Calling - Do you IM your contact to see if they’re free before you try calling them?
  v3.0 Posted at 12/12/2018 6:39 AM by Tiago Araujo

​Always try to ping someone on IM first with "can I call you now?", because they might be with a client, or in a session.​

The exception to this rule is when you're blocked and cannot proceed with a task without speaking to them. 

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