Welltech Dialogic SS7 Protocols ISUP - Manual (Page 166)

Section 8 Non-Primitive Interface
166
8.22 Trace Event Indication
The ISUP module may be configured to trace to management most primitives
issued or received. This is useful for debug purposes. The ISUP event masks
are used to enable and disable tracing on a per primitive basis for each link.
The traced primitives are reported as event indications as shown below:
Message Header
structure MSG
type MGT_MSG_TRACE_EV (0x0003)
id 0
src ISUP module id
dst trace module id
rsp_req 0x00
hclass 0x00
status 0x00
err_info 0x00
len 18 + length of traced data
Parameter Area
offset 0, size 1 source module id
offset 1, size 1 destination module id
offset 2, size 2 id
offset 4, size 2 type
offset 6, size 2 status
offset 8, size 4 timestamp
offset 12, size 4 pointer to the message being traced
offset 16, size 2 data length
parameters
offset 18, size 0..280 contents of the MSG parameter area