How To Combine Two Columns Into One In An Sql

I have an stored procedure that returns 3 columns. Month, Date, and Total Number of Calls.

Here is the stored Proc:

SELECT DATEPART(mm, CALLSTARTTIME) ,  DATEPART(dd, CALLSTARTTIME), COUNT(*)

FROM CALL_LOG_MASTER

WHERE (COMMERCIALS = '1') AND (PINCODE IS NOT NULL)

GROUP BY DATEPART(mm, CALLSTARTTIME), DATEPART(dd, CALLSTARTTIME)

ORDER BY DATEPART(mm, CALLSTARTTIME), DATEPART(dd, CALLSTARTTIME)

It returns a table:

MONTH   DATE   TOTAL NUMBER OF CALLS=======   =====   ===========1                  1               10

1                  2               15

My question is: is it possible to combine the Month and Date column into one column. e.g.

Date   Total Number of Calls====   ==============1/1      101/2      15

Please Help, Thanks in advance :)