ThunderPhone
ThunderPhone is an AI a voice AI platform for running real-time inbound and outbound phone agents across PSTN, web and app channels. Operators and developers use it to automate calls, ground answers on documents and supervise live conversations.
About ThunderPhone
ThunderPhone is an AI a full-stack voice AI platform that runs production phone agents over real telephony or embedded in web and mobile apps. The service combines multi-source transcription and direct audio-to-LLM input so agents hear noisy, accented or interrupted speech and answer from your documents with retrieval grounding. Public benchmarks on BigBench Audio are published on the site as a performance reference.
The product offers a no-code operator app for launching agents, running A/B experiments, pacing outbound campaigns and watching live calls, plus a REST API that exposes the same runtime (example: POST /v1/calls). Native SIP trunking and a guided trunk-detection wizard let teams attach existing carriers without reworking routing. Core telephony features include HD Voice support, DTMF capture, voicemail and screener detection, cold/warm/human transfers with context preservation, and live whisper supervision.
ThunderPhone provides compliance and enterprise options such as HIPAA and GDPR support, a BAA and a DPA at no extra charge, BYO-LLM via ThunderSocket, and data residency or bespoke deployments for high-volume customers. Public pricing starts at 2¢ per minute with surcharges for long prompts, higher intelligence levels and premium voices; enterprise customers can request custom per-minute cost targets.
Environment Web app, REST API, PSTN/SIP and embedded web/app clients
Integrations CRM, calendar systems, knowledge bases, MCP servers and generic APIs
Core Loops Describe the job in plain language Connect your carrier via SIP trunk wizard Paste requests or wire up integrations and launch
Capabilities Real-time multi-source transcription fused with audio-to-LLM input Capabilities Live call monitoring, whisper guidance and AI-graded test calls Capabilities Outbound campaign pacing, retries and TCPA-capable cold outbound with ThunderHuman Capabilities Document grounding and retrieval for factual agent answers
Public pay-as-you-go pricing starts at 2¢ per minute; the site notes base prices and that surcharges apply for long prompts, higher intelligence tiers and premium voices.
Discover ThunderPhone and thousands of other AI tools on Beyond The AI, your trusted directory for AI solutions.
Who is using ThunderPhone?
Key Features
- Native SIP trunking with a trunk-detection wizard to connect your existing carrier
- No-code operator app for agents, A/B experiments, campaign pacing, and live supervision
- REST API (POST /v1/calls) exposing the same runtime used by the platform
- Multi-source transcription plus direct audio-to-LLM input to reduce mishearing names and mumbles
- Language support for 40+ languages with mid-call language switching
- Telephony features: DTMF capture, voicemail and screener detection, and cold/warm/human transfers
- Knowledge grounding: upload documents for retrieval and deploy agents that answer from your materials
- Enterprise options including BYO-LLM via ThunderSocket, data residency and BAA/DPA for compliance
Use Cases
- Place and receive live inbound support calls with knowledge-grounded answers
- Run bulk outbound campaigns with pacing, retries and voicemail handling
- Supervise and whisper on live calls while preserving agent context during transfers
- A/B test agent prompts and automatically apply improvements from scored calls
- Conduct HIPAA-compliant patient outreach or other regulated communications