CORP LTT BUSTED SID RESTRICTION AT KARYN INTERSECTION ON THE POMONA 1 SID OFF ONTARIO. ATC CAUGHT DEVIATION.

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WE RECEIVED THE FOLLOWING CLRNC FROM CLRNC DELIVERY: 'CLRED TO MKE ARPT; POMONA #1 SID; DAGGETT TRANSITION; MAINTAIN 12000'; EXPECT 33000' 10 MINS AFTER...ETC.' OUR TAXI AND TKOF WERE NORMAL. AFTER TKOF; WE WERE INSTRUCTED TO CALL ONT DEP CTL. AFTER CHKING IN WITH ONT DEP CTL; THE CTLR TOLD US TO: 'CLB TO 12000' AND COMPLY WITH ALL CLB REQUIREMENTS.' I ACKNOWLEDGED; 'ROGER; CLB TO 12000' LTT X.' I DID NOT READ BACK 'AND COMPLY WITH ALL CLB REQUIREMENTS' BECAUSE I THOUGHT THAT THIS PORTION OF THE CLRNC WAS AN ADVISORY RELATING TO ACFT PERFORMANCE. SINCE I WAS IN THE RIGHT SEAT OPERATING RADIOS AND DOING THE NAV; I LOOKED AT THE POMONA 1 SID AND READ THE CLB GRADIENT SECTION TO MYSELF. THE PLT IN THE LEFT SEAT SAID; 'WHAT DO WE DO?' I TOLD HIM THAT AS LONG AS BOTH ENGS KEEP RUNNING; HE WILL MEET THE CLB REQUIREMENTS OF THE SID. SINCE THE DEP CTLR SAID NOTHING CONCERNING ANY XING RESTRICTION AT KARYN INTXN; AND HE TOLD US TO 'CLB TO 12000'.' I ASSUMED THAT THE XING RESTRICTION AT KARYN INTXN WAS WAIVERED; IN OTHER WORDS; AN UNRESTRICTED CLB TO 12000'. IN THE VICINITY OF THE POMONA VOR; WE WERE INSTRUCTED TO CONTACT LA CENTER. AFTER CHKING IN WITH LA CENTER; THE CTLR ASKED US FOR OUR ALT. WE TOLD HIM WE WERE CLBING OUT OF 8100'. HE THEN PROCEEDED TO TELL US THAT WE WERE CLRED TO CROSS KARYN INTXN AT OR BELOW 7000' AND THEN CLRED TO CLB TO 12000'. WE TOLD HIM THAT WE RECEIVED NO SUCH CLRNC 'TO CROSS KARYN INTXN AT OR BELOW 7000'.' I TOLD HIM THE ONLY CLRNC WE GOT WAS; 'CLB TO 12000';' AND THAT WAS THE ONLY THING I READ BACK. WE STOPPED THE CLB AND STARTED BACK DOWN TO 7000'. WITHIN SECS AFTER STARTING A DSCNT TO 7000'; WE REALIZED WE HAD JUST PASSED KARYN INTXN. THEN WE PROCEEDED TO STOP THE DSCNT AT 7700' AND RESTART THE CLB TO 12000'. THE CTLR THEN GAVE ME A TELEPHONE NUMBER FOR LA CENTER. I WAS INSTRUCTED TO CALL THIS NUMBER AND ASK FOR A TEAM SUPVR. I DID SO AT THE END OF THE FLT. I CALLED THE LA CENTER AND TALKED TO A SUPVR AND EXPLAINED OUR ACTIONS TO HIM. I EXPLAINED THAT I DID NOT GET A CLRNC TO CROSS KARYN INTXN AT OR BELOW 7000'; AND I DID NOT READ BACK ANY SUCH CLRNC. I TOLD THE SUPVR THAT THE ONLY CLRNC I GOT FROM THE DEP CTLR WAS; 'CLB TO 12000' AND COMPLY WITH ALL CLB REQUIREMENTS.' I TOLD THE SUPVR THAT I ACKNOWLEDGED; 'ROGER; CLB TO 12000' LTT X.' I DID NOT READ BACK; 'AND COMPLY WITH ALL CLB REQUIREMENTS;' BECAUSE I THOUGHT THAT THIS PORTION OF THE CLRNC WAS AN ADVISORY RELATING TO ACFT PERFORMANCE. THE SUPVR THEN SAID THAT THE POMONA 1 SID ALSO SAYS TO CROSS KARYN INTXN AT OR BELOW 7000'; 'WHICH YOU DIDN'T.' I AGREED THAT THE SID STATES THAT KARYN INTXN HAS A XING RESTRICTION OF 7000'. I THEN TOLD THE SUPVR THAT IT IS MY UNDERSTANDING THAT THE CLRNC I GOT IN THE AIR FROM THE DEP CTLR ('CLB TO 12000' AND COMPLY WITH ALL CLB REQUIREMENTS') SUPERSEDED THE SID XING RESTRICTION IN THE CLRNC I GOT FROM CLRNC DELIVERY. I TOLD THE SUPVR THAT IT IS MY UNDERSTANDING THAT THE 'CLB TO 12000'' PORTION OF THE CLRNC FROM DEP CTL WAS A WAIVER OF THE XING RESTRICTION AT KARYN INTXN. IF THE ONT DEP CTLR WANTED US TO MEET THE XING RESTRICTION AT KARYN INTXN; HE SHOULD HAVE SAID; 1) 'CLB TO 12000' AND COMPLY WITH ALL XING RESTRICTIONS ON THE SID;' OR 2) 'AFTER YOU COMPLY WITH THE XING RESTRICTION ON THE SID; CLB TO 12000'.' THE LA CENTER CTLR SAID THAT WE WERE SPECIFICALLY INSTRUCTED TO CROSS KARYN INTXN AT OR BELOW 7000' BY THE ONT DEP CTLR. IF THIS IS TRUE; THEN THE ONLY THING I CAN SAY IS THAT WE DID NOT HEAR THAT PORTION OF THE CLRNC AND I DID NOT READ THAT BACK. THE ONLY THING I READ BACK WAS; 'ROGER; CLB TO 12000' LTT X.' OBVIOUSLY WE HAD A PROB IN COMS. MY REPLY WAS NOT ENOUGH. THE DEP CTLR SHOULD HAVE REISSUED THE CLRNC WITH THE XING RESTRICTION; AND HE SHOULD HAVE ASKED ME TO READ BACK THAT PORTION OF THE CLRNC THAT WOULD HAVE PERTAINED TO XING KARYN INTXN AT OR BELOW 7000'. ANOTHER PROB THAT IS OFTEN OVERLOOKED; BUT IS JUST AS IMPORTANT IS THE LIMITATIONS OF OUR COM RADIOS. EXAMPLE: LET'S SAY THAT A CTLR IS GIVING A CLRNC TO ONE ACFT. AT THE SAME TIME; ANOTHER ACFT COMES ON THE SAME FREQ; AND HE IMMEDIATELY KEYS HIS MIC. THE PLT OF THE FIRST ACFT CAN MISS IMPORTANT PARTS OF A CLRNC AND NOT REALIZE IT. THIS IS ANOTHER POSSIBILITY OF WHAT COULD HAVE HAPPENED IN THIS CASE; I DON'T KNOW. THE ONE CONCLUSION I KEEP COMING BACK TO IS MAKE SURE THE PLT READS BACK ALL VITAL PARTS OF THE CLRNC. SUPPLEMENTAL INFO FROM ACN 84111: ALTHOUGH THERE WAS NO CONFLICT WITH OTHER ACFT; AND THE ALARM DID NOT SOUND AT CENTER; I THINK WE DID HAVE A LACK OF COM WITH GND PERSONNEL. MY BELIEF WHILE FLYING WAS THAT WE HAD AN UNRESTRICTED CLB TO 12000'. I BELIEVE THE PROB AROSE BECAUSE OF A FAILURE TO READ BACK ALL CLRNCS (IF HEARD); AND ALSO BECAUSE OF RUSHING TO MAKE A TKOF SLOT TIME. I ALSO BELIEVE THAT THE NOISE LEVEL AND PLT WORKLOAD MAY HAVE CONTRIBUTED TO THIS INCIDENT.