AgentLine
Show HN: Phone Number for AI Agents Like Hermes and OpenClaw
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What is AgentLine?
AgentLine is a voice and messaging infrastructure layer for AI agents that gives them real phone numbers, supports inbound and outbound calls, and sends clean JSON with real-time transcription to your agent’s webhook. It is designed to let agents speak naturally over the phone without requiring telecom engineering knowledge. The website positions it as a fast way to add calling, SMS, and phone-based workflows to AI systems through one API and a simple setup flow.
A central part of the product is the prompt-to-call workflow: you can instruct an AI agent to get a number, place a call, and handle conversations using AgentLine. The site highlights an install-in-30-seconds style skill file that works with tools like Claude Code, Cursor, and OpenClaw, which suggests the product is meant to be easy to plug into existing agent workflows. It also emphasizes that the platform handles the raw audio layer and produces structured output for the agent to consume.
AgentLine appears especially focused on practical business and automation use cases. The site showcases inbound support, outbound sales, verification inboxes for 2FA codes, feedback collection, and personal assistant calls. It also mentions call transcripts, billing tracking, and monitoring, which make it useful for teams that want to review conversations and improve prompts over time.
The tool is aimed at developers, AI builders, startups, and businesses that want phone capabilities without building telecom infrastructure themselves. The website repeatedly frames it as suitable for people who want to launch voice agents quickly, connect them to their data, and iterate based on call transcripts. It is also presented as a fit for autonomous agents that need a real phone identity and the ability to interact with humans by voice or SMS.
AgentLine pricing
Pricing model: Freemium
The website says new signups get $2.50 in free credit, enough for a first test call. It also says phone numbers cost $2.00 one-time. The site does not show detailed paid plans or tiered subscription pricing in the visible content; instead, it emphasizes pay-as-you-use style basics such as credits and number purchase. The website highlights dashboard and API usage, plus billing monitoring, but does not publish a full plan comparison on the main page.
AgentLine pros
- Gives AI agents real phone numbers
- Supports inbound calls
- Supports outbound calls
- Handles SMS messaging
- Provides real-time transcription
- Returns clean JSON to webhooks
- Works through one REST API
- Has a fast prompt-to-call setup flow
- Offers a skill file for agent tools
- Integrates with Claude Code, Cursor, and OpenClaw
- No telecom knowledge required
- Includes call transcripts for review
- Supports human escalation from AI calls
- Can be used for 2FA and verification inboxes
- Useful for inbound support queues
- Useful for outbound sales and feedback collection
- Supports personal assistant voice workflows
- Allows routing existing business numbers
- Includes billing and usage monitoring
- Provides dashboard and API-based setup
AgentLine cons
- Requires an API key and technical setup
- Depends on webhook integration for data lookups
- Phone numbers cost extra
- Website pricing details are limited
- Some features are shown as demos rather than fully documented
- Country support is only hinted at in FAQ headings
- SMS and call behavior may require prompt tuning
- Best results depend on iterative testing and prompt refinement
- Transcripts and monitoring require ongoing review
- Not a full telecom replacement for complex enterprise needs
Frequently asked questions about AgentLine
What does AgentLine actually do?
AgentLine gives AI agents real phone numbers and telephony capabilities so they can make outbound calls, receive inbound calls, send SMS, and work with real-time transcription. It is built to turn an AI agent into something that can talk to humans over the phone without the user needing to build telecom infrastructure from scratch.
How does the setup work?
The site presents a very short setup flow: sign up, get an API key, create an agent, buy a phone number, set the system prompt, and test the number. It also shows a skill-file approach where you download one file, add it to your AI agent, set the API key, and then instruct the agent to call a number.
Do I need telecom experience to use it?
No. The website explicitly says no telecom knowledge is required and frames the product as a way to avoid telecom engineering complexity. The product handles the audio and call infrastructure while you focus on the agent behavior and prompt design.
What kind of use cases is it built for?
The site highlights inbound customer support, outbound sales, feedback collection, 2FA and verification inboxes, and personal assistant calls. It is presented as a general-purpose telephony layer for AI agents that need to interact with people by voice or SMS.
Can it escalate to a human?
Yes. The blog specifically describes automatic escalation to a human when the AI reaches its limits. It also recommends defining what the agent cannot handle in the system prompt so those cases can be handed off cleanly.
Does it store transcripts?
Yes. The website and blog both mention call transcripts, and the blog says transcripts are stored for review and improvement. The site also suggests using transcripts to monitor early calls and refine prompts over time.
How much does it cost to start?
The main page says new users get $2.50 in free credit on signup, enough for a first test call. The blog says phone numbers cost $2.00 one-time. The visible site content does not show detailed monthly plans or broader pricing tiers.
Can I use it with my existing AI tools?
Yes. The site explicitly mentions Claude Code, Cursor, OpenClaw, and other agents through the skill-file workflow. It also shows a REST API and mentions a webhook-based integration pattern for connecting to your own data.
What does the agent do with audio?
The site says AgentLine handles the raw audio streams and transcribes them in real time, then sends clean JSON to the agent’s webhook. That suggests the product is designed to abstract away low-level voice handling and expose structured data to the AI layer.
Can I route my existing business number?
Yes. The blog says that once testing is complete, you can route your existing business number to your AgentLine number or simply start giving out the new number. That makes it possible to adopt the platform without abandoning your current phone setup immediately.