OpenPhonex: agent-native telephony is live
Real phone numbers, calls, and SMS an AI agent can run on its own — over MCP, described in llms.txt. Here is what shipped and how it deploys.
By OpenPhonex Team
Agents are ready. Phone infrastructure was still the hard part — until now. OpenPhonex is live: real phone numbers, calls, and SMS that an AI agent can run on its own, exposed over MCP and described in llms.txt so any MCP-capable agent already knows how to use it.
Getting a working phone number is one step. Getting calls to route, recordings to capture, transcripts to index, SMS to activate, outbound to pass review, and the whole stack to run in production is the part that used to take months. OpenPhonex makes the full call lifecycle programmable behind one scoped API key.
Two ways to deploy at MVP
Every deployment answers two questions: who provides the brain, and where the media runs. The two launch paths differ only on the second:
fully_managed_cloud— OpenPhonex Cloud runs the API, the hosted media gateway, the provider account, numbers, credits, compliance, and abuse controls. The fastest path to a live line.managed_numbers_self_hosted_gateway— you run the media gateway (Docker locally) while OpenPhonex Cloud still manages the API account, numbers, billing, compliance, and provider operations. Use it when call media must stay in your own network.
Full detail is in Deployment modes.
The MCP + llms.txt story
Because every capability is an MCP tool with a required_scopes contract, and
because the whole surface is described in llms.txt, there is no bespoke
integration to write. Point an MCP client at POST /mcp, pass a scoped tai_
key, and the OpenPhonex tools show up in tools/list. Prefer REST? The same key
authenticates a plain JSON API, and the OpenAPI spec is
generated from the running service.
Safe by default
Live outbound calls and SMS are policy-gated: the agent evaluates
evaluate_outbound_policy, surfaces the decision and cost, and waits for an
explicit human yes. Scopes fail closed, and whole categories of outbound —
telemarketing, mass outreach, broker campaigns — are blocked regardless of scope.
Get started
The Quickstart takes you from an empty checkout to your agent placing a trial call in about five minutes: install the connector, mint a scoped key, and ask your agent in plain language.