Execute Oracle stored procedure from ArcSDESQLExecute

Question

I'm attempting to execute an Oracle 12c stored procedure using ArcSDESQLExecute:

import arcpy

egdb_conn = arcpy.ArcSDESQLExecute(r"Database Connections\con1.sde")

sql = '''execute update_sle (2500000, 500000)'''
egdb_return = egdb_conn.execute(sql)

print "Complete."

However, I'm getting the following error:

Message File Name   Line    Position    
Traceback               
    <module>    <module1>   21      
    execute C:\Program Files (x86)\ArcGIS\Desktop10.3\ArcPy\arcpy\arcobjects\arcobjects.py  27      
AttributeError: ArcSDESQLExecute: StreamExecute ArcSDE Extended error 900 ORA-00900: invalid SQL statement              

Question:

How can I execute an Oracle stored procedure by using ArcSDESQLExecute?

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Notes:

1. The python script executes successfully on select queries. Therefore, I know the script works.
2. I can execute the procedure from SQL Developer successfully. Therefore, I know the procedure works.
3. I tried SET FEEDBACK OFF but got an error. More info here.
4. Related question/answer here, but I think it's for SQL Server.

Answer 1

As mentioned in this thread, replacing EXECUTE with CALL can resolve this issue - sometimes at least.

This SO response addresses the issue more generally, suggesting it's not peculiar to ArcGIS.