2N StarGate/BlueTower v5.3 - Manual (Page 167)

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2N TELEKOMUNIKACE a.s., www.2n.cz
®
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