Communication·Standings
Voice APIs
Voice APIs connect software to phone calls, so the choice turns on the calling features you need and where the service runs. Compare inbound and outbound calling, phone numbers, SIP, recording and concurrent-call limits.
Use the board's signal score out of 10 as a quick comparison. Check the API, open-source and free-tier marks, then review pricing, supported platforms and SDK languages for fit with your existing apps.
- 52 platforms
- 1 with a public API on this page
- 11 with a free tier
- Checked 23 Sept 2026
- 1 WP
Wazo Platformwazo-platform.orgWazo Platform is an open-source project for building carrier-grade programmable IP communication infrastructures.
- 2 YYateClientyate.ro
YateClient is an instant messenger and softphone based on Yate.
- 3 AC
Aculab Cloudaculab.comAculab Cloud provides APIs for voice and video calls, messaging, and inbound and outbound fax.
- 4 C
Callrcallr.comA paid voice and messaging platform with programmable calls, SMS, call tracking, and conversation AI.
- 5 TS
Telnyx SIP Trunkingtelnyx.comTelnyx provides carrier-operated SIP trunking for inbound and outbound PSTN calling over the internet.
- 6 F
FreeSWITCHsignalwire.comFree open-source framework routes calls, bridges video, converts media, and connects protocols.
- 7 IV
Infobip Voice APIinfobip.comPaid voice tools for mobile and web apps make calls across phone, browser, and SIP networks.
- 8 K
Kamailiokamailio.orgFree open-source SIP server for VoIP platforms, with modular tools for routing and registration.
- 9 DND7 Networksd7networks.com
A messaging service for worldwide SMS, WhatsApp, Viber, number lookup, and two-step verification.
- 10 PV
Plivo Voice APIplivo.comPaid API makes and receives calls over phone, SIP, and WebRTC, with recording and speech tools.
- 11 AAsteriskasterisk.org
A free, open-source phone system framework for Linux computers and self-hosted servers.
- 12 SI
SIP.IOsip.ioSIP.IO describes itself as an edge-native programmable voice and cloud contact center platform for UCaaS, CCaaS, and Voice AI.
- 13 AC
Amazon Chime SDK PSTN Audioaws.amazon.comA calling service that lets people join meetings by phone and records calls to Amazon S3.
- 14 4
46elks46elks.com46elks describes itself as a telecom API for applications to send SMS, receive MMS photos, and make automatic phone calls.
- 15 CA
CallFire APIdevelopers.callfire.comA REST API for voice and text messages, broadcasts, and event webhooks.
- 16 SIsipgate.iosipgate.io
Freemium web calling service supports inbound and outbound calls with phone numbers.
- 17 AC
Amazon Chime SDK Voice Connectordocs.aws.amazon.comA phone connection service linking an existing phone system with the public phone network and Chime meetings.
- 18 Ddrachtiodrachtio.org
A free Linux calling tool for inbound and outbound calls, SIP, and call recording.
- 19 FFonosterfonoster.com
Free web voice platform supports inbound and outbound calls, phone numbers, SIP, and recording.
- 20 Jjambonzjambonz.org
Free web calling platform supports inbound and outbound calls, phone numbers, SIP, and recording.
- 21 TV
Telnyx Voice APItelnyx.com - 22 OV
Orange Voice APIdeveloper.orange.comPaid API controls inbound and outbound calls, voice menus, media, transcription, and business integrations.
- 23 KVKaleyra Voice APItatacommunications.com
Paid API manages inbound and outbound calls with IVR, recording, masking, and CRM connections.
- 24 CVCommio Voice APIcommio.com
A voice API connecting to Twilio, SignalWire, and SIP systems for domestic and international calls.
- 25 EVEnableX Voice APIenablex.io
Paid voice API for inbound and outbound calls on Android, iOS, and web, with a 30-day trial.
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How to choose
Which platforms does it need to run on?
Choose a service that supports the environments your app uses, such as web, API, iOS, Android, Linux or self-hosted deployment.
Platform support differs across products. Amazon Chime SDK PSTN Audio lists Android, API, iOS, web and Windows support, while Bird Voice API lists web support.
Does it support the calling features you need?
Check inbound and outbound calling, phone-number support, SIP, call recording and the concurrent-call limit before choosing.
These fields show whether a service can handle your call flow and connection method.
What will the service cost to start?
Review the paid-from price, free-plan mark and trial terms together. Aculab Cloud has a free plan and free trial; Asterisk has a free plan; Apifonica Voice API lists a 30-day trial.
Published pricing varies: Amazon Chime SDK Voice Connector lists a starting price of $0.00, Azure Communication Services SMS starts at $1 per month, and 8x8 CPaaS Voice lists pricing on request.
Can it fit the software you already use?
Compare the public API mark, SDK languages and platform support with your current applications. Check the documentation depth before committing to an integration.
If you need to run code on your own infrastructure, look for self-hosted support and review the product's licence terms.
Questions
What should I compare in a Voice API?
Compare inbound and outbound calling, phone numbers, SIP, recording, concurrent-call limits, SDK languages, platforms, pricing and trial terms.
Do Voice APIs offer free plans?
The board marks products with a free plan and products with a free trial separately. Check both marks and the provider's pricing details.
Can a Voice API handle inbound and outbound calls?
Check the inbound-calling and outbound-calling fields for the product. Support can differ between services.
Which platforms can Voice APIs run on?
The board compares web, API, iOS, Android, Linux and self-hosted support, plus other platforms listed by a provider.
What is SIP support in a Voice API?
SIP is a standard way to connect phone calls between software and phone networks. Check the SIP-support field if your setup uses it.
Some top positions on this board can be paid placements, standing where they were sold. The facts on each platform are not for sale. How we rank · Disclosure