Calls made on phonenumber over 3 in 15 days by users using MDX

Hello Friends

I have to calculate measure Calls made on phonenumber over 3 in 15 days by users

Users    Phonenumber   Calltimes

u1         123456              15nov

u2         23564                 16nov

u3         258965              17nov

u1         85965                15nov

u1         123456              14nov

u1         123456               2nov

u1        123456                9 oct

Calls made on Phone_Number over 3 in 15 days by users.

i can easily write this in SQLQUERY

--phone number call >3 times in 15 days

select phonenumber,count(1)
from tbl WHERE calltimes >= DATEADD(d,-15,GETDATE())
group by phonenumber
having count(1)>1

How can i write this in MDX Query.

Kindly help friends.