SMPPEX.Session.call

You're seeing just the function call, go back to SMPPEX.Session module for more information.
Link to this function

call(pid, request, timeout \\ 5000)

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Specs

call(session(), request :: term(), timeout()) :: term()

Makes a syncronous call to the session.

The call is handled by handle_call/3 SMPPEX.Session callback.