Table IV.1/Q.931 – Information element codepoints
Bits |
Recommendation |
||
8 |
7 6 5 4 3 2 1 |
||
1 |
: : : - - - - |
Single octet information elements: |
|
0 0 0 - - - - |
Reserved |
Q.931 |
|
0 0 1 - - - - |
Shift |
Q.931 |
|
0 1 0 0 0 0 0 |
More data |
Q.931 |
|
0 1 0 0 0 0 1 |
Sending complete |
Q.931 |
|
0 1 1 - - - - |
Congestion level |
Q.931 |
|
1 0 1 - - - - |
Repeat indicator |
Q.931 |
|
0 |
: : : : : : : |
Variable length information elements: |
|
0 0 0 0 0 0 0 |
Segmented message |
Q.931 |
|
0 0 0 0 1 0 0 |
Bearer capability |
Q.931 |
|
0 0 0 1 0 0 0 |
Cause |
Q.931 |
|
0 0 0 1 1 0 0 |
Connected address |
(Note 1) |
|
0 0 0 1 1 0 1 |
Extended facility |
Q.932 |
|
0 0 1 0 0 0 0 |
Call identity |
Q.931 |
|
0 0 1 0 1 0 0 |
Call state |
Q.931 |
|
0 0 1 1 0 0 0 |
Channel identification |
Q.931 |
|
0 0 1 1 0 0 1 |
Data link connection identifier |
Q.933 |
|
0 0 1 1 0 1 1 |
Coding decoding processing |
Q.931 |
|
0 0 1 1 1 0 0 |
Facility |
Q.932 |
|
0 0 1 1 1 1 0 |
Progress indicator |
Q.931 |
|
0 1 0 0 0 0 0 |
Network-specific facilities |
Q.931 |
|
0 1 0 0 1 0 0 |
Terminal capabilities |
(Note 1) |
|
0 1 0 0 1 1 1 |
Notification indicator |
Q.931 |
|
0 1 0 1 0 0 0 |
Display |
Q.931 |
|
0 1 0 1 0 0 1 |
Date/time |
Q.931 |
|
0 1 1 1 0 0 0 |
Feature activation |
Q.932 |
|
0 1 1 1 0 0 1 |
Feature indication |
Q.932 |
|
0 1 1 1 0 1 0 |
Service profile identification |
Q.932 |
|
0 1 1 1 0 1 1 |
Endpoint identifier |
Q.932 |
|
1 0 0 0 0 0 0 |
Information rate |
Q.931 |
|
1 0 0 0 0 0 1 |
Precedence level |
Q.955 (clause 3) |
|
1 0 0 0 0 1 0 |
End-to-end transit delay |
Q.931 |
|
1 0 0 0 0 1 1 |
Transit delay selection and indication |
Q.931 |
|
1 0 0 0 1 0 0 |
Packet layer binary parameters |
Q.931 |
|
1 0 0 0 1 0 1 |
Packet layer window size |
Q.931 |
|
1 0 0 0 1 1 0 |
Packet size |
Q.931 |
|
1 0 0 0 1 1 1 |
Closed user group |
Q.931 |
|
1 0 0 1 0 0 0 |
Link layer core parameters |
Q.933 |
|
1 0 0 1 0 0 1 |
Link layer protocol parameters |
Q.933 |
|
1 0 0 1 0 1 0 |
Reverse charging indication |
Q.931 |
|
1 0 0 1 1 0 0 |
Connected number |
Q.951-series [85] |
|
1 0 0 1 1 0 1 |
Connected subaddress |
Q.951 |
|
1 0 1 0 0 0 0 |
X.213 priority |
Q.933 |
|
1 0 1 0 0 0 1 |
Report type |
Q.933 |
|
1 0 1 0 0 1 1 |
Link integrity verification |
Q.933 |
|
1 0 1 0 1 1 1 |
PVC status |
Q.933 |
|
1 1 0 1 1 0 0 |
Calling party number |
Q.931 |
|
1 1 0 1 1 0 1 |
Calling party subaddress |
Q.931 |
|
1 1 1 0 0 0 0 |
Called party number |
Q.931 |
|
1 1 1 0 0 0 1 |
Called party subaddress |
Q.931 |
|
1 1 1 0 1 0 0 |
Redirecting number |
Q.931, Q.952 [86] |
|
1 1 1 0 1 1 0 |
Redirection number |
Q.952 |
|
1 1 1 1 0 0 0 |
Transit network selection |
Q.931 |
|
1 1 1 1 0 0 1 |
Restart indicator |
Q.931 |
|
1 1 1 1 1 0 0 |
Low layer compatibility |
Q.931 |
|
NOTE 1 – These codepoints are reserved to ensure backward compatibility with earlier versions of this Recommendation. NOTE 2 – All reserved values with bits 5-8 coded "0000" are for future information elements for which comprehension by the user is required (see 5.8.7.1). |
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Table IV.2/Q.931 – Message type codepoints
Bits |
Recommendation |
||
8 7 6 |
5 4 3 2 1 |
||
0 0 0 |
0 0 0 0 0 |
Escape to nationally specific message types |
Q.931 |
0 0 0 |
- - - - - |
Call establishment messages: |
|
0 0 0 0 1 |
ALERTING |
Q.931 |
|
0 0 0 1 0 |
CALL PROCEEDING |
Q.931 |
|
0 0 0 1 1 |
PROGRESS |
Q.931 |
|
0 0 1 0 1 |
SETUP |
Q.931 |
|
0 0 1 1 1 |
CONNECT |
Q.931 |
|
0 1 1 0 1 |
SETUP ACKNOWLEDGE |
Q.931 |
|
0 1 1 1 1 |
CONNECT ACKNOWLEDGE |
Q.931 |
|
0 0 1 |
- - - - - |
Call information phase messages: |
|
0 0 0 0 0 |
USER INFORMATION |
Q.931 |
|
0 0 0 0 1 |
SUSPEND REJECT |
Q.931 |
|
0 0 0 1 0 |
RESUME REJECT |
Q.931 |
|
0 0 1 0 0 |
HOLD |
Q.932 [4] |
|
0 0 1 0 1 |
SUSPEND |
Q.931 |
|
0 0 1 1 0 |
RESUME |
Q.931 |
|
0 1 0 0 0 |
HOLD ACKNOWLEDGE |
Q.932 |
|
0 1 1 0 1 |
SUSPEND ACKNOWLEDGE |
Q.931 |
|
0 1 1 1 0 |
RESUME ACKNOWLEDGE |
Q.931 |
|
1 0 0 0 0 |
HOLD REJECT |
Q.932 |
|
1 0 0 0 1 |
RETRIEVE |
Q.932 |
|
1 0 0 1 1 |
RETRIEVE ACKNOWLEDGE |
Q.932 |
|
1 0 1 1 1 |
RETRIEVE REJECT |
Q.932 |
|
0 0 1 0 1 |
DISCONNECT |
Q.931 |
|
0 0 1 1 0 |
RESTART |
Q.931 |
|
0 1 0 0 0 |
DETACH ACKNOWLEDGE |
(Note) |
|
0 1 1 0 1 |
RELEASE |
Q.931 |
|
0 1 1 1 0 |
RESTART ACKNOWLEDGE |
Q.931 |
|
1 1 0 1 0 |
RELEASE COMPLETE |
Q.931 |
|
0 0 0 1 0 |
FACILITY |
Q.932 [4] |
|
0 0 1 0 0 |
REGISTER |
Q.932 |
|
0 1 0 0 0 |
CANCEL ACKNOWLEDGE |
(Note) |
|
0 1 0 1 0 |
FACILITY ACKNOWLEDGE |
(Note) |
|
0 1 1 0 0 |
REGISTER ACKNOWLEDGE |
(Note) |
|
0 1 1 1 0 |
NOTIFY |
Q.931 |
|
1 0 0 0 0 |
CANCEL REJECT |
(Note) |
|
1 0 0 1 0 |
FACILITY REJECT |
(Note) |
|
1 0 1 0 0 |
REGISTER REJECT |
(Note) |
|
1 0 1 0 1 |
STATUS ENQUIRY |
Q.931 |
|
1 1 0 0 1 |
CONGESTION CONTROL |
Q.931 |
|
1 1 0 1 1 |
INFORMATION |
Q.931 |
|
1 1 1 0 1 |
STATUS |
Q.931 |
|
NOTE – These codepoints are reserved to ensure backward compatibility with earlier versions of this Recommendation. |
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