GULFSTREAM G100 CREW IMPROPERLY DSNDED FROM 4000 FT TOWARD 2000 FT FOR APCH TO TEB.

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WHILE ENRTE FROM ABE (LEHIGH VALLEY INTL) TO TEB (TETERBORO; NJ). JUST AFTER PASSING THE STW (STILLWATER) VOR ON VECTORS AT ASSIGNED ALT OF 4000 FT FOR THE ILS RWY 6 AT TETERBORO; THE PNF RECEIVED INSTRUCTIONS FROM THE APCH CTLR TO FLY HEADING 130 DEGS. SHORTLY AFTER WE RECEIVED INSTRUCTIONS FROM THE CTLR TO DSND AND MAINTAIN 2000 FT; PNF ACKNOWLEDGED; LEAVING 4000 FT FOR 2000 FT WITH OUR CALL SIGN AND WE BEGAN DSNDING TO 2000 FT. AFTER HEARING ANOTHER ACFT ON THE SAME FREQ WITH A VERY SIMILAR CALL SIGN THE PNF ASKED THE CTLR TO CONFIRM OUR ASSIGNED ALT. HIS RESPONSE WAS 4000 FT. WE ADVISED THE CTLR WE WERE ASSIGNED 2000 FT. AT THIS TIME WE WERE INSTRUCTED TO CLB AND MAINTAIN 3000 FT. WE RECEIVED STANDARD VECTORS TO THE ILS RWY 6; LANDED RWY 6 AT TEB WITHOUT FURTHER INCIDENT. THIS EVENT TOOK PLACE IN VMC AND NO OTHER ACFT WERE INVOLVED. THE CTLR WAS VERY BUSY HANDLING SEVERAL ACFT; ANOTHER ACFT ON THE FREQ WITH THE SAME LAST 2 REGISTRATION LETTERS; WERE ALL FACTORS LEADING TO MISCOMS BTWN THE CTLR AND THE PLTS. IN THE PAST; AND; USUALLY WHEN ANOTHER ACFT WITH SIMILAR N NUMBERS ARE ON THE SAME FREQ THE CTLR WILL SAY; 'PLEASE BE ADVISED ANOTHER ACFT WITH A SIMILAR N NUMBER IS ON THE FREQ PLEASE LISTEN UP.' I BELIEVE THIS IS GOOD PRACTICE AND ALL CTLRS AND PLTS SHOULD BE REMINDED TO DO SO. THIS WILL GREATLY HELP AVOID MISCOMS BTWN PLTS AND CTLRS.