curl --request DELETE \
  --url https://api.open.cx/phone/sip/inbound-trunk/phone-numbers/{phone_number}

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "sip_endpoint": "<string>",
  "auth_username": "<string>",
  "auth_password": "<string>",
  "phone_numbers": [
    "<string>"
  ],
  "krisp_enabled": true,
  "agent_id_header": "<string>"
}