A LOW ALT ARTCC RADAR CTLR IN TRAINING ISSUED A XING RESTR AT 11000 FT TO AN E145 ACR ACFT. THE PLT READ BACK 10000 FT INSTEAD RESULTING IN THE ACFT ENTERING ADJACENT FACILITY AIRSPACE AT THE WRONG ALT.

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I WAS TRAINING ON ONE OF MY FIRST TWO RADAR SECTORS; NO RADAR ASSOCIATE. ADJACENT MOA AND WARNING AREAS ACTIVE; I WAS CTLING A MIL CAP OVER BOSTON WHICH OVERLAPPED 3 OTHER SECTORS. ALSO IN CTL OF THE ASSOCIATED REFUELING TRACK 2000 FT ABOVE MY SECTOR IN 2 HIGH SECTORS' AIRSPACE. TANKER CLBING TO THE ARR TRACK; DEP OUT OF PORTLAND; TWO INBOUNDS TO PORTLAND ON N SIDE OF SECTOR; 1 INBOUND TO PWN ON S SIDE OF SECTOR OVERFLYING THE MIL CAP. THE FIRST NORTHERLY INBOUND HAD BEEN ISSUED XING RESTR PER LOA BY PREVIOUS SECTOR TO CROSS NEETS INTXN AT 11000 FT; THE DATA BLOCK REFLECTED INTERIM ALT 11000 FT ASSIGNED. I WAS DISCUSSING THE CAP/REFUELING TRACK SITUATION WHEN THE ACFT CHKED ON. I DIDN'T HEAR IT CLRLY SO I ASKED THE ACFT TO SAY AGAIN. THE PLT CHKED ON AGAIN; HOWEVER; STATED 'NEETS AT TEN.' THE CALL SIGN ALSO ENDED WITH TEN. I THOUGHT THAT I HEARD THE APPROPRIATE RESTR AND GAVE THE PORTLAND ALTIMETER. THE FLT WAS STILL IN THE DSCNT PRIOR TO NEETS AND I INITIATED THE AUTOMATED HDOF TO PORTLAND APCH. THE HDOF WAS ACCEPTED AND I FREQ CHANGED THE ACFT JUST PRIOR TO REACHING NEETS THE ACFT CONTINUED DSCNT TO 10000 FT AND VIOLATED BOS APCH AIRSPACE. BOS APCH CONTACTED PORTLAND APCH ABOUT THE ACFT; THEN CONTACTED MY OPS SUPVR TO SEE IF I HAD ASSIGNED 10000 FT. I HAD NOT; AND THOUGHT THE FLT HAD STATED THE APPROPRIATE RESTR; WHICH HAD BEEN GIVEN AND READ BACK CORRECTLY WITH THE APPROPRIATE SECTOR. BASICALLY I HAD HEARD WHAT I EXPECTED TO HEAR GIVEN THE LOA AND DATA BLOCK INFO AND DID NOT HEAR THE INCORRECT ALT. I HAD BEEN DISTR BY THE UNUSUAL MIL OP WITH AIRSPACE OUTSIDE THE NORMAL LIMITS OF THE SECTOR AND PERCEIVED THE CORRECT RESTR ON INITIAL CONTACT. THE LESSON: DON'T HEAR -- LISTEN.