From the Telephony Services Spy for Win32 window, select Options > Log To File.
Windows displays the Log to File dialog box.
On the Create Trace File dialog box,
accept the default for Log Trace Messages (enabled).
In the Trace File Name field, type
a name for the trace file (for example, c:\cstatrace.txt), or, choose a location by clicking Browse.
The default extension assigned to trace files is .trc, but you can use any filename and extension.
If you would like the trace messages to be logged to a
single file that grows without bound, clear the check box for Use Multiple Trace Files and click OK.
Important
Use this option with care to avoid using excessive disk space.
If you would like to control the amount of disk space consumed
by the trace files, set the check box for Use Multiple
Trace Files. Then adjust the values for Maximum
Number of Trace Files to Create and Maximum
Size for Each Trace File based on your preferences and
click OK.