As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM VOICE CALLS INOPERATIVE. UNABLE TO TALK OUT ON ACTIVE SATCOM CHANNEL WHEN CALL IS CONNECTED. TRIED BOTH SATCOM 1/2 CHANNELS TO MEDLINK AS WELL AS DISPATCH, COULD HEAR THE CALLED PARTY FINE BUT PARTY COULD NOT HEAR TRANSMISSIONS. ACFT GROUNDED. ESTABLISHED CLEAR 2 WAY VOICE COMMUNICATIONS ON SATCOM 1 & 2. GROUND VERIFICATION SUCCESSFUL IAW AMM 23-15-00/501.