mfa login

Hello,
i have exchange server 2016 i want to make mfa so when the user enter the user name and password the system will send an sms to thier mobiles with a code then the user will enter the code to login
can i do it ?
or is there any way to make the user authenticate through vpn to system through sms code ?
idont want the user to have usb token because it's not easy to get the usb token or cert because it;s a public mail system like gmail or live.
thanks.
Amin El-ZeinAsked:
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Hasin Ahmed ChoudharyExchange AdministratorCommented:
Do you intend to use 3rd-party 2FA auth tool like Cisco or duo?

If you wish to use MFA , explore this link :
http://msexchangeguru.com/2017/01/16/secure-owa-ecp-with-mfa/
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Amin El-ZeinAuthor Commented:
Hello,
is there any free tools?
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Amin El-ZeinAuthor Commented:
also the link is describe about using usb token not sms verification.
thanks.
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Hasin Ahmed ChoudharyExchange AdministratorCommented:
Hello,

You can use Azure MFA solution or any third partyone. I doubt if there are any free tool available which support exchange.
https://c7solutions.com/2015/01/exchange-owa-and-multi-factor-authentication 

Exchange Cu8 will support MFA.
https://blogs.technet.microsoft.com/exchange/2017/12/06/announcing-hybrid-modern-authentication-for-exchange-on-premises/
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Amin El-ZeinAuthor Commented:
hello,
regarding the first link is it only for window azure ? or i can install it on my std server and std exchange ?
regarding the second link no sms on it.
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Hasin Ahmed ChoudharyExchange AdministratorCommented:
No other solution provided
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