AT Commands Modem Terminated 184
3 No Loop Current
10-19 Transmit Phase A & miscellaneous errors
10 Unspecified Phase A error
11 No Answer (T.30 T1 Timeout)
20-39 Transmit Phase B Hang-up Codes
20 Unspecified Transmit Phase B error
21 Remote cannot receive or send
22 COMREC error in transmit Phase B
23 COMREC invalid command received
24 RSPEC error
25 DCS sent three times without response
26 DIS/DTC received 3 times, DCS not recognized
27 Failure to train at 2400 bits/s or +FMINSP
28 RSPREC invalid response received
40-49 Transmit Phase C Hang-up Codes
40 Unspecified Transmit Phase D error
43 TE to TAE data underflow
50-69 Transmit Phase D Hang-up Codes
50 Unspecified Transmit Phase D error
51 RSPREC error
52 No response to MPS repeated 3 times
53 Invalid response to MPS
54 No response to EOP repeated 3 times
55 Invalid response to EOP
56 No response to EOM repeated 3 times
57 Invalid response to EOM
58 Unable to continue after PIN or PIP
70-89 Receive Phase B Hang-up Codes
70 Unspecified Receive Phase B error
71 RSPREC error
72 COMREC error
73 T.30 T2 time out, expected page not received
74 T.30 T1 time out after EOM received
90-99 Receive Phase C Hang-up Codes
90 Unspecified Receive Phase C error
91 Missing EOL after 5 seconds
93 TAE to TE buffer overflow
94 Bas CRC or frame (ECM or BFT modes)
100-119 Receive Phase D Hang-up Codes
100 Unspecified receive Phase D error
101 RSPREC invalid response received
102 COMREC invalid response received
103 Unable to continue after PIN or PIP