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Call Trace Tool

Call Trace Overview

The graphical call trace application traces calls (or message sequences)

across all links and groups the messages together. It is therefore a very

powerful facility for troubleshooting, particularly since it operates in both

real- time and post- capture modes.

The application produces a user- configurable window which contains one

line for each call. For example in the case of ISUP, this window would

typically show:

• Call identifier

• Call status

• Call duration

• Call setup time

• Call cleardown time

• Called party number

• Calling party number

• OPC/DPC/CIC

• Release cause

• Graphical representation of call phases

GPRS Session Trace Tool

The GPRS session trace is the equivalent of a call trace application for

the GPRS Gb interface. It captures and groups the signaling messages for

user sessions such as PDP context and GPRS attach/detach procedures.

The type of information displayed in the summary view is typically:

• Session status (active/terminated)

• Session type (attach/PDP)

• Session ID number/status

• Related GMM ID number

• IMSI/TLLF

• IMEI

• Location Area Code/Routing Area Code/Cell identifier

• Setup Time/Session Duration

• Source IP address (PDP contexts only)

• Uplink/Downlink packet and octet counts (PDP contexts only)

• Reject reason (PDP contexts only)

Group Function

From the call trace overview window, it is very easy to display all the

signaling messages related to a specific call or sequence -- simply double

click on it. Alternatively, it is possible to click on any message in the

traffic overview and use the group function to display all the messages

associated with it (i.e., messages in the same call or sequence). Figure 9

shows a typical call trace overview.

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