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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 (
Æ
) 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 (
Å
)
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)
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)
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