Best SIP Trunking Providers in 2026
Updated
In short: Twilio Segment is ranked #1 of 30 as of 9 October 2026, ahead of Callcentric SIP Trunking and Bandwidth Messaging API. The best-ranked option with a free plan is Callcentric SIP Trunking. The lowest first paid tier on this page is BulkVS SIP Trunking at $0.01/mo.
Businesses comparing SIP trunking providers can weigh calling capacity, service features and pricing details against their phone system needs. Compare concurrent channels with emergency calling, encrypted signaling and number porting; toll-free number support adds another capability to check. Pricing model, free-plan availability and paid-from price offer further cost context. The entries include Twilio Segment, Callcentric SIP Trunking and Bandwidth Messaging API, as well as SIP.US Cloud SIP Trunking. Review the listed details in light of the calling volume you need to support, the number portability requirements you have, and how you prefer charges to be structured.
30 SIP trunking providers ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
30ranked
4free plans on this page
$0.01/molowest paid tier
9 Oct 2026last checked
Input list SIP Trunking Providers 25 channels on this page · 124 of 200 spec lines stated by the makers
Ch Tool Free planPaid fromPricing modelConcurrent channelsNumber portingEmergency callingToll-free numbersEncrypted signaling Spec sheet Score
01 Twilio Segment Free planNoPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 6/8spec lines stated 7.6
02 Callcentric SIP Trunking Free planYesPaid fromnot statedPricing modelper-minuteConcurrent channels3 channelsNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingNo 7/8spec lines stated 7.5
03 Bandwidth Messaging API Free planNoPaid fromnot statedPricing modelnot statedConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersnot statedEncrypted signalingYes 4/8spec lines stated 7.4
04 SIP.US Cloud SIP Trunking Free planNoPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 6/8spec lines stated 7.2
05 BulkVS SIP Trunking Free planNoPaid from$0.06/moPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingnot stated 6/8spec lines stated 7.0
06 Telnyx Text-to-Speech API Free planNoPaid fromnot statedPricing modelnot statedConcurrent channelsnot statedNumber portingnot statedEmergency callingnot statedToll-free numbersnot statedEncrypted signalingnot stated 1/8spec lines stated 6.9
07 Anveo Direct Free plannot statedPaid from$0.15/moPricing modelhybridConcurrent channels0 channelsNumber portingYesEmergency callingnot statedToll-free numbersYesEncrypted signalingnot stated 5/8spec lines stated 6.7
08 IPComms SIP Trunking Free planYesPaid from$1.5/moPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 7/8spec lines stated 6.7
09 SendFax.to Free planNoPaid from$17.99/moPricing modelhybridConcurrent channels1 channelsNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingnot stated 7/8spec lines stated 6.7
10 Telnyx SIP Trunking Free planNoPaid fromnot statedPricing modelnot statedConcurrent channelsnot statedNumber portingnot statedEmergency callingnot statedToll-free numbersnot statedEncrypted signalingnot stated 1/8spec lines stated 6.7
11 Sinch Fax API Free planNoPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 6/8spec lines stated 6.5
12 VoIP.ms SIP Trunking Free planNoPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 6/8spec lines stated 6.4
13 BT Global SIP Free plannot statedPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersnot statedEncrypted signalingYes 4/8spec lines stated 6.3
14 Callivex SIP Trunking Free plannot statedPaid fromnot statedPricing modelnot statedConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 4/8spec lines stated 6.3
15 Colt SIP Trunking Free plannot statedPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersnot statedEncrypted signalingYes 4/8spec lines stated 6.3
16 Dollu CCaaS Free planNoPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 6/8spec lines stated 6.3
17 Sangoma Carrier Voice Free plannot statedPaid fromnot statedPricing modelper-minuteConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingnot stated 4/8spec lines stated 6.3
18 AVOXI Global SIP Trunking Free planNoPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingnot statedToll-free numbersYesEncrypted signalingYes 5/8spec lines stated 6.2
19 Flowroute Free planNoPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 6/8spec lines stated 6.2
20 O2 Business SIP Trunking Free planNoPaid fromnot statedPricing modelper-minuteConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingnot stated 5/8spec lines stated 6.2
21 Orange Business Talk IP Free plannot statedPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingnot statedToll-free numbersnot statedEncrypted signalingnot stated 2/8spec lines stated 6.2
22 Skyetel SIP Trunking Free plannot statedPaid from$25/moPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 6/8spec lines stated 6.2
23 DIDWW Two-way SIP Trunking Free plannot statedPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 5/8spec lines stated 6.1
24 BICS SIP Trunking Free plannot statedPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 5/8spec lines stated 5.8
25 Twilio Elastic SIP Trunking Free planNoPaid fromnot statedPricing modelhybridConcurrent channelsnot statedNumber portingYesEmergency callingYesToll-free numbersYesEncrypted signalingYes 6/8spec lines stated 5.8
Compare all 25 in a table
| # | Tool | Score | Free plan | From | Free plan | Paid from | Pricing model | Concurrent channels |
|---|---|---|---|---|---|---|---|---|
| 1 | Twilio Segment | 7.6 | Free plan | $120/mo | No | — | hybrid | — |
| 2 | Callcentric SIP Trunking | 7.5 | Free plan | Free | Yes | — | per-minute | 3 channels |
| 3 | Bandwidth Messaging API | 7.4 | No | — | No | — | — | — |
| 4 | SIP.US Cloud SIP Trunking | 7.2 | No | $1/mo | No | — | hybrid | — |
| 5 | BulkVS SIP Trunking | 7.0 | No | $0.01/mo | No | 0.06 /mo | hybrid | — |
| 6 | Telnyx Text-to-Speech API | 6.9 | Free plan | $500/mo | No | — | — | — |
| 7 | Anveo Direct | 6.7 | No | — | — | 0.15 /mo | hybrid | 0 channels |
| 8 | IPComms SIP Trunking | 6.7 | No | — | Yes | 1.5 /mo | hybrid | — |
| 9 | SendFax.to | 6.7 | No | — | No | 17.99 /mo | hybrid | 1 channels |
| 10 | Telnyx SIP Trunking | 6.7 | Free plan | $500/mo | No | — | — | — |
| 11 | Sinch Fax API | 6.5 | No | — | No | — | hybrid | — |
| 12 | VoIP.ms SIP Trunking | 6.4 | No | $23/mo | No | — | hybrid | — |
| 13 | BT Global SIP | 6.3 | No | — | — | — | hybrid | — |
| 14 | Callivex SIP Trunking | 6.3 | No | — | — | — | — | — |
| 15 | Colt SIP Trunking | 6.3 | No | — | — | — | hybrid | — |
| 16 | Dollu CCaaS | 6.3 | No | — | No | — | hybrid | — |
| 17 | Sangoma Carrier Voice | 6.3 | No | — | — | — | per-minute | — |
| 18 | AVOXI Global SIP Trunking | 6.2 | No | $19.99/mo | No | — | hybrid | — |
| 19 | Flowroute | 6.2 | No | — | No | — | hybrid | — |
| 20 | O2 Business SIP Trunking | 6.2 | No | £1/mo | No | — | per-minute | — |
| 21 | Orange Business Talk IP | 6.2 | No | — | — | — | hybrid | — |
| 22 | Skyetel SIP Trunking | 6.2 | No | $25/mo | — | 25 /mo | hybrid | — |
| 23 | DIDWW Two-way SIP Trunking | 6.1 | No | — | — | — | hybrid | — |
| 24 | BICS SIP Trunking | 5.8 | No | — | — | — | hybrid | — |
| 25 | Twilio Elastic SIP Trunking | 5.8 | No | — | No | — | hybrid | — |
Is your tool on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which SIP trunking provider is ranked first on Specifiction?
Twilio Segment is ranked #1 of 30 with a score of 7.6. Callcentric SIP Trunking is second and Bandwidth Messaging API third.
How many of these have a free plan?
4 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, BulkVS SIP Trunking has the lowest first paid tier we found: $0.01/mo.
How is this list ranked?
Ranked on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.