curl --request POST \
  --url https://api.hubapi.com/crm/extensions/calling/2026-03/inbound-call \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "createEngagement": true,
  "engagementProperties": {},
  "externalCallId": "<string>",
  "finalCallStatus": "BUSY",
  "fromNumber": {
    "e164Number": "<string>",
    "phoneNumberType": "FIXED_LINE",
    "extension": "<string>"
  },
  "potentialRecipientUserIds": [
    123
  ],
  "toNumber": {
    "e164Number": "<string>",
    "phoneNumberType": "FIXED_LINE",
    "extension": "<string>"
  },
  "callStartedTimestamp": "2023-11-07T05:31:56Z",
  "durationSeconds": 123,
  "userId": 123
}
'

{
  "callerIdMatches": [
    {
      "callerIdType": "CONTACT",
      "objectCoordinates": {
        "objectId": 123,
        "objectTypeId": "<string>",
        "portalId": 123
      },
      "email": "<string>",
      "firstName": "<string>",
      "lastName": "<string>"
    }
  ]
}