DISPATCHER REPORTS B767-300 ARRIVAL AT SBGR FAILED TO REPORT ARRIVAL TIMES. NUMEROUS ATTEMPTS TO CONTACT APPROPRIATE AGENCIES WERE UNSUCCESSFUL FOR AN EXTENDED PERIOD. FEELS SINGLE POINT CONTACT INFORMATION FROM OUTLYING STATIONS TO/FROM DISPATCH SHOULD BE REQUIRED FOR LATE/DELAYED FLTS.

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THIS FLT DID NOT AUTOMATICALLY RPT ITS ON/IN TIME. I TRIED MAKING SEVERAL CALLS TO GRU OPS AND ALSO SENT DATALINK MESSAGES TO GRUOO; GRUDD; AND GRUCSUA AND TO FIND OUT IF IN FACT THE ACFT HAD LANDED SAFELY. 50 MINS AFTER THE FLT WAS SCHEDULED TO LAND; I WAS UNABLE TO CONTACT ANYONE -- EVEN THE GRU TWR. I HAD ENLISTED THE HELP OF OPB AS WELL. THERE WERE A FEW FACTORS FOR THIS PROB. THERE WAS NO ONE AVAILABLE AT GRU FOR DISPATCH TO CONTACT WHILE FLTS WERE OPERATING INTO GRU. MANY OF THE NUMBERS IN THE ARPT DATABASE I DIALED EITHER ENDED WITH A QUICK BUSY SIGNAL OR JUST CONNECTED ME TO AN OPERATOR. I FINALLY GOT HOLD OF SOMEONE (ON OPS CELL WHO WAS ACTUALLY IN THE UNITED STATES) WHO CONTACTED SOMEONE WHO THEN CALLED ME BACK. I CAN'T FIND THE FAR FOR REF; (NTSB 830); BUT AN EMER SHOULD HAVE BEEN DECLARED FOR THIS FLT. PLEASE INSURE THAT DISPATCH HAS A SINGLE SOURCE 24-HR CONTACT NUMBER FOR ITS OPS. IF WE HAVE UNSCHEDULED; LATE OPERATING; OR IRREGULAR FLTS OPERATING WE NEED SOME ONE AT EACH OF OUR STATIONS TO CALL US WITH A CONTACT NUMBER IF THE REGULAR OPS NUMBER IS NOT GOING TO BE MONITORED.