0

Number Unobtainable

1

Address Incomplete

2

Network Termination

3

Service Unavailable

4

Sub Incompatible

5

Sub Changed Number

6

Invalid Request for Supplementary Service

7

Congestion

8

Subscriber Engaged

9

Sub Out of Service

10

Incoming Calls Barred

11

Outgoing Calls Barred

18

Remote Procedure Error

19

Service Incompatible

20

Acknowledgment

21

Signal Not Understood

26

Message Not Understood

30

NAE Error

31

No Reply from Sub

32

Service Termination

41

Access Barred

45

DTE Controlled Not Ready

46

DTE Uncontrolled Not Ready

48

Sub Call Termination

50

ET Isolated

51

Local Procedure Error