For teams building AI agents
Phone numbers for AI agents, without building telephony
Your agent can already write the email. VoixCall lets it make the call: its own US number, real phone calls to 200+ countries, and a handoff to a person when it matters.
Telephony is the part of an agent product nobody wants to build. You need numbers, carrier accounts, a voice pipeline, call control, transcripts, a way to bring a human in, and billing that doesn’t surprise anyone. VoixCall packages that behind one prompt and an MCP server, so you can test an agent on a real phone line today and decide later whether to build your own.
One prompt
Paste this into Claude, ChatGPT or any agent that can read a page and call an API:
Set up VoixCall for me. Read https://voixcall.com/skills.md , get yourself a phone number and call me.The agent signs up with your email, asks you for the 6-digit code we send, gets its own US number and $1 of credit, and rings you to say it’s live. The whole flow is in skills.md.
What the agent can do
- Place calls. A voice AI talks from the agent’s prompt and the task you give each call, such as confirming a booking or asking a supplier for a delivery date. The transcript and cost are available when the call ends.
- Answer a number. Point any number on the account at the agent and it picks up incoming calls.
- Hand the call to a person. The caller asks for a human, the human’s app rings, and they press 1 to take it. You can set a front-desk number instead.
- Use the account as tools. Rates, balance, call history, contacts, call summaries and incoming texts are all available over MCP at
https://api.voixcall.com/mcp.
Pricing that fits a prototype
Agent calls cost about 12¢ to 25¢ a minute depending on the destination, billed per second. That covers the carrier and the voice AI. The agent’s number is free for the first month and $2 a month after. There are no platform fees or seats, and credit never expires. Check any destination before dialling with voixcall_get_rate.
Where it fits
- Personal and executive assistants that book, confirm and chase things by phone.
- Support and operations agents that call vendors, hotels or carriers.
- After-hours answering for a founder or a small team in another time zone.
- Testing your own voice agent against a real phone call before you buy telephony.
Not for robocalling, lead lists or cold outreach. Agents may call only people who expect to hear from you.
Questions
Does the agent need a developer account or a Twilio key?
No. The agent signs up through the API with a human’s email and the 6-digit code sent to it. It gets an API key, its own US number and $1 of trial credit. There is no carrier account to set up.
Can it call anyone it wants?
It places a call only when its human asks, and should tell them the destination and the rate first. Emergency numbers are blocked, and it can’t buy numbers or take payment. Every call shows up in the human’s dashboard.
How does the handoff work?
When the caller asks for a person, the human’s VoixCall app or browser rings first, then their verified mobile. They hear who is calling and why and press 1 to accept. If nobody accepts, the caller hears a voicemail message you set.
Can it send texts?
Not yet. It can read texts that arrive on a number once the account has topped up once, which covers login codes and replies.
Which agents work?
Any agent that can read a web page and call an HTTP API or MCP server: Claude, ChatGPT, Claude Code, Cursor, and agents you build yourself. The instructions are at voixcall.com/skills.md.