Complex case statement in Calculated Attribute of Analytic View

Hi,

I am trying to add a complex case statement in Calculated Attribute of Analytic View but unable to add logical operands like "AND" and "OR".

CASE((CALL_TYPE = 2 AND CFLAG2 !=IN('I','i','n')OR CALL_TYPE =IN(15,17)),(RING_TIME + QUEUE_TIME + DELAY_TIME + CTYPE_TIME + HOLD_TIME + TALK_TIME),

0)

Could somebody tell me how to implement this in a calculated attribute of Analytic view?

Thanks.