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Q933 + Annex A
Q933 Message structure: fields
| - Octet 1: |
mandatory |
| bits 8-1 |
Protocol discriminator (08 H) |
| - Octet 2: |
mandatory |
| bits 8-5 |
0000 |
| bits 4-1 |
Length of call reference value (1 or 2 octets) |
| - Octet 3: |
mandatory |
| bit 8 |
Call reference flag
set to 0 if the message is sent from the side that originates the
call reference
set to 1 if the message is sent to the side that originates the
call reference. |
| bits 7-1 |
Call reference value, assigned by the originating side of the interface
for a call. |
| - Octet 4: |
exists only if octet 2 = 00000010 |
| bits 8-1 |
Call reference value (Low order octet) |
| - Octet: |
mandatory |
| bit 8 |
0 |
| bits 7-1 |
Message type |
| - Octets: |
optional |
| bits 8-1 |
One or several information element(s) |
Q933 Message structure: list of types
| bits 8 _ _ _ _ _ _ 1 |
hex |
Message type |
| 0 0 0 _ _ _ _ _ |
|
Call establishment messages |
| 0 0 0 0 1 |
01 |
ALERTING |
| 0 0 0 1 0 |
02 |
CALL PROCEEDING |
| 0 0 1 1 1 |
07 |
CONNECT |
| 0 1 1 1 1 |
0F |
CONNECT ACKNOWLEDGE |
| 0 0 0 1 1 |
03 |
PROGRESS |
| 0 0 1 0 1 |
05 |
SETUP |
| 0 1 0 _ _ _ _ _ |
|
Call clearing messages |
| 0 0 1 0 1 |
45 |
DISCONNECT |
| 0 1 1 0 1 |
4D |
RELEASE |
| 1 1 0 1 0 |
5A |
RELEASE COMPLETE |
| 0 1 1 _ _ _ _ _ |
|
Miscellaneous messages |
| 0 0 0 0 0 |
60 |
SEGMENT |
| 1 1 1 0 1 |
7D |
STATUS |
| 1 0 1 0 1 |
75 |
STATUS ENQUIRY |
Q933 Message structure: list of IE
The code values of the information element identifier (first octet of the IE)
for the variable length formats are assigned in ascending numerical order,
according to the actual order of appearance of each IE in a message. Single
octet IE may appear at any point in the message.
Information Element Codeset 0
| bits 8 _ _ _ _ _ _ 1 |
hex |
Single octet IE |
| 1 0 0 1 _ _ _ _ |
9_ |
Shift |
| 1 0 1 _ _ _ _ |
D_ |
Repeat Indicator |
| bits 8 _ _ _ _ _ _ 1 |
hex |
Variable length IE |
| 0 0 0 0 0 0 0 0 |
00 |
Segmented Message |
| 0 0 0 0 1 0 0 |
04 |
Bearer Capability |
| 0 0 0 1 0 0 0 |
08 |
Cause |
| 0 0 1 0 1 0 0 |
14 |
Call State |
| 0 0 1 1 0 0 0 |
18 |
Channel Identification |
| 0 0 1 1 0 0 1 |
19 |
Data Link Connection Identifier |
| 0 0 1 1 1 1 0 |
1E |
Progress Indicator |
| 0 1 0 0 0 0 0 |
20 |
Network Specific Facilities |
| 0 1 0 1 0 0 0 |
28 |
Display |
| 1 0 0 0 0 1 0 |
42 |
End-to-end Transit Delay |
| 1 0 0 0 1 0 0 |
44 |
Packet Layer Binary Parameters |
| 1 0 0 1 0 0 0 |
48 |
Link layer Core Parameters |
| 1 0 0 1 0 0 1 |
49 |
Link layer Protocol Parameters |
| 1 0 0 1 1 0 0 |
4C |
Connected Number |
| 1 0 0 1 1 0 1 |
4D |
Connected Subaddress |
| 1 0 1 0 0 0 0 |
50 |
X213 Priority |
| 1 0 1 0 0 0 1 |
51 |
Report Type |
| 1 0 1 0 0 1 1 |
53 |
Link Integrity Verification |
| 1 0 1 0 1 1 1 |
57 |
PVC Status |
| 1 1 0 1 1 0 0 |
6C |
Calling Party Number |
| 1 1 0 1 1 0 1 |
6D |
Calling Party Subaddress |
| 1 1 1 0 0 0 0 |
70 |
Called Party Number |
| 1 1 1 0 0 0 1 |
71 |
Called Party Subaddress |
| 1 1 1 1 0 0 0 |
78 |
Transit Network Selection |
| 1 1 1 1 1 0 0 |
7C |
Low-Layer Compatility |
| 1 1 1 1 1 0 1 |
7D |
High Layer Compatibility |
| 1 1 1 1 1 1 0 |
7E |
User-User |
| 1 1 1 1 1 1 1 |
7F |
Escape for extension |
Q933 Annex A message structure: fields
| - Octet 1: |
mandatory |
| bits 8-1 |
Protocol discriminator (08 H) |
| - Octet 2: |
mandatory |
| bits 8-1 |
00000000 = dummy call reference |
| - Octet 3: |
mandatory |
| bit 8 |
0 |
| bits 7-1 |
Message type (Status Enquiry or Status) |
| - Octets: |
mandatory |
| bits 8-1 |
Report type IE |
| - Octet: |
optional |
| bits 8-1 |
One or several other IE’s (Link Integrity Verification or PVC status) |
Q933 Annex A parameters: number list
| N391 |
|
| Description |
Every N391 polling cycles ,full status (status of all PVCs) is
requested. |
| Value |
1-255, 6 by default. |
| N392 |
|
| Description |
Number of errors during N393 monitored events which cause the
channel/user side procedures to be declare inactive. Can be used to test
the network side procedures. |
| Value |
1-10, 3 by default. |
| N393 |
|
| Description |
Amount of monitored events (Status Enquiry message or T392 expiration)
to be used in relation with N392. |
| Value |
1-10, 4 by default. |
Q933 Annex A parameters: time-limit list
| T391 |
|
| Description |
Link integrity verification polling timer.
Started on transmission of Status Enquiry message. |
| Value |
5-30s, 10s by default. |
| T392 |
|
| Description |
Timer for verification of polling cycle.
Started on transmission of Status message.
Stopped on reception of Status Enquiry message. |
| Value |
5-30s, 10s by default. |
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