Multi-Tech Systems MTCBA-G-F2 - Manual (Page 49)

Troubleshooting
49
Interpretation of Extended Error Codes
related to “no carrier” message
Error Code Diagnostic Hint
1 Unallocated
phone number Not allocated
16 Normal call
clearing
17 User busy
18 No user
responding
19 User alerting, no
answer
21 Call rejected
22 Number changed
31 Normal,
unspecified