Furuno Felcom 50 Operator's Manual page 187

12C2 Call cleared, no credit card valid message received
12C3 Call failed, MES time-out (no terrestrial answer)
12C4 Call cleared, authentication query not received
12C5 Call cleared, supplementary services signalling error
12C6 Call cleared, supplementary services signalling error
12C7 Call cleared, supplementary services signalling error
12C8 Handover failed, LES not detected
12D1 Call failed, Spot-beam data invalid
12D2 Call failed, invalid scrambling vector
1351 Call cleared, insufficient free memory
1361 Call cleared by MES cable unwrap
1362 Call cleared, long interruption in reception at MES
1391 Call cleared, travelled distance exceeds 700km
1392 Call cleared, spot beam transition
1393 Call cleared, cooperative mode
1451 Call failed, terrestrial circuits congested
1452 Call failed, LES congested (no channel and no circuit)
1502 Handover, LES ready, normal clear
1551 Call failed, LES congested (no channel)
1581 Call failed, service not provided at this LES
1591 Call failed, service temporarily not available at this LES
1592 Call cleared, credit card type not supported
15A1 Call failed, MES not authorised at this LES
15A2 Call failed, service not authorised at this LES
15A3 Call cleared, credit card not authorised
15A4 Call cleared, authentication reply invalid
15A5 Call failed, PID not authorised for any service
15A6 Call failed, PID not authorised for requested service
15A7 Call cleared, dialled number illegal for Pri. 1 or 2 call
15B1 Call cleared by LES for unspecified reason
15C1 Call failed, LES time-out (no assignment)
15C2 Call failed, LES time-out (no service address)
15C3 Call failed, LES time-out (no scrambling vector)
15C4 Call failed, no service address and no scrambling vector
15C5 Call cleared, incomplete credit card data information
15C7 Call failed, LES time-out (no MES Connect)
15C9 Call cleared, no authentication reply
15CA Call cleared, notification ack not received
15CB Call cleared, invalid sequence number in notification ack
7. TROUBLESHOOTING
7-13