CONFUSION CONCERNING DEP RWY AT MMU; NJ; BETWEEN A LIGHT TWIN ATP PLT AND AN N90 DEP CTLR.

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ON THE EVENING OF SEP/XA/01; I WAS PREPARING TO DEPART MMU ON AN IFR FLT PLAN TO ISP AT APPROX XA45. THE TWR HAD CLOSED AND DUE TO THE CURRENT FLT RESTRS AT THIS TIME REGARDING OPS IN AND AROUND NEW YORK CLASS B AIRSPACE; I WAS ADVISED THAT I MUST OBTAIN A CLRNC FROM NEW YORK APCH FROM A LAND PHONE; WITH A CLRNC VOID TIME. I DID SO; AND ADVISED THE CTLR THAT I NEEDED 15-20 MINS TO GET BACK TO THE PLANE AND MAKE THAT DEP FROM RWY 23. THE CTLR ADVISED ME THAT WAS TOO LONG AND COULD I POSSIBLY MAKE IT OFF ANY QUICKER. I ADVISED HIM THAT I COULD GET OFF IN 10 MINS USING RWY 5. THIS WAS ACCEPTABLE AND I WAS THEN GIVEN A CLRNC. NO MENTION OF RWY THEY EXPECTED ME TO USE WAS GIVEN IN THE CLRNC; AND AS THE MMU 4 DEP IS FLYABLE OFF RWY 5; AND RWY 23; I UNDERSTOOD THAT A DEP OF RWY 5 WAS IMPLIED TO COMPLY WITH THEIR 10 MIN 'TO BE AIRBORNE' REQUIREMENT. I WAS AIRBORNE OFF RWY 5 WITHIN THE ALLOTTED TIME; MAKING ALL CORRECT TA'S; THERE WAS NO TFC IN THE IMMEDIATE AREA OR ON THE FREQ. I CONTACTED DEP AT 300 FT OFF THE DEP END OF RWY 5 HOLDING RWY HDG (THE PROC REQUIRES RWY HDG TO BE HELD TO 1700 FT); ONLY TO BE ADMONISHED BY THE CTLR FOR NOT FOLLOWING THE DEP HE HAD GIVEN ME. IN THE FOLLOWING EXCHANGE IT BECAME CLR TO ME THAT THE CTLR HAD NOT GIVEN ME A COMPLETE ENOUGH CLRNC (HE OMITTED TO CLARIFY THE RWY HE WANTED ME TO USE); AND THAT I WAS FLYING THE CORRECT PROC FOR THE INFO I WAS GIVEN. THERE WAS NO OTHER TFC IN THE AREA AND NO CONFLICTS OCCURRED. THE REMAINDER OF THE FLT TO ISP WAS UNEVENTFUL.