WITH T1 (T11

    , T22

    , T33

    , T44) AS

    (SELECT TASKID

         , REPLY

         , ROWNUMBER () OVER (PARTITION BY TASKID)

         , ROWNUMBER () OVER (PARTITION BY TASKID) AS T4

     FROM RT_CALLTASKRECDT)

    , T3 (S1

    , S2

    , S3

    , S4) AS

    (SELECT T11

         , CAST (T22 AS VARCHAR (100))

         , T33

         , T44

     FROM T1

     WHERE T33 = 1 AND T44 = 1 UNION ALL

    SELECT A.S1

        , CAST (A.S2 || ',' || B.T22 AS VARCHAR (100))

        , A.S3 + 1

        , A.S4

    FROM T3 A

        , T1 B

    WHERE A.S1 = B.T11 AND A.S3 = B.T44 - 1)

SELECT S1

    , S2

FROM T3 X

WHERE X.S3 = (SELECT MAX (S3)

              FROM T3 Y

              WHERE X.S1 = Y.S1);