18.0
Telnyx SIP Trunking connects business phone systems to the public telephone network through the internet.
Free planAndroidiOSWeb
Best Voice APIs in 2026
Voice APIs let software place and receive phone calls through code. They can connect calling features to apps, websites, services or phone systems. Check Android support before choosing a tool. The listed platform coverage also includes web, iOS, APIs, self-hosted deployments and Linux; compare calling direction, phone numbers, SIP, recording and SDK languages.
27.6
AndroidiOSWeb
37.5
D7 Networks provides messaging services through APIs and a web platform, including SMS, WhatsApp, Viber, number lookup, and two-factor verification.
Free planWebAPI
- 4
Wazo Platform
Wazo Platform is an open source stack of telecom microservices for developers building programmable voice, video, messaging and presence services.
Free planAndroidiOSWebAPI7.5Free plan - 5
46elks
46elks is a telecom API for applications that send messages and make phone calls.
Free planWebAPI7.0From €3 a month - 6
Amazon Chime SDK PSTN Audio
Free planAndroidiOSWebAPI6.9Free plan - 7
Infobip Voice API
Infobip Voice API gives developers tools to add voice calls to mobile and web applications, including calls to landlines and mobile phones.
Free planAndroidiOSWebAPI6.9Free plan - 8
Plivo Voice API
Plivo Voice API lets developers add programmatic calling and interactive voice functions to web and mobile applications.
AndroidiOSWebAPI6.9From $1,000 a month - 9
Telnyx Voice API
Free planAndroidiOSWeb6.9From $500 a month - 10
CallFire API
CallFire API v2 is a REST API for connecting applications to CallFire telephony services.
Free planAPI6.5From $99 a month - 11
Aculab Cloud
Aculab Cloud provides APIs for businesses building applications for voice and video calls, messaging, and inbound or outbound fax.
AndroidiOSWebAPI6.4 - 12
FreeSWITCH
FreeSWITCH is an open-source framework for real-time voice and video communications.
Free planAPILinuxmacOSSelf-hosted6.4Free plan - 13
SIP.IO
SIP.IO is a programmable voice and cloud contact center platform for UCaaS, CCaaS, and Voice AI.
Free planWebAPI6.3Free plan - 146.2
- 15
Asterisk
Asterisk is a free, open-source framework for building communications applications.
Free planAPILinuxSelf-hosted6.0Free plan - 16
Kamailio
Free planAPILinuxSelf-hosted5.9Free plan - 17
VoIP.ms API
AndroidiOSWeb5.4 - 18
Amazon Chime SDK Voice Connector
WebAPISelf-hosted5.3 - 19
EnableX Voice API
AndroidiOSWeb5.3 - 20
Twilio Programmable Voice
AndroidiOSWeb5.3 - 21
Kaleyra Voice API
Kaleyra Voice API is a programmable calling service for businesses that need voice features inside apps and websites.
API5.1 - 225.0
- 23
5.0 - 24
Twilio Elastic SIP Trunking
Twilio Elastic SIP Trunking is a paid web-based service for SIP trunking.
Web4.9 - 254.7
Choosing well
Check Android and platform coverage
Android is listed for Amazon Chime SDK PSTN Audio. Check the platform field for the tool you plan to use, then confirm whether its Android support fits your app or device workflow.
Platform listings across this category include web, iOS, APIs, self-hosted deployments and Linux.
Match inbound and outbound calling
Compare inbound and outbound calling separately. Alianza Crux API lists inbound calling, while the chart records both directions where details are available.
Review phone number support and SIP support alongside calling direction if the API must connect to telephone networks or an existing voice system.
Compare plans and trial access
Pricing models include paid services and free software. Aculab Cloud lists a free plan and free trial, while Asterisk lists a free plan.
Published pricing can be a monthly starting price, a rate from $0.00, pricing on request or a stated trial period. Check the current plan terms before building around an API.
Review recording and call limits
Use the chart to compare call recording and concurrent call limits. These details help match an API to the call volume and recording workflow your software needs.
Check the provider's documentation for implementation details before relying on a limit or recording feature.
Check SDK languages and hosting
Compare the SDK languages listed for each API with the languages used by your project. A compatible SDK can reduce integration work.
If you need to run the voice system yourself, look for self-hosted and Linux support rather than assuming a hosted API provides it.
Questions people ask
Do these Voice APIs support Android?
Android is listed for Amazon Chime SDK PSTN Audio. Check the platform details for the API you are considering before planning an Android integration.
Are free options available?
Yes. Aculab Cloud lists a free plan and free trial, and Asterisk lists a free plan. Other entries use paid pricing models or require a pricing request.
Can a Voice API handle inbound calls?
Inbound calling is listed for Alianza Crux API. Compare inbound and outbound calling fields for the service you want to use.
Can I connect SIP systems?
SIP support is a comparison field in this category. Check the individual listing and its documentation for the SIP capability you need.
Do these APIs provide phone numbers?
Phone number support is a comparison field. Check the selected tool's listing for number availability and related calling features.