Twilio Voice API
agentpaidAPI Available
4.8/ 5.0
Programmable telephony API that connects software to the PSTN (phone lines) and SIP endpoints, essential for voice agents.
Supported Languages
N/A (Telephony)
Quick Overview
Pros
- Industry standard for phone connectivity
- Massive ecosystem and documentation
- Reliable global infrastructure
Cons
- Pricing can be complex/opaque
- Requires separate NLU/STT/TTS engines
Stacks using Twilio Voice API(5)
Automated Phone-Based Lead Qualification Agent
agentHigh volume, pre-qualified leads delivered to the sales team, saving SDR time.
Retell AI
Google Dialogflow CX
Twilio Voice API
Voice Biometrics & Fraud Detection Agent
agentSecuring voice transactions with passive voice authentication and real-time fraud detection.
Amazon Polly
Twilio Voice API
Pindrop
AI-Driven Real-Time Call Transcription
notes-tasksInstant, accurate transcriptions for live calls, enabling real-time QA and coaching.
Deepgram
Twilio Voice API
Krisp
Outbound Marketing Campaign Dialing
marketingAutomated, scalable outbound dialing for lead generation, surveys, or announcements.
ElevenLabs
Vonage Voice API
Twilio Voice API
AI Agent Handoff to Human Support
support-botImproved customer experience by minimizing repetition after an AI to human handoff.
Retell AI
Twilio Voice API
Whisper (OpenAI API)