MEM CTLR EXPRESSED CONCERN REGARDING THE OPERABILITY OF THE ARPT EMER 'CRASH' PHONE SYS.

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I WAS WORKING THE GND CTL #2 (GC2) POS THIS MORNING WHEN THE CTLR IN CHARGE (CIC) PERFORMED THE DAILY CRASH PHONE CHK. THE TELEPHONE PORTION OF THE CHK WITH MEM ARFF WAS 'LOUD AND CLR;' HOWEVER THE SPEAKER PORTION THAT BROADCASTS INSIDE THE MEM ARFF FIRE STATION WAS 'WEAK AND BARELY READABLE' AS RPTED BY THE ARFF RESPONDING INDIVIDUAL. THIS EQUIP ISSUE HAS BEEN AN ONGOING PROB. RECENTLY IT WAS DETERMINED THAT THE SPEAKER VOLUME INSIDE THE ARFF FIRE STATION WAS ACTUALLY TURNED DOWN; AND THIS WAS A PARTIAL CONTRIBUTING FACTOR TO PREVIOUS RPTS CONCERNING THIS MATTER. THE ETVS DIRECT LINE TO MEM ARFF IS STILL OTS. AT XA10 THE SUPVR CAME ON DUTY IN THE TWR CAB. THE SUPVR THEN CONTACTED THE MEM POLICE VIA DIRECT LINE ON THE ETVS SYS AND REQUESTED TO BE PATCHED THROUGH TO MEM OPS BECAUSE OPS COULD NOT BE REACHED THROUGH THE DIRECT DIAL SYS OF OUR ETVS SYS. THE MEM POLICE CONNECTED THE SUPVR TO A LCL SANDWICH SHOP. MEM CONTINUES TO HAVE NUMEROUS EQUIP ISSUES THAT INVOLVE TWR BEING ABLE TO CONTACT ARFF AND OPS.