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5.2 Trace
With tracing activated, the internal system messages (transmitted between processes),
messages received on and sent to the PRI / VoIP ports, 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. The right arrow (–>) means a message received on an interface
(PRI, GSM, LAN) or a message directed from a lower layer process to a higher layer
process (indication, confirmation). The left arrow (<–) designates a message sent to an
interface (PRI, GSM, LAN) or a message directed from a lower layer process to a higher
layer process (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.
ISDN Messages
Typically Used ISDN Messages (Q.931)
!alertin – Alerting
!callproc – Call proceeding
!progress – Progress
!setup – Setup
!connect – Connect
!setack – Setup acknowledge
!connack – Connect acknowledge
!disconn – Disconnect
!restart – Restart
!release – Release
!restack – Restart acknowledge
!relcompl – Release complete
!facility – Facility
!notify – Notify
!stsenq – Status enquiry
!info – Information
!status – Status