B737 INITIATES EVASIVE MANEUVER DUE TO TCASII RA FOR NON ISSUED TFC WHILE BEING VECTORED TO THE BHM ILS RWY 23 FINAL APCH COURSE.

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WE INTERCEPTED ILS RWY 23 LOC AT 12 MI WITH A DSCNT CLRNC FROM 5000 FT TO 3000 FT. AT 3950 FT; APCH DIRECTED US TO STOP AT 4000 FT. I STOPPED THE DSCNT AND RETURNED TO 4000 FT. A SUPVR CAME ON THE FREQ AND DIRECTED A TURN TO 180 DEGS AND REQUESTED AN EXPEDITED DSCNT TO 2300 FT. I INITIATED THE TURN; THEN RECEIVED A TCASII RA TO CLB REF TFC SHOWING '00' ALT DIFFERENCE WITHIN THE 2 MI CIRCLE OF THE TCASII DISPLAY. DUE TO THE CONFLICTING DIRECTIONS FROM THE CTLR AND THE TCASII; I RESPONDED AGGRESSIVELY TO THE TCASII RA. WE WERE THEN RESEQUENCED FOR THE APCH AND LANDED. THE TCASII HAD BEEN SHOWING THE CONFLICTING TARGET BUT WE NEVER RECEIVED A TCASII TA PRIOR TO THE TCASII RA. THE INITIAL CTLR NEVER POINTED OUT THE CONFLICTING TFC TO US BUT HAD BEEN SPENDING A LOT OF TIME AND XMISSIONS DIRECTING HIM. WITH THE ONSET OF THE TCASII RA AND THE SENSE OF URGENCY IN THE SUPVR'S VOICE; I FELT A NEED TO RESPOND MORE AGGRESSIVELY THAN WAS COMFORTABLE FOR THE PAX AND CABIN CREW. I AM STILL SURPRISED AT HOW QUICKLY THE SIT SEEMED TO DETERIORATE GIVEN THE INFO AVAILABLE AND ATTN BEING PAID BY MYSELF AND THE FO.