VAPI•2mo ago

Since a couple of days ago, assistants get removed from phone numbers.

A couple of days ago i've made a tool to duplicate assistants, and to dynamically assign assistants to a phone number. This works fine, but after a couple of hours the line gets the assistant removed and no further calls can be received.
Any idea what might be causing this ?

019a3097-61b3-7ee6-acc3-8aa6d9597d59 2025-10-29 15:30:18 GMT+0 2025-10-29 15:40:30 GMT+0
It was expected that the call woul be answered, and instead an error message was heard on the phone.
Thanks
Ignacio

Vapi Support BotAPP•10/29/25, 3:53 PM

Suggestion:
Double-check that your tool or workflow is not unintentionally clearing the assistant assignment after a few hours. To ensure the assistant remains assigned, you can periodically re-assign the assistant ID to your phone number using the Vapi API or Dashboard.

// Example: Assign assistant to phone number
await vapi.phoneNumbers.update({
  id: "your-phone-number-id",
  assistantId: "your-assistant-id"
});

// Example: Assign assistant to phone number
await vapi.phoneNumbers.update({
  id: "your-phone-number-id",
  assistantId: "your-assistant-id"
});

This helps prevent the "Assistant not valid" error and ensures calls are handled as expected (Discord discussion).

Source:

Discord discussion about Assistant not valid error

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

Since a couple of days ago, assistants get removed from phone numbers.

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