ISDN clear code

Explanation

1

Unallocated number

2

No route to transit network

3

No route to destination

16

Normal call clearing

17

Subscriber busy

18

No user responding

19

No answer from user

21

Call rejected

22

Number changed

27

Destination out of order

28

Invalid number format

31

Normal, unspecified

34

No circuit/channel available

38

Network out of order

41

Temporary failure

42

Switching equipment congestion

47

Resources unavailable

111

Protocol error