Please follow to the letter these instructions:
https://www.3cx.com/docs/bitrix24-crm-integration/
Please check with screenshot
But in log having same issue
2020/10/15 08:33:50.746|6416|0067|Erro|CHR: Call type is invalid or not specified Unknown
2020/10/15 08:33:50.746|6416|0067|Erro|CHR: Call type is invalid or not specified Unknown
2020/10/15 08:33:50.746|6416|0067|Erro|CHR: Call type is invalid or not specified Unknown
2020/10/15 08:33:50.746|6416|0067|Erro|CHR: Call type is invalid or not specified Unknown
2020/10/15 11:03:07.656|6416|0022|Erro|Exception during contact creation: An error occurred while sending the request.
2020/10/15 15:24:31.136|6416|0080|Erro|Exception during number processing: System.Threading.Tasks.TaskCanceledException: The operation was canceled.
---> System.IO.IOException: Unable to read data from the transport connection: The I/O operation has been aborted because of either a thread exit or an application request..
---> System.Net.Sockets.SocketException (995): The I/O operation has been aborted because of either a thread exit or an application request.
--- End of inner exception stack trace ---
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.GetResult(Int16 token)
at System.Net.Security.SslStream.<FillBufferAsync>g__InternalFillBufferAsync|215_0[TReadAdapter](TReadAdapter adap, ValueTask`1 task, Int32 min, Int32 initial)
at System.Net.Security.SslStream.ReadAsyncInternal[TReadAdapter](TReadAdapter adapter, Memory`1 buffer)
at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.SendWithNtConnectionAuthAsync(HttpConnection connection, HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at Microsoft.Extensions.Http.Logging.LoggingHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
at CrmIntegration.ScenarioProcessorBase.ProcessRequest(ScenarioRequest request, IValueManager customManager, HttpClient client, CancellationToken token)
at CrmIntegration.ScenarioProcessorBase.ProcessScenario(ProtocolScenario scenario, IValueManager customManager, CancellationToken token)
at CrmIntegration.ScenarioProcessorBase.Execute(ProtocolScenario scenario, CancellationToken token)
at CrmIntegration.CrmProcessor.GetContactInfoFromCrm(String contactNumber, String destinationEmail, Boolean createIfNotFound, CancellationToken token)