CORP PLT UNABLE TO MAKE XING RESTRICTION DURING DSCNT INTO ICT BECAUSE DSCNT CLRNC ISSUED LATE AND PAX HAD EAR PROBLEM DUE TO RAPID RATE OF DSCNT.

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ENRTE TO ICT AT FL200; ATC ISSUED THE FOLLOWING CLRNC AT APPROX 75 NE OF ICT. 'CROSS 40 NE OF ICT VOR AT AND MAINTAIN 6000 FT.' I ACCEPTED THE CLRNC AND STARTED ON IMMEDIATE DSCNT. DSNDING THROUGH 150; 1 PAX COMPLAINED OF EAR PROBLEMS AND I FOUND MYSELF IN A SITUATION OF BEING UNABLE TO MAINTAIN A COMFORTABLE DSCNT RATE AND ALSO COMPLY WITH THE XING RESTRICTION. THE PAX WAS IN OBVIOUS PAIN SO I CALLED ATC TWICE TO INFORM THEM THAT I WOULD BE UNABLE TO COMPLY WITH THE XING RESTRICTION. ON THE SECOND RADIO CALL ATC ACKNOWLEDGED MY XMISSION AND HANDED ME OFF TO ANOTHER CTLR. I AM NOT SURE AT THIS TIME WHETHER OR NOT THE ATC CTLR UNDERSTOOD MY XMISSION OR NOT BECAUSE OF THE IMMEDIATE HDOF; AND I DID NOT WANT TO DELAY CHANGING TO THE NEXT CTLR BECAUSE IF THERE WAS A POSSIBLE TFC CONFLICT I WAS ASSUMING IT WAS IN THE NEXT CTLRS AIRSPACE. LOOKING BACK I SHOULD NOT HAVE ACCEPTED THE XING RESTRICTION THAT REQUIRED ABNORMAL DSCNT RATES (FOR PAXS) AND DO WISH I COULD HAVE HAD EARLIER WARNING OF THE XING RESTRICTION. APPARENTLY THIS XING RESTRICTION IS LCL IN NATURE (NOT PUBLISHED) AND SHOULD BE MADE KNOWN TO THOSE FLYING A LITTLE EARLIER IN THE FLT.