Item

Q.931 cause

Code

Q.931diagnostic

X.25 cause

Code

X.25 diagnostic

Code

01

Unallocated (unassigned) number

001

Condition: unknown, transient, permanent

Not obtainable

13

Invalid called address

67

02

No route to destination

003

Condition: unknown, transient, permanent

Not obtainable

13

Invalid called address

67

03

Channel unacceptable

006

(None)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

04

Normal call clearing

016

Condition: unknown, transient, permanent

DTE originated

00

No additional information

00

05

User busy

017

(None)

Number busy

01

No logical channel available

71

06

No user responding

018

(None)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

07

User alerting, no answer

019

(None)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

08

Call rejected

021

Condition: unknown, transient, permanent + user applied diagnostics

DTE originated

00

No additional information

00

09

Number changed

022

New destination address

Not obtainable

13

Invalid called address

67

10

Destination out of order

027

(None)

Out of order

09

No additional information

00

11

Invalid number format (incomplete number)

028

(None)

Local procedure error

19

Invalid called address

67

12

Normal, unspecified

031

(None)

DTE originated

00

No additional information

00

13

No circuit/channel available

034

(None)

Number busy

01

No logical channel available

71

14

Network out of order

038

(None)

Out of order

09

No additional information

00

15

Temporary failure

041

(None)

Out of order

09

No additional information

00

16

Switching equipment congestion

042

Network identity

Network congestion

05

No additional information

00

17

Requested circuit/channel available

044

(None)

Number busy

01

No logical channel available

71

18

Resources unavailable, unspecified

047

(None)

Network congestion

05

No additional information

00

19

Quality of service unavailable

049

Condition: unknown, transient, permanent

Network congestion

05

No additional information

00

20

Bearer capability not authorized

057

Attribute number

Incompatible destination

33

No additional information

00

21

Bearer capability not presently available

058

Attribute number

Remote procedure error

17

Call set-up, call clearing or registration problem

64

22

Service or option not available, unspecified

063

(None)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

23

Bearer service not implemented

065

Attribute numbers

Incompatible destination

33

No additional information

00

24

Channel type not implemented

066

Channel type

Remote procedure error

17

Call set-up, call clearing or registration problem

64

25

Service or option not implemented, unspecified

079

(None)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

26

Valid call reference value

081

(None)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

27

Identified channel does not exist

082

Channel identity

Remote procedure error

17

Call set-up, call clearing or registration problem

64

28

Incompatible destination

088

Incompatible parameter

Incompatible destination

33

No additional information

00

29

Invalid message, unspecified

095

(None)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

30

Mandatory information element is missing

096

Information element identifier(s)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

31

Message type non-existent or not implemented

097

Message type

Remote procedure error

17

Call set-up, call clearing or registration problem

64

32

Message not compatible with call state or message type non-existent or not implemented

098

Message type

Remote procedure error

17

Call set-up, call clearing or registration problem

64

33

Information element non-existent or not implemented

099

Information element identifier(s)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

34

Invalid information element contents

100

Information element identifier(s)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

35

Message not compatible with call state

101

Message type

Remote procedure error

17

Call set-up, call clearing or registration problem

64

36

Recovery on timer expiry

102

Timer number

Remote procedure error

17

Call set-up, call clearing or registration problem

64

37

Protocol error, unspecified

111

(None)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

38

Interworking, unspecified

127

(None)

Remote procedure error

17

Call set-up, call clearing or registration problem

64

NOTES

1. When clearing occurs during the X.25 data transfer phase, the procedure described in 6.4.1 should be used.

2. When a Q.931 RESTART message is received during the X.25 data transfer phase, switched virtual circuits shall be cleared with a clear indication packet containing cause No. 9, Out of order, with diagnostic No. 0, no additional information. Permanent virtual circuits shall have an X.25 reset packet sent with the same cause and diagnostic.