What was found
SATCOM 1 AND 2 XMIT INOP WON'T TRANSMIT VOICE. SATCOM CALL CAN BE MADE, CONNECTS, BUT VOICE TRANSMISSIONS WON'T GO THROUGH TRIED SAT 1 AND SAT 2 TO DISPATCH AND MEDLINK FOR BOTH CAP AND FO ACP PANELS ALL WITH SAME RESULTS. GROUNDED - YES. PERFORMED SATCOM COMMUNICATION SYSTEM TEST PER B737-900 AMM 23-15-00 OPS CHECK GOOD . OK FOR SVC PERFORMED A SAT COM CALL TO DISPATCH SUCCESSFUL TWO WAY COMMUNICATION WAS ESTABLISHED CLEAR COMS FROM BOTH SIDES NO DEFECTS NOTED AT THIS TIME.