2N PRI Gateways - User Manual - Manual (Page 96)

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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