retrieve UM Auto Attendant configuration

in this-link there are many shell commands for editing UM Auto Attendant configuration , 

but there are no commands for retrieve the same information ... is EWS API is the answer? 

I'm trying with C# / shell commands to get these information 

How I  : 

get UMAutoAttendant Business Hours ?

get Business Hours Greeting ? 

etc...

for example you can change business hours schedule  , but you can't get the same data

Set-UMAutoAttendant -Identity MyUMAutoAttendant -BusinessHoursSchedule 0.10:45-0.13:15,1.09:00-1.17:00,6.09:00-6.16:30

I wanna retreive the same information 

0.10:45-0.13:15,1.09:00-1.17:00,6.09:00-6.16:30

the only thing i can get is

[PS] C:\Windows\system32>Get-UMAutoAttendant -Identity ZakosUM

Name              UMDialPlan                PilotIdentifierList       SpeechEnabled            Status
----              ----------                -------------------       -------------            ------
ZakosUM           DP                        {}                        True                     Enabled

thanks