Time series dash from mysql

Grafana Configuration
1

Hi

I am running Grafana 7.5.4
I have a mysql table which has time in unixtime milliseconds and values that I would like to graph on a table with the call type.

We would like to see how many calls in a selectable timeframe and the type of call (call_type)

the table looks as follows

mysql> select * from voip_calls limit 1\G
*************************** 1. row ***************************
          voip_call_id: ADEtiFrtdnsjks543
             call_type: audio
call_started_timestamp: 1601282548609
  call_ended_timestamp: 1601282612693
        caller_user_id: 1234567

I have the following but it is not working:

SELECT
  $__unixEpochGroupAlias(call_started_timestamp,$__interval),
  call_type
FROM voip_calls
GROUP BY 1