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ChatGPT connects to Sempera Phone as a custom MCP server and signs in with OAuth. Once you approve it, ChatGPT can preview calls and texts for you to approve, start the ones you approved, and read their results. Status: Unverified. The server side is built and tested against the published standards, but no real ChatGPT account has completed the connection yet (Supported clients). If a screen differs from these steps, tell hello@sempera.org and this page will be corrected.

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Add Sempera as a custom MCP server

  1. In ChatGPT, open the place where you add plugins and connectors, choose the plus button, then Add custom MCP server.
  2. Enter the server URL below and choose OAuth. Leave the client ID empty, so ChatGPT registers itself.
  3. Create and install it. ChatGPT opens Sempera’s consent page.
  4. Sign in, check that the request names ChatGPT, choose the workspace and the phone permissions, and approve. Approving charges nothing.
The consent page shows the redirect https://chatgpt.com/connector_platform_oauth_redirect as ChatGPT.

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Permissions

A client that asks for nothing gets phone:read only. To change permissions, approve ChatGPT again; the new grant replaces the old one.

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Check the connection

Ask the assistant for your Sempera Phone number and what is left this period. That is a read: it places nothing and needs only phone:read. The same read over plain HTTP, with a phone credential from Settings, Connected clients:
An ordinary workspace API key is refused on the phone routes: every phone credential is a connected client (an OAuth grant, an MCP connection or a REST credential), so it can be revoked on its own.

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What happens on a call

  1. The assistant calls phone_preview_call (or POST /v1/phone-tasks/preview) with the number, the task, the permitted_actions and an optional max_minutes. Nothing is dialled or reserved. The answer carries an approval link, or standing: true if a standing approval covers that number.
  2. You open the link signed in to Sempera, read the exact request and approve or decline. The approval is good for five minutes.
  3. The assistant calls phone_start_call with the same values. Any change is refused. The task moves to reserved, which means queued, not dialling.
  4. The assistant follows the task with phone_get_task until completed, failed or cancelled. The result is marked untrusted: it was written from what someone else said.
Texts work the same way with phone_preview_text and phone_send_text. The full rules, limits and refusal codes are in Personal phone plan.

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Before the first call

The plan is not open for purchase yet. When it opens, a first call also needs a number on the account and a published Sempera agent pinned to the plan; until then a start is refused with PHONE_PLAN_INACTIVE, PHONE_NUMBER_MISSING or PHONE_AGENT_UNPINNED. Calls and texts go out only while it is between 9 a.m. and 9 p.m. in both Toronto and Vancouver (noon to 9 p.m. Eastern); outside that window they are refused with PHONE_OUTSIDE_HOURS.

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Disconnect

Open Settings, Connected clients in the Sempera App and revoke the client. That ends its credential at once and leaves every other assistant working. ChatGPT is a trademark of its owner, used here only to say which assistant connects. Sempera is not affiliated with, sponsored by or endorsed by the maker of ChatGPT.