A320 CREW HAD TRIP CANCELED TO KEEP THE CREW FROM EXCEEDING THE MAX DUTY TIME.

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MY RESERVE DUTY BEGAN AT XA00 (ALL TIMES MST) AND I SLEPT TILL ABOUT XB30. AT XD00; I RECEIVED A CALL TO RPT AT XE00. OUR THIRD AND LAST LEG OF THE DAY WAS PHX-DEN; BUT LOW VISIBILITY CAUSED OUR EVENTUAL DIVERSION TO COS. WE ARRIVED AT XM16. I CALLED CREW SCHEDULING FROM OPS AND WAS ASKED TO CALL BACK IN 20 MINS FOR FURTHER INSTRUCTIONS. SHORTLY AFTER XN00; I CALLED SCHEDULING; BUT RECEIVED ONLY BUSY SIGNALS. I MADE SEVERAL ATTEMPTS; REDIALING DURING EACH. DURING THESE ATTEMPTS; A FLT RELEASE FOR OUR ACFT BEGAN PRINTING. THIS WAS FOR A COS-PHX EXTRA-SECTION DEPARTING AT XO00. BECAUSE THIS RELEASE PRINTED; I STOPPED TRYING TO CONTACT SCHEDULING. FUELING AND MANUAL WT AND BAL COMPUTATION DELAYED OUR DEP. MY DISCUSSIONS OF DUTY TIME LIMITS WITH THE FO FOCUSED ONLY ON OUR RPT TIMES -- HIS XD40; MINE XE00. I WAS UNAWARE THAT MY XA00 RESERVE DUTY WAS THE LIMITING FACTOR. I PHONED DISPATCH AND OBTAINED AN AMENDMENT TO OUR RELEASE TO EXTEND IT BEYOND THE 1 HR LIMIT. WE FINALLY PUSHED AT XP20 AND ARRIVED IN PHX AT XR05 (RELEASE TIME XR20). SUBSEQUENTLY; I LEARNED THAT MY FAR DUTY TIME AT XA00 AND WAS LIMITED TO 16 HRS. I ALSO LEARNED THAT SCHEDULING AND DISPATCH CANCELED MY FLT AT ROUGHLY XO30 BECAUSE OF DUTY LIMITS. (AS YET; THERE IS NO EXPLANATION FOR THE FACT THAT WE WERE NOT NOTIFIED OF THIS CANCELLATION.) I HAD NOT HELD RESERVE DUTY FOR SEVERAL YRS. MY CARRIER HAS PUBLISHED NO INFO ON CHANGES IN DUTY TIME LIMITATIONS. FOR THESE REASONS; I WAS UNAWARE OF RECENT DEVELOPMENTS IN THE INTERP OF FAR 121.471 PERTAINING TO RESERVE DUTY LIMITS. TO CORRECT THIS SIT; MY CARRIER HAS GIVEN ME 'SPECIAL PURPOSE' TRAINING ON THIS FAR.