SIP Trunking Pricing in 2026: Rates, Hidden Fees and What You Will Actually Pay

Quick answer: what does SIP trunking cost?

In the US, SIP trunking costs roughly $0.005 to $0.014 per minute for outbound calls, $0.003 to $0.009 per minute for inbound calls, and about $1 per month per phone number when billed pay-as-you-go. Channel-based plans cost about $20 to $50 per concurrent call path per month, usually with a bundle of minutes. A 25-seat office making 20,000 minutes of calls a month therefore pays around $120 to $300 a month on per-minute pricing, compared with $400 to $700 for a PRI circuit plus long distance. Signalmash's published rate is $0.0068 per minute outbound and $0.0053 inbound with no channel fees up to 10 calls per second.

This article is part of the Signalmash SIP trunking resource series: what SIP trunking is, the best providers in 2026, what it costs, wholesale SIP for resellers and Twilio Elastic SIP alternatives.

SIP trunking pricing is genuinely cheap, but the pricing pages are designed to make comparison hard: one provider quotes per minute, another per channel, a third per seat, and the fees that matter (E911, CNAM, toll-free inbound, channel bursts) are on a different page. This guide lays out every line item, compares published rates, and works through three real cost examples.

The two billing models

Per-minute (usage-based)

You pay for the minutes you use, billed in 6-second or 1-second increments, plus a small monthly fee per number. There is no cap on concurrent calls other than a calls-per-second limit. This is the model used by Signalmash, Telnyx, Twilio, Bandwidth, Plivo and SignalWire, and it is almost always cheaper for businesses with normal calling patterns.

Per-channel (concurrent-call)

You buy a number of simultaneous call paths at a fixed monthly price, typically $20 to $50 per channel, sometimes with unlimited US calling included. It was designed to mimic PRI pricing for buyers who wanted a predictable bill. It is worth it only when you use each channel heavily every day; for most offices half the channels sit idle and you are paying for capacity you do not use.

Every line item on a SIP invoice

• Outbound (termination) minutes to the lower 48 states, with separate higher rates for Alaska, Hawaii and "high cost" rural exchanges.
• Inbound (origination) minutes to your local numbers, and a higher rate for inbound toll-free calls because you, not the caller, pay for those.
• Outbound toll-free minutes, usually the cheapest rate on the sheet.
• Phone number rental per month, local and toll-free; short codes are a separate product.
• Channel or capacity fees: some providers charge nothing up to a base calls-per-second (CPS) rate and a monthly fee above it; others sell channel packs.
• E911: often $0.75 to $1.50 per number per month, mandatory for every device that can dial out.
• CNAM (caller name) lookups on inbound calls, fractions of a cent each; outbound CNAM registration is sometimes free.
• Call recording and storage, per minute and per month.
• Porting fees, usually free or a few dollars per number.
• Minimum monthly spend on discounted tiers.

Published US rates compared (2026)

Provider	Outbound US 48	Inbound local	Inbound toll-free	Outbound toll-free	Number/month	Channel fees
Signalmash (Launch)	$0.0068	$0.0053	$0.0165	$0.0018	$0.95	None up to 10 CPS; $375/mo for 10–25 CPS
Signalmash (Scale)	lower tiered	$0.0046	$0.0120	$0.0011	$0.50	Same
Telnyx	$0.005	$0.0032	varies	varies	$1.00	None listed
Twilio Elastic SIP	$0.0100	$0.0034	$0.0130	$0.0011	$1.15	None (unlimited concurrent calls)
Bandwidth	~$0.0035–0.008	~$0.0050	contract	contract	$0.50–1.50	Contract
Plivo	~$0.0055	~$0.0055	varies	varies	$0.80	None listed
Vonage	~$0.0139	~$0.009	varies	varies	$1.50	None listed

Rates quoted are publicly listed US pay-as-you-go prices as of September 2026; every provider changes prices and offers committed-use discounts, so confirm on the provider's pricing page before you decide.

Three worked examples

Example 1: 25-person professional office

10,000 outbound minutes, 8,000 inbound minutes, 30 numbers. At Signalmash Launch rates: $68 + $42.40 + $28.50 = about $139 a month. On Twilio list rates: $100 + $27.20 + $34.50 = about $162. On a 10-channel plan at $30 per channel: $300 regardless of usage. A PRI with long distance: $450 to $700.

Example 2: 100-seat outbound contact center

400,000 outbound minutes, 40,000 inbound, 200 numbers for local presence, peaks of 20 calls per second. Signalmash: $2,720 + $212 + $190 + $375 channel fee for 10–25 CPS = about $3,500 a month; the Growth or Scale tier lowers the per-minute rates further. Twilio list: $4,000 + $136 + $230 = about $4,370. Per-channel plans rarely make sense at this scale because bursts would require buying 150+ channels.

Example 3: inbound support line on toll-free

60,000 inbound toll-free minutes, 5 toll-free numbers. Toll-free inbound is the expensive direction: Signalmash Launch $990, Scale tier $720; Twilio $780. If most callers are on mobiles, publishing a local number alongside the toll-free one cuts the bill by two thirds.

Hidden costs to check before signing

• Rounding. 60-second billing increments add 10 to 15% to a bill of short calls compared with 6-second increments.
• High-cost zones. Calls to some rural exchanges cost 5 to 10 times the standard rate; ask for the rate deck, not the headline number.
• Inbound toll-free. Often three times the local inbound rate.
• Support plans. Twilio and others charge a percentage of spend for support beyond email; Signalmash includes engineer support in the rate.
• Contract minimums and auto-renewals on discounted tiers.
• Fraud exposure. An unsecured trunk with no spend cap can generate a five-figure international bill in a weekend. Set caps and geographic restrictions on day one.

How to lower your SIP trunking bill

1. Move from per-channel to per-minute pricing unless every channel is busy all day.
2. Use local numbers rather than toll-free for callback and support where possible.
3. Ask for the committed-use tier once you know your monthly volume; Signalmash's Growth ($100 minimum) and Scale ($1,000 minimum) tiers lower every rate on the sheet.
4. Use G.729 or Opus where the PBX supports it to cut bandwidth costs, which are often larger than the trunk cost.
5. Consolidate numbers you no longer use; at $1 each, 300 forgotten DIDs is $3,600 a year.

Signalmash SIP trunking pricing

Every Signalmash rate is on the public pricing page: no quote required, no channel packs, no platform fee, no support fee, and a Launch plan with no monthly minimum so you can test with real traffic. Pricing drops automatically at the Growth and Scale tiers.

Talk to a Signalmash voice engineer about your call volumes, PBX and number inventory, and we will quote a SIP trunk with the exact per-minute rates you will pay.

People also ask

How much does a SIP trunk cost per month?

On per-minute pricing a small office typically spends $100 to $300 a month including numbers; a 100-seat contact center spends $3,000 to $5,000. Per-channel plans cost $20 to $50 per concurrent call path per month. Signalmash lists $0.0068 per minute outbound, $0.0053 inbound and $0.95 per number with no monthly minimum.

Is SIP trunking cheaper than PRI?

Yes, usually by 40 to 70 percent. A PRI costs $400 to $700 a month for 23 channels plus long-distance charges; the same traffic on SIP trunking costs $100 to $300 at per-minute rates, with no circuit rental and no fixed channel limit.

What is the cheapest way to buy SIP trunking?

Pay-as-you-go per-minute pricing from a provider that owns its routes, with local rather than toll-free numbers and a committed-use tier once your volume is stable. Avoid per-channel bundles unless every channel is in constant use, and check billing increments and high-cost-zone rates before comparing headline prices.

Are there setup fees for SIP trunking?

Most modern providers, including Signalmash, Telnyx and Twilio, charge no setup fee for standard SIP trunks. Number porting is usually free or a few dollars per number. Fees appear for short codes, dedicated interconnects and enterprise onboarding.