SQL - Combine another SELECT query with a JOIN - sql-server

Question

I found this post on stackoverflow, Add a summary row with totals
What I'm trying to accomplish is just that, but with the converted DURATION field I have listed in this WITH statement below. I'm trying to TOTAL up the Durations column for that day(24 hr period). I don't know if it's possible. Let me know. Thank you!
;WITH dupes AS
(
SELECT
CALLER_PHONE, DIALED_PHONE
FROM
dbo.PBXDATA
GROUP BY
CALLER_PHONE, DIALED_PHONE
)
SELECT
c.CALL_TIME, c.SALES_REP, c.CALL_TYPE, c.FLAG1,
COALESCE(NULLIF(c.FLAG3, 'NULL'),'') AS FLAG3,
ISNULL(dupes.CALLER_PHONE, '') + ISNULL(dupes.DIALED_PHONE,'') AS PHONE,
CONVERT(VARCHAR(8), c.DURATION, 108) AS DURATION
FROM
dupes
JOIN
dbo.PBXDATA c ON dupes.CALLER_PHONE = c.CALLER_PHONE
OR dupes.DIALED_PHONE = c.DIALED_PHONE
WHERE
(c.SALES_REP LIKE 'Doug%' OR
c.SALES_REP LIKE 'Nick%' OR
c.SALES_REP LIKE 'Bob%' OR
c.SALES_REP LIKE 'Joe%' OR
c.SALES_REP LIKE 'John%')
AND (c.CALL_TIME >= DATEADD(DAY, 0, DATEDIFF(DAY, 0, CURRENT_TIMESTAMP)))
AND (c.CALL_TIME < DATEADD(DAY, 1, DATEDIFF(DAY, 0, CURRENT_TIMESTAMP)))
AND DURATION = (SELECT CAST(DATEADD(S, SUM(DATEDIFF(S, '00:00:00', DURATION)), '00:00:00') AS TIME)
FROM dbo.PBXDATA)
ORDER BY
c.CALL_TIME;

Answer 1

If you just want an overall total for the Duration in your dupes table, you can just sum your Duration there.
;WITH dupes AS
(
SELECT CALLER_PHONE, DIALED_PHONE, convert(varchar(8), SUM(c.DURATION), 108) AS Total_Time
FROM dbo.PBXDATA
GROUP BY CALLER_PHONE, DIALED_PHONE
)
And add , Total_Time to your SELECT statement.
If you have multiple days in your query, you would need to add the date field in the dupes and add it as part of the JOIN's ON clause.