we have requirement when plan is expired or credit exhausted, all incoming call should be hangup so as of now there is not way to support this.

Vapi does not currently support a direct way to hang up all incoming calls via a global setting or hook. However, you can use a phone number hook to play a message when a call is ringing, effectively informing callers that inbound calls are disabled (e.g., due to plan expiration):

json
{
  "hooks": [{
    "on": "call.ringing",
    "do": [{
      "type": "say",
      "exact": "Inbound calling is disabled due to plan expiration."
    }]
  }]
}

This will not forcibly hang up the call, but it will prevent the call from being answered by your system. [See documentation for details](https://docs.vapi.ai/phone-numbers/phone-number-hooks#example-say-message-on-call-ringing). Source: - [Phone Number Hooks Documentation](https://docs.vapi.ai/phone-numbers/phone-number-hooks)

Implement a webhook that checks the caller’s plan or credit status on each incoming call, if expired or exhausted, respond with an error in the assistant-request webhook to trigger Vapi’s automatic hangup, and optionally add a Hangup node in your call flow to ensure calls end cleanly..