Twilio Cost Savings Calculator
Twilio gets expensive as your call volume grows. Moving to Managed ProSBC with your own SIP trunk can save you thousands of dollars a month.
Is this the right comparison for you? It covers voice calls only. Twilio handles SMS and your own voice path doesn’t, so if you send SMS, that part of your bill isn’t included here. If you need phone numbers in a dozen countries from day one, you’re paying for international coverage as well as voice minutes, and this page doesn’t price that. And if your call volume is low, the fixed monthly cost won’t pay for itself yet, so staying on Twilio until your volume grows is often the better choice.
The calculator uses typical values for everything except your minutes and your Twilio product. Calls average 90 seconds and split evenly between inbound and outbound. On Twilio, you’re recording calls, keeping the recordings for a year and using Voice Insights Advanced. Together those add $0.0109 a minute to the voice rate: $0.0025 for recording, $0.0060 for storage and $0.0024 for Insights. Twilio also rounds every call leg up to a full minute, so a 90-second call is billed as two minutes. The SIP trunk uses Flowroute’s published flat rate of $0.00833 outbound and $0.0050 inbound, self-serve with no volume commitment, billed in six-second increments outbound and whole minutes inbound. These are retail rates and a wholesale contract costs less, so if anything the saving shown here is on the low side. For ProSBC, we use the published Managed Service starting price of $600 a month. Your actual price depends on the capacity you need.
$10,418 a month cheaper on Managed ProSBC
Switch to Managed ProSBC + SIP Trunking
| Path | Monthly cost | Against Twilio |
|---|---|---|
| Twilio Programmable Voice | $14,767/mo | – |
| Managed ProSBC + SIP trunk (we run it) | $4,349/mo | $10,418 saved |
The link saves your minutes and Twilio product, so anyone who opens it sees the same result. Print opens a one-page summary of your inputs, the result and the assumptions behind it, which you can also save as a PDF.
Why Twilio gets expensive
- Add-ons are charged per minute. Recording costs $0.0025 a minute and Voice Insights Advanced another $0.0024. Storage is the one that’s easy to miss: it costs $0.0005 per stored minute per month, and you pay it again every month until you delete the file. Real-time media streaming adds $0.0044, and Twilio’s own streaming transcription $0.027. Add up a typical production setup and the voice rate roughly doubles.
- Rounding adds to every call. Twilio rounds each call leg up to a full minute, so in Twilio’s own example a call of 1 minute 20 seconds is billed as 2 minutes. Several carriers bill in six-second increments instead. On three-minute calls the difference disappears, but on 30-second calls from an AI agent, rounding to the minute doubles your bill compared with the same published rate. That’s why it’s worth checking the billing increment before you compare prices. It varies by provider: Flowroute bills outbound calls in six-second increments and inbound calls by the minute, and Telnyx dropped six-second billing in favour of rounding to the minute.
Neither of these shows up on a rate card, so your own invoice is the best place to check. Our Twilio at scale analysis walks through the same calculation in more detail, including a growth projection this calculator doesn’t cover.
Prepare to scale with Managed ProSBC + SIP Trunking
With Twilio, you rent capacity by the minute. You start at zero and pay for every minute you use, for as long as you stay. Managed ProSBC with your own SIP trunk works more like owning: you pay a fixed monthly cost for the capacity, and every call that runs through it then costs far less.
At low volume that trade doesn’t pay off, but it gets better as you grow. The $600 stays the same whether you run fifty thousand minutes or five hundred thousand, so your cost per call falls as you scale and your margin improves. On a fully per-minute bill your cost per call never falls, because each new customer comes with the same unit cost as the last. The calculator above shows which side of the break-even point you’re on.
If you’re close to break-even and growing, the total cost of ownership view is more useful than this month’s invoice, which only shows where you are today.
More control over your voice infrastructure
Once the SBC sits at your network edge, you choose which carrier handles each route, and switching carriers later is a configuration change.
- Custom routing lets you decide where calls go, by destination, by customer or by time of day.
- With backup SIP providers, calls have somewhere to go if a carrier fails. Add a second or third carrier, and a problem at one of them doesn’t take your service down.
- Least-cost routing sends each call to the cheapest carrier for that destination. On one route the saving is small, but across thirty routes it adds up.
- Quality-based routing chooses carriers by measured call quality, which is worth using on routes where a dropped call costs you more than a cent.
- Header and codec control makes the other four possible. Carriers rarely handle SIP details the same way, so something has to reconcile them on every call leg. The SBC does that for you, so you don’t have to do it by hand.
All five come standard with ProSBC. With Managed Service, we configure and run them for you, so you get the control without hiring a voice engineer.
You don’t have to switch all at once
You can keep Twilio while you move. Put your own SBC at the edge and choose your carriers from there, with a CPaaS trunk as one of them. Keep Twilio for the routes and countries where its rate is fair, send high-volume domestic traffic to a trunk you buy directly, and let the SBC pick the route for each call. This setup is called bring your own carrier, and it’s a much smaller first step than a full cutover. You can move one route at a time and move back any that cause problems.
Monthly minutes and concurrent calls are different measures, and the difference matters once you move from a rough comparison to sizing. ProSBC is priced on concurrent calls, and you can only work out concurrency from monthly minutes if you know how your traffic peaks. Two businesses with the same monthly total can need very different session counts. The SIP trunk sizing calculator works this out with Erlang B, the bandwidth calculator shows how much bandwidth that many channels need, and ProSBC pricing gives you the monthly price for the tier you need.
Where every number comes from
You should be able to check any cost comparison, so here is the full model. We re-checked every default on 2026-09-18. When a number is published, the row links to the page it came from. When a number is our own assumption, the row says so, so you know which ones to check against your own situation. Of the 22 inputs, 15 come from a published page, 1 is partly published and partly our assumption, and 4 are our own assumptions with no published source.
| Input | Default | Unit | Where the default comes from | What it moves |
|---|---|---|---|---|
| Talk minutes per monthnot a rate | 500,000 | minutes | Reader input. The slider default only, chosen to sit mid-range on a logarithmic 10,000 to 10,000,000 scale. No external source and none needed. | Both sides of the comparison |
| Twilio productverified | Programmable Voice | selection | Reader input. Selects which published rate pair applies, https://www.twilio.com/en-us/voice/pricing/us or https://www.twilio.com/en-us/sip-trunking/pricing/us, verified 2026-09-18. | Twilio side |
| Programmable Voice outbound rateverified | 0.0140 | USD per minute | Published rate, https://www.twilio.com/en-us/voice/pricing/us, verified 2026-09-18 | Twilio side |
| Programmable Voice inbound rateverified | 0.0085 | USD per minute | Published rate, https://www.twilio.com/en-us/voice/pricing/us, verified 2026-09-18 | Twilio side |
| Elastic SIP Trunking outbound rateverified | 0.0100 | USD per minute | Published rate, https://www.twilio.com/en-us/sip-trunking/pricing/us, verified 2026-09-18 (United States 48 states, Zone 1) | Twilio side |
| Elastic SIP Trunking inbound rateverified | 0.0034 | USD per minute | Published rate, https://www.twilio.com/en-us/sip-trunking/pricing/us, verified 2026-09-18 (local origination) | Twilio side |
| Call recording add-onverified | 0.0025 | USD per minute | Published rate, https://www.twilio.com/en-us/voice/pricing/us, verified 2026-09-18 | Twilio side |
| Recording storage add-onpartial | 0.0060 | USD per minute | Derived. The published rate is 0.0005 per stored minute per month, https://www.twilio.com/en-us/voice/pricing/us, verified 2026-09-18. The 12-month retention that turns it into 0.0060 is a TelcoBridges assumption and is not published. Twilio’s changelog entry of 2026-09-17, Voice Recording Storage billing updates, states the price is unchanged but that metered daily usage may move. The model has not been changed for it, and it will be re-checked at the next refresh. | Twilio side |
| Voice Insights Advanced add-onverified | 0.0024 | USD per minute | Published rate, https://www.twilio.com/en-us/voice/pricing/us, verified 2026-09-18 | Twilio side |
| Media streams add-onverified | 0.0044 | USD per minute | Published rate, https://www.twilio.com/en-us/voice/pricing/us, verified 2026-09-18. Named on the page as a cost readers often miss; it is not in the modelled add-on stack. | Nothing. Discussed, not calculated. |
| Twilio billing incrementverified | 60 | seconds | Published, https://help.twilio.com/articles/223132307, verified 2026-09-18, verbatim: any partial minutes (under 60 seconds) are rounded up to the next full minute. | Twilio side |
| Average call durationours, not published | 90 | seconds | Not published anywhere. TelcoBridges assumption: a round mid-range figure. It drives both rounding factors, so it is the single assumption most likely to be wrong for a given reader. Short AI-agent calls make the Twilio side worse; long human calls make it better. | Both sides, through the rounding factors |
| Outbound share of minutesours, not published | 0.5 | share of total | Not published anywhere. TelcoBridges assumption: an even inbound/outbound split. A reader whose traffic is mostly inbound sees a different blended rate on both sides. | Both sides |
| SIP trunk outbound rateverified | 0.00833 | USD per minute | Published rate, https://www.flowroute.com/pricing-details/, verified 2026-09-18. Flowroute flat self-serve retail, no volume commitment. A wholesale contract goes lower, so the modelled saving is if anything understated. | Owned-path side |
| SIP trunk inbound rateverified | 0.0050 | USD per minute | Published rate, https://www.flowroute.com/pricing-details/, verified 2026-09-18 | Owned-path side |
| SIP trunk outbound incrementverified | 6 | seconds | Published, https://developer.flowroute.com/api/glossary/, verified 2026-09-18. | Owned-path side |
| SIP trunk inbound incrementverified | 60 | seconds | Published, https://developer.flowroute.com/api/glossary/, verified 2026-09-18. Flowroute rounds inbound to the minute, the same as Twilio, so the increment advantage is outbound only. | Owned-path side |
| Managed ProSBC monthly feeverified | 600 | USD per month | Published starting price, https://telcobridges.com/pricing/, verified 2026-09-18, shown on the page as STARTING AT $600/mo with the note that price depends on capacity requirements. | Owned-path side |
| Session tier assumed by that feeours, not published | 500 | concurrent sessions | Not published. https://telcobridges.com/pricing/ states only that price depends on capacity requirements and gives no session count for the starting price, checked 2026-09-18. The 500 figure is a TelcoBridges working assumption. | Nothing. It is a footnote trigger only and never enters the arithmetic. |
| Volume above which the starting rate understates a quoteours, not published | 4,000,000 | minutes per month | Not published anywhere. TelcoBridges assumption: a deliberately rough heuristic for when 500 concurrent sessions is unlikely to be enough. It triggers a caveat on the page and never changes a price. | Nothing. Footnote trigger only. |
| USF and regulatory pass-throughnot a rate | excluded | percent of assessable spend | Deliberately excluded from both sides. It is a material charge on the Twilio side, but SIP carriers pass comparable fees through without publishing them, so charging one side and not the other would bias the result. Excluding both is the least wrong option available. | Neither side |
| Contract termverified | monthly, no commitment | term | Both sides are month-to-month self-serve list pricing: https://telcobridges.com/pricing/ is billed monthly and the Flowroute rates at https://www.flowroute.com/pricing-details/ carry no volume commitment, both verified 2026-09-18. | Framing of the result, not the arithmetic |
Download the table as a CSV. We re-check these rates every 90 days, and right away if a provider announces a pricing change.
Cite or embed this table
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Get a quote sized to your traffic
The $600 above is where Managed Service starts, and your real price depends on the capacity you need. Tell us your monthly minutes and your busy hour, and we’ll size ProSBC for your traffic and quote the tier you land on.
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Frequently asked questions
Why is the Twilio number higher than the rate on Twilio’s pricing page?
The rate on Twilio’s pricing page covers the voice minute only, and two things push your actual bill higher. The first is add-ons: recording is $0.0025 a minute, recording storage is $0.0005 per stored minute per month until you delete the file, and Voice Insights Advanced is $0.0024. Together those roughly double the voice rate. The second is rounding, because every call leg is rounded up to a full minute, so a 90-second call is billed as two. Put the two together and your effective rate ends up well above the advertised one.
Where do the SIP trunk rates come from?
We use Flowroute’s published flat rates, which anyone can sign up for today. You can find cheaper. DIDforSale publishes $0.004 outbound on a no-commitment tier, and committing to volume gets you lower rates again. Be careful with prices advertised as “starting at”: Telnyx advertises $0.005 but prices by prefix, so what you pay depends on which numbers you call. We don’t quote a market average on purpose. The median across the nine public US rate cards is exactly one cent, the same as Twilio, which tells you more about which rate cards happen to be public than about what you can actually buy.
Do I have to leave Twilio completely?
No. Treating it as all or nothing is often what stalls these projects. Put the SBC at the edge and treat Twilio as one carrier among several. Keep it for the countries and routes where its rate is fair, and send high-volume domestic traffic to a SIP trunk. You get most of the saving without a full cutover, plus a backup path for the day a carrier has an outage.