What was found
ATTEMPTED TO CONTACT DISPATCH DESK A ON BOTH SAT 1 & 2 INBD. TO ANC, ALL PANEL INDICATIONS & CDU SEEMED NORMAL, SHOWED CALL AS RINGING & THEN ANSWERED, BUT NO AUDIO WAS AVAILABLE IN EITHER THE CAPTAIN'S OR FO'S HEADSET. GROUNDED - YES. PERFORMED SATCOM POWER RESET PER FIM TASK 23-15 TASK 801.PERFORMED SATCOM TEST PER AMM TASK 23-15-00. OPS CHECK GOOD - NO DEFECTS NOTED.DISPATCH A WAS CALLED. HAD CLEAR COMMUNICATION.