the PSTN at volume rates. It is the line item that dominates cost for any high-volume operation. SIPNEX routes calls to the PSTN with sub-3-second average PDD, native G.711u pass-through with G.729 fallback, and 12/6 billing increments. No transcoding tax, no rounding up to the next full minute. The core of the network is US termination; for international calling, we quote routes we can stand behind on request rather than publishing an A-Z deck we would have to broker.
Wholesale SIP trunking is the capacity layer — the trunks your platform registers against and pushes traffic through. SIPNEX trunks carry unlimited concurrent channels with no per-channel fees. A burst from 200 to 800 simultaneous calls is a traffic pattern, not a contract amendment. New trunks are provisioned in 24 hours.
Numbers are the inventory side — what carriers call VoIP origination. SIPNEX carries nationwide US DID inventory with CNAM registration included on every number. Same-day provisioning covers most orders, and bulk purchases earn volume discounts. Resellers stocking hundreds of numbers a month buy at wholesale, not per-number retail.
For 8XX traffic, SIPNEX is a registered RespOrg — we control toll-free number routing directly rather than brokering through a third party. That matters the day you need to move a customer's toll-free number or reroute traffic fast.
A2P SMS rides the same account, so text messaging on your DIDs does not require a second vendor. And if you are packaging all of this under your own brand, the SIPNEX VoIP reseller program is built for exactly that. White-label deals mean your customers see your brand and your rates while SIPNEX runs the carrier layer underneath. At 1M+ minutes per month, direct SIP peering is available to cut latency between your switch and ours.
How wholesale VoIP pricing works.
Wholesale voice pricing has one unit: the minute. You pay a per-minute rate on the traffic you send, and that rate falls as your monthly volume rises.
SIPNEX bills 12/6 — a 12-second minimum, then 6-second increments — so short calls cost what they should. Tier assignment is automatic: hit a higher volume band and the better rate applies on its own. The current tiers are published on the SIPNEX pricing page — no quote gate, no setup fees, no per-channel fees.
Retail VoIP flips the unit. End customers pay per seat or per feature bundle, not per minute — SIPNEX hosted extensions, for example, run $6.99/mo. That per-seat model is what resellers sell downstream while buying their underlying minutes at wholesale.
Reseller margin is the gap between those two models. Your margin is your retail price minus your wholesale per-minute cost. It widens when you bundle A2P SMS and value-added services on top of voice. The SIPNEX VoIP reseller program covers the white-label side. Our guide on how to become a VoIP reseller walks through the math.
How to choose a wholesale VoIP provider.
The wholesale VoIP providers in any search result look interchangeable on the surface — everyone claims great rates and great quality. The differences live in licensing paperwork, signing certificates, and contract fine print. This is the checklist we would use to evaluate any provider, including us.
The three kinds of wholesale VoIP providers
Every offer you will evaluate comes from one of three layers, and each layer down adds cost, delay, and distance from the certificate that signs your calls. The table below tells you which layer you are actually talking to.
| LICENSED CARRIER (OWN NETWORK) | AGGREGATOR | VOIP WHOLESALER | |
|---|---|---|---|
| Network ownership | Owns and runs its own switches | Blends routes from several carriers | Rents everything from upstream |
| FCC authorization | Direct — its own license and Form 499 | Varies by operator | Usually rides on someone else's |
| Who signs attestation | Its own STIR/SHAKEN certificate | Its upstream carriers | Two or more layers up |
| Rate stability | Set by network cost — stable | Shifts as routes are arbitraged | Tracks its supplier, plus margin |
| Added PDD hops | None | One | Two or more |
| Where SIPNEX sits | Here — carrier-direct | — | — |
- Licensing depth. Ask whether the provider holds direct FCC authorization or operates under someone else's. Ask for their FCC Form 499 filer status and Robocall Mitigation Database registration. A carrier answers in one sentence; a middleman changes the subject. SIPNEX holds direct authorization, files its own Form 499, and is RMD-registered.
- Attestation ownership. Who signs your calls? A provider with its own STIR/SHAKEN SP-KI certificate controls attestation on its own authority. A reseller inherits whatever its upstream signs — and B-level attestation quietly erodes answer rates. SIPNEX signs directly and applies A-level attestation on all trunks at every tier.
- Rate transparency. Published volume tiers beat quote-gated rate decks. Check the billing increment — per-second-class billing (6/6 or 12/6) versus 60-second rounding changes real cost on short-duration traffic. SIPNEX publishes its tiers, from $0.025-$0.030/min at entry volume down to $0.005-$0.008/min at 10M+ minutes.
- Quality metrics. Ask for ASR and ACD on the specific routes you send, not network-wide averages. Ask what post-dial delay looks like under load. SIPNEX runs sub-3-second average PDD. A provider unwilling to discuss route-level performance is telling you something.
- Interop and codecs. Confirm native codec pass-through before you commit. SIPNEX passes G.711u natively with G.729 fallback — no forced transcoding. We interop with VICIdial, Asterisk, FreeSWITCH, and standard SIP platforms without exotic configuration.
- Contract terms. Month-to-month should be the default, not a concession. Look for setup fees, porting fees, per-channel fees, platform fees, and early-termination penalties — SIPNEX charges none of them. Volume tier movement should be automatic from usage, not a deal you reopen each year.
- Provisioning speed. A carrier that controls its own network turns up trunks in 24 hours and provisions most DIDs same-day. Multi-week onboarding usually means your provider is waiting on their provider.
How to test a wholesale VoIP provider
Run the checklist against any wholesale voice provider before you move traffic. Better yet, run it during a live trial:
- Provision a trunk. SIPNEX turns up new trunks in 24 hours, so the test costs you an afternoon, not a quarter.
- Send a slice of production traffic. Real routes and real callers, not a lab script — quality only shows under real load.
- Watch ASR, ACD, and PDD in real time from your own switch. Your numbers, not the provider's dashboard, are the ones that count.
- Compare invoices at 6-second granularity. Check that billed duration matches what your switch logged, line by line.
If the numbers hold, move volume — tier pricing follows your usage automatically. There is no rate to lock and no term to sign. The tier follows the traffic.
Bottom line
Buy wholesale VoIP from the layer that owns the network. Everything below that layer is margin you are paying and control you are giving up.
Frequently asked questions.
What is wholesale VoIP?
Who is wholesale VoIP for?
What volume tiers do you offer?
Can I resell SIPNEX trunks to my customers?
Do wholesale trunks get A-level STIR/SHAKEN?
What about DID provisioning at wholesale?
Do you offer direct peering?
What are the contract terms?
What are wholesale carrier services?
How is wholesale VoIP different from buying from a VoIP reseller?
What does wholesale VoIP cost?
How do I test a wholesale VoIP provider before moving traffic?
Can I bundle A2P SMS with wholesale voice on one account?
Wholesale VoIP from the carrier.
Not from a reseller of a reseller. From the carrier.