Welcome to the RingCentral Community

Hi Tyler,

I have specified correct contentType in my fax message but though its giving me above error.don't know how.

i have attached one pdf file in fax message and given contentType = "application/pdf".

here is response where xyz specify messageid.

{
  "uri": "https://platform.devtest.ringcentral.com/restapi/v1.0/account/~/extension/~/message-store/xyz";,
  "id": xyz,
  "to": [
    {
      "phoneNumber": "+14246347683",
      "location": "Redondo, CA",
      "messageStatus": "SendingFailed",
      "faxErrorCode": "RenderingFailed"
    }
  ],
  "type": "Fax",
  "creationTime": "2017-12-06T04:58:58.000Z",
  "readStatus": "Unread",
  "priority": "Normal",
  "attachments": [
    {
      "id": xyz,
      "uri": "https://media.devtest.ringcentral.com/restapi/v1.0/account/~/extension/~/message-store/xyz/content/x...;,
      "type": "RenderedDocument",
      "contentType": "application/pdf"
    }
  ],
  "direction": "Outbound",
  "availability": "Alive",
  "messageStatus": "SendingFailed",
  "faxResolution": "High",
  "faxPageCount": 0,
  "lastModifiedTime": "2017-12-06T05:05:23.637Z",
  "coverIndex": 7,
  "coverPageText": "TEst note"
}

RenderingFailed usually means contentType is wrong.

For example, you want to fax a PNG image, and you specify contentType = "application/pdf". Server side cannot render a PNG image as PDF, thus RenderingFailed.