EMS HELI FLT LEAVING MEDICAL CTR TO REFUEL. TWR CLRS DIRECT AND HELI FLIES INTO PROHIBITED AIRSPACE. TWR QUESTIONS WHY HE IS NOT ON RTE.

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ON A MEDICAL FLT FROM ABC TO XYZ MEDICAL CTR; AFTER DROPPING OFF THE PATIENT AT XYZ MEDICAL CTR FLYING TO XYZ ARPT FOR REFUEL I WAS INFORMED THAT I HAD FLOWN INTO RESTR AIRSPACE. WHEN I LIFTED OFF MEDICAL CTR I RADIOED XYZ TWR AND ASKED FOR ALFA/BRAVO INTXN FOR THE FBO FOR FUEL. TWR CLRED ME TO RWY 21 AND TAXI TO ALPHA/BRAVO INTXN. I DEPARTED ON HEADING APPROX 240 DEGS TO GO IN BTWN RESTR AIRSPACES AND THEN TO RWY 21. WHEN I WAS IN BTWN THE RESTR AIRSPACES TWR CALLED AND ASKED WHERE I WAS. A FEW MINS LATER TWR SAID TO TURN AND PROCEED TO RWY 18 AND FLY DOWN RWY 18 TO ALPHA/BRAVO INTXN AND TO CONTACT TWR AFTER LNDG. WHEN I CALLED THE TWR I WAS TOLD ABOUT INFRINGING THE RESTR AIRSPACE AND THAT SOMEONE WOULD BE CONTACTING ME ABOUT IT. I WAS ALSO ASKED WHY I WAS NOT ON A DIFFERENT RTE. I TOLD THEM THAT I WAS NOT THE LCL EMS HELI BUT ANOTHER HELI FROM OUT OF THE AREA AND UNFAMILIAR WITH THAT. AT NO TIME DID I INTENTIONALLY FLY INTO THAT AIRSPACE IF IN FACT I DID. I USED MY REGULAR CALL SIGN WHICH TWR SHOULD HAVE KNOWN I WAS NOT LCL EMS. ALSO IF THEY HAVE RADAR COULDN'T TWR TELL ME I WAS NEARING THAT AREA?