OTP autentication to a mobile phone (sometimes called mobile TAN/mTAN)

[Verlag Neue Stadt]

Hello,

we would like to have captive users(authentication portal) authenticated 
with a one time password (OTP).

After entering the user-account at the captive login page, preferably 
a/the RADIUS server should send
the unique autentication number (sometimes called mobile TAN/mTAN or 
OTP) to the users mobile
phone in order to gant access.


Is something like that possible with freeradius?


Thank's for any feedback. John