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#2 Plivo
Scalable voice and SMS APIs with SIP trunking, call recording, and conference support. Competitive pricing and global coverage.
Robust voice API for PSTN calls, SIP endpoints, and interactive voice response (IVR). Includes call recording, transcription, and real‑time analytics.
#4 Bandwidth
Carrier‑grade voice APIs with direct PSTN access, number provisioning, and advanced call control features like conferencing and BXML.
#5 SignalWire
Programmable voice platform built on the same technology as Twilio, offering low‑latency SIP, WebRTC, and AI‑driven call routing.
#6 Telnyx
Communications cloud with voice APIs, SIP trunking, and programmable call flows. Offers real‑time media streaming and edge‑based routing.
#7 Voximplant
Cloud‑based platform for building voice applications with JavaScript SDKs, real‑time media processing, and AI integration.
Real‑time voice calling SDKs for mobile and web, supporting low‑latency group calls, recording, and AI noise suppression.
Global voice calling, number verification, and PSTN connectivity with programmable call flows and analytics.
#10 Infobip Voice
Voice messaging, programmable calls, and IVR capabilities with a focus on omnichannel engagement and AI bots.
Programmable voice API with call forwarding, conferencing, and real‑time transcription. Integrated with omnichannel messaging.
Enterprise‑grade voice platform offering SIP trunking, call handling, and integration with RingCentral's unified communications suite.
#13 8x8 Voice API
Cloud voice services with programmable call control, SIP trunking, and analytics for contact centers.
Legacy programmable voice service with simple scripting, call routing, and integration with Cisco's communication tools.
#15 Flowroute
SIP trunking and voice API with transparent pricing, high‑quality routing, and detailed call logs.
#16 Exotel
India‑focused cloud telephony platform offering voice APIs, IVR, and call recording with local number support.
#17 CallFire
Voice broadcasting, IVR, and programmable voice API for outbound campaigns and two‑way calling.
#18 VoIP.ms
Low‑cost SIP trunking and programmable voice services with extensive API documentation and DIDs in many countries.
Contact‑center platform with built‑in voice capabilities, programmable routing, and AI‑powered assistance.
Embedded voice SDKs for mobile and web apps, offering call control, recording, and PSTN connectivity.
Legacy voice API offering call handling, conferencing, and number provisioning; now integrated under Vonage.