Best Asterisk Alternatives in 2026
15 voice APIs our editors would look at instead of Asterisk, in our ranking order.
Asterisk: A free Linux framework for building SIP, PBX, VoIP, and conferencing systems. Where it falls short: runs on linux rather than across multiple listed platforms.
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Twilio Programmable Voice not yet scored
Best forBroad, programmable voice deployments
A broad voice API for calling, IVR, SIP, recording, conferencing, and SDK-based apps.
- SIP support
- Call recording
- Phone number support
—not yet scoredVisit Twilio -
Vonage Voice API not yet scored
Best forFull-featured voice and AI call workflows
A broad voice API for building PSTN, SIP, WebRTC, IVR, and AI call workflows.
- SIP support
- Call recording
- Phone number support
—not yet scoredVisit Vonage -
Best forBusinesses connecting SIP infrastructure to PSTN
A focused SIP-to-PSTN service with secure trunking and pay-as-you-go voice charges.
2.6/10★☆☆☆☆Visit Twilio -
Bandwidth Voice API not yet scored
Best forMature PSTN voice and media streaming projects
A broad PSTN voice API for calling, media control, transcription, and AI streaming.
- SIP support
- Call recording
- Phone number support
—not yet scoredVisit Bandwidth -
Infobip Voice API not yet scored
Best forTeams wanting a long trial and broad voice tools
A broad voice API suite with a 60-day trial and pay-as-you-go pricing.
- SIP support
- Call recording
- Phone number support
—not yet scoredVisit Infobip -
Best forTeams building call workflows around RingCentral
A RingEX-included voice API for building call workflows across WebRTC, SIP and REST.
- SIP support
- Call recording
- Phone number support
7.8/10★★★★☆Visit RingCentral -
Microsoft Azure Communication Services Call Automation not yet scored
Best forAzure teams automating calls with event workflows
A capable Azure voice API for event-driven call automation with usage-based pricing.
- Call recording
- Phone number support
- Outbound calling
—not yet scoredVisit Azure -
Best forDevelopers needing SIP and streaming voice
A developer-focused Voice API for inbound, outbound, SIP and streaming calls.
- SIP support
- Call recording
- Phone number support
7.6/10★★★★☆Visit Plivo -
Best forAWS developers adding PSTN call flows
A focused AWS building block for developers creating programmable PSTN call flows.
- SIP support
- Call recording
- Phone number support
8.0/10★★★★☆Visit AWS -
Best forAWS users connecting existing PBX infrastructure
A focused voice connector for PBX-to-PSTN calling within the AWS ecosystem.
- SIP support
- Call recording
- Phone number support
8.0/10★★★★☆Visit AWS -
Best forOpen-source teams building self-hosted voice systems
A self-hosted, open-source foundation for teams building programmable voice systems.
- SIP support
- Call recording
- Outbound calling
7.8/10★★★★☆Visit FreeSWITCH -
Orange Voice API not yet scored
Best forBusinesses needing scenario-based voice automation
A scenario-focused voice API for businesses building custom calling workflows.
- Call recording
- Phone number support
- Outbound calling
—not yet scoredContact Orange -
8x8 CPaaS Voice not yet scored
Best forMid-market and enterprise app-integrated voice workflows
A cloud voice API for teams embedding inbound and outbound calling in applications.
- Call recording
- Phone number support
- Outbound calling
—not yet scoredVisit 8x8 -
Sinch Voice API not yet scored
Best forDevelopers wanting low-cost API voice basics
A focused API for programmable calling, SIP, IVR, and voice workflows.
- SIP support
- Call recording
- Phone number support
—not yet scoredVisit Sinch -
Kaleyra Voice API not yet scored
Best forTeams needing simple IVR and call masking
A focused voice API for IVR, calling workflows, recording, and call masking.
- Call recording
- Phone number support
- Outbound calling
—not yet scoredVisit Kaleyra
Asterisk Alternatives: Common Questions
What is the best alternative to Asterisk?
Twilio Elastic SIP Trunking: #3 in our Voice APIs ranking, with an editor score of 2.6 out of 10. A focused SIP-to-PSTN service with secure trunking and pay-as-you-go voice charges.
Is there a free alternative to Asterisk?
Yes. FreeSWITCH has a free plan or a free tier.
Asterisk vs Each Alternative
| # | Tool | Free plan | Paid from | Inbound calling | Outbound calling | Phone number support | SIP support | Score |
|---|---|---|---|---|---|---|---|---|
| not scored | Asterisk | Yes | None | Yes | Yes | — | Yes | — |
| not scored | Twilio Programmable Voice | No | — | Yes | Yes | Yes | Yes | — |
| not scored | Vonage Voice API | No | — | Yes | Yes | Yes | Yes | — |
| 3 | Twilio Elastic SIP Trunking | No | — | — | — | — | — | 2.6 |
| not scored | Bandwidth Voice API | No | — | Yes | Yes | Yes | Yes | — |
| not scored | Infobip Voice API | No | — | Yes | Yes | Yes | Yes | — |
| 6 | RingCentral Voice API | No | — | Yes | Yes | Yes | Yes | 7.8 |
| not scored | Microsoft Azure Communication Services Call Automation | No | — | Yes | Yes | Yes | — | — |
| 8 | Plivo Voice API | No | — | Yes | Yes | Yes | Yes | 7.6 |
| 9 | Amazon Chime SDK PSTN Audio | No | — | Yes | Yes | Yes | Yes | 8.0 |
| 10 | Amazon Chime SDK Voice Connector | No | — | Yes | Yes | Yes | Yes | 8.0 |
| 11 | FreeSWITCH | Yes | None | Yes | Yes | — | Yes | 7.8 |
| not scored | Orange Voice API | — | — | Yes | Yes | Yes | — | — |
| not scored | 8x8 CPaaS Voice | No | — | Yes | Yes | Yes | — | — |
| not scored | Sinch Voice API | No | — | Yes | Yes | Yes | Yes | — |
| not scored | Kaleyra Voice API | — | — | Yes | Yes | Yes | — | — |
Guides on Voice APIs
Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026