18.0
Telnyx SIP Trunking connects business phone systems to the public telephone network through the internet.
Free planAndroidiOSWeb
Alternatives to FreeSWITCH
FreeSWITCH is an open-source framework for building real-time voice and video systems. It routes calls, bridges video, transcodes media and connects protocols, with SIP support, inbound and outbound calling, and call recording. Its Event Socket exposes call and channel control to external processes, and teams can connect code through HTTP backends or embedded languages. It runs on Linux, macOS and Windows, and production use is free under the MPL license. That breadth also…
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
Dollu Voice API
Free planWebAPI6.3Free 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
Azure Communication Services SMS
AndroidiOSWebAPI6.1 - 16
Asterisk
Asterisk is a free, open-source framework for building communications applications.
Free planAPILinuxSelf-hosted6.0Free plan - 17
Kamailio
Free planAPILinuxSelf-hosted5.9Free plan - 18
VoIP.ms API
AndroidiOSWeb5.4 - 19
Amazon Chime SDK Voice Connector
WebAPISelf-hosted5.3 - 20
EnableX Voice API
AndroidiOSWeb5.3 - 21
Twilio Programmable Voice
AndroidiOSWeb5.3 - 22
Kaleyra Voice API
Kaleyra Voice API is a programmable calling service for businesses that need voice features inside apps and websites.
API5.1 - 235.0
- 24
5.0 - 25
Twilio Elastic SIP Trunking
Twilio Elastic SIP Trunking is a paid web-based service for SIP trunking.
Web4.9 - 264.7
- 274.7
- 284.7
- 29
Kazoo
Web4.7 - 304.7