how i can match the number that is calling to me

[Magui]

Hello I am new with freeradius ,I wan to know if is posible
to restrict an acces to the network using the telelephon number 
of who is calling for the acces to the network by the ppp conection
How I can use radius for match user password and telephone number
combination as conditions for acces to my network

I will be very grateful if somebody can help me




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