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Are you sending "true" as string or boolean?

This parameter causes an error in my case:

{
  "errorCode" : "InvalidParameter",
  "message" : "Parameter [withRecording] value is invalid",
  "errors" : [ {
    "errorCode" : "CMN-101",
    "message" : "Parameter [withRecording] value is invalid",
    "parameterName" : "withRecording"
  } ],
  "parameterName" : "withRecording"
}

Yes I think you need this parameter https://github.com/ringcentral/ringcentral-csharp-client/blob/master/RingCentral.Test/BinaryTest.cs#...

"withRecording = true"

In the request, I send the parameters /account/'.$accountId.'/extension/'.$extensionId.'/call-log and get an array in response, but there is no recording property. Do I need to specify some additional parameter in my case to get this property. Maybe something has changed in the API ?

Here is sample code for call recording download: https://github.com/ringcentral/ringcentral-csharp-client/blob/master/RingCentral.Test/BinaryTest.cs#...

In the body of a call log record, there is a recording property where you can fetch information about it especially its ID.