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12.2. Abbreviations in Tracing
12.2.1. Identification of Channels and Processes
With tracing activated, internal system messages (transmitted between processes), messages
received on and sent to the PRI port, and AT commands and replies sent to GSM modules are
written out. The listing of a message related to a specific call starts with the B-channel and GSM
module numbers and an arrow showing the message direction. A right arrow ( ) means a
message received on the interface (PRI, GSM, LAN) or a message directed from the process of
a lower layer to the process of a higher layer (indication, confirmation). A left arrow ( )
designates a message sent to the interface (PRI, GSM, LAN) or a message directed from the
process of a lower layer to the process of a lower layer (request, response). The message type
(layer 3 messages are shifted by a space to the right, layer 4 messages by two spaces to the
right) and the message content follow.
12.2.2. ISDN Messages
Typically Used ISDN Messages (Q.931)
ID
Name
Whole Name
ID
Name
Whole Name
000h
!alertin
Alerting
04Dh !release
Release
001h
!callproc
Call proceeding
04Eh !restack
Restart acknowledge
002h
!progress
Progress
05Ah !relcompl Release complete
003h
!setup
Setup
062h !facility
Facility
005h
!connect
Connect
06Eh !notify
Notify
007h
!setack
Setup acknowledge
075h !stsenq
Status enquiry
00Dh
!connack
Connect acknowledge 07Bh !info
Information
00Fh
!disconn
Disconnect
07Dh !status
Status
046h
!restart
Restart
Typically Used ISDN Elements (Q.931)
ID
Name Whole Name
ID
Nam
e
Whole Name
004h
BEA
Bearer capability
04Ch CTN Connected party number
008h
CAU
Cause
04Dh CTS Connected party subaddress
010h
CID
Call identity
06Ch CGN Calling party number
014h
CST
Call state
06Dh CGS Calling party subaddress
018h
CHA
Channel identification 070h
CDN Called party number
01Ch
FAC
Facility
071h
CDS Called party subaddress
01Eh
PRG
Progress indicator
079h
RST Restart indicator
020h
NTW
Network-spec facility 07Ch LCO Low layer compatibility
027h
NOT
Notification indicator
07Dh HCO High layer compatibility
028h
DSP
Display
07Eh
USR User-user
029h
DAT
Date/time
07Fh
ESC Escape for extension
02Ch
KEY
Keypad facility
0A1h
SEC Sending complete
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