As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAN MAKE OUTGOING CALLS ON SATCOM. BUT INCOMING SATCOM VOICE CALLS FROM DISPATCH WERE UNSUCCESSFUL. RECEIVED NO INDICATIONS ON HF/SAT SELECT PANEL. NO CHIME, NO LIGHT SAT MENU ON MCDU ALSO SHOWED NO INDICATION OF INCOMING CALL. DISPATCH TRIED 4 TIMES. GROUNDED - YES. CDOULD NOT DUPLICATE. OPS CHECK GOOD REF B737-900 AMM 23-15-00. GROUND VERIFICATION SUCCESSFUL.