FLC OF AN LGT ACR ACFT STOPPED ASSIGNED DSCNT IN RESPONSE TO A TCASII RA.

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MILWAUKEE APCH CTL GAVE US CLRNC TO DSND TO 7000 FT (WE WERE EBOUND FOR VISUAL APCH TO RWY 19R). WE ACKNOWLEDGED CLRNC WITH READBACK AND THEN FO SET ACFT WT INDICATOR TO 7000 FT. I ACKNOWLEDGED 7000 FT AND THEN STARTED DSCNT. AFTER LEVEL OFF AT 7000 FT WE NOTICED OPPOSITE DIRECTION TFC ON TCASII 100 FT BELOW AND APPROX 3 MI TO THE S. WE CALLED APCH AND THEY SAID (YES) TFC SHOWING 6900 FT WBOUND. WE STILL DID NOT HAVE THE OTHER ACFT VISUALLY. APCH NEXT GAVE US A DSCNT TO 6000 FT. I BEGAN A RAPID DSCNT TO 6000 FT. ALMOST IMMEDIATELY (6900 FT) TCASII GAVE US AN RA 'CLB; CLB; CLB.' I THEN INITIATED A CLB AND DIRECTED THE FO TO TELL APCH OUR INTENTIONS TO CLB. AT THE SAME INSTANT WE SAW THE ACFT VISUALLY AND RECEIVED A TCASII 'CLR OF CONFLICT;' AND RESUMED OUR DSCNT TO 6000 FT. ON THE GND I CALLED APCH BY TELEPHONE TO DISCUSS WBOUND TFC AT 7000 FT; SUPVR SAID WE WERE AT THE WRONG ALT; BUT UPON DISCUSSION WITH HIS CTLRS; AND THE FACT THAT NO SEPARATION LIMITS WERE BROKEN -- THEY WERE NOT GOING TO PURSUE ACTION. APPARENTLY APCH WAS NOT LISTENING TO OUR CLRNC READBACK; BECAUSE THE WHOLE CREW HEARD AND ACKNOWLEDGED AND THE FO SET 7000 FT IN THE AWI. ON DEP FROM MILWAUKEE A SHORT TIME LATER; WE WERE GIVEN CLB CLRNC; AND BEFORE THE CAPT HAD FINISHED THE READBACK; DEP WAS ALREADY TALKING TO ANOTHER ACFT. THE 2-WAY COM SAFETY VALVE IN MILWAUKEE IS NOT WORKING. YOU MUST ALSO LISTEN TO CLRNC READBACKS AS WELL AS GIVE THEM.