MGM TWR CTLR EXPRESSED CONCERN REGARDING THE RELIABILITY OF THE EMER PHONE EQUIP.

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I WAS WORKING ALL TOWER FUNCTIONS COMBINED WHEN I WAS ADVISED OF AN INBOUND MEDICAL EMERGENCY DIVERTING INTO MGM. I PICKED UP THE RED 'CRASH PHONE' WHICH IS SUPPOSED TO BE ANSWERED BY THE AIRPORT FIRE DEPARTMENT AND AIRPORT POLICE AND ALSO BE MONITORED BY SEVERAL OTHER ENTITIES ON THE FIELD. ONLY THE AIRPORT POLICE ANSWERED AND I RELAYED THE INFORMATION ON THE INBOUND EMERGENCY. I THEN HUNG UP THE CRASH PHONE AND PICKED UP THE COMMERCIAL TELEPHONE AND DIALED THE NUMBER FOR THE AIRPORT FIRE DEPARTMENT AND ASKED IF THEY WERE AWARE OF THE EMERGENCY. THEY WERE NOT. I REPEATED THE INFORMATION FOR THEM AND THEY INITIATED THEIR RESPONSE. THE 'CRASH PHONE' SYSTEM PROVIDED BY THE AIRPORT IS APPARENTLY NOT VERY RELIABLE. FROM MY VANTAGE POINT; IT APPEARS THAT IF ONE ENTITY (POLICE) ANSWERS THE PHONE; THEN IT STOPS RINGING AT THE OTHER LOCATION (FIRE); SIMILAR TO THE BEDROOM PHONE STOPPING WHEN SOMEONE PICKS UP THE EXTENSION IN THE KITCHEN. THIS HAS HAPPENED BEFORE. LUCKILY; WE USUALLY HAVE A LOT OF LEAD TIME TO NOTIFY THEM OF AN INBOUND EMERGENCY; SO WE CAN WORK AROUND THE POORLY DESIGNED EMERGENCY SYSTEM. AN ACTUAL ON-AIRPORT ACCIDENT WOULD NOT OFFER THIS LEAD TIME.