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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)
OL-3410-01
Chapter7 Configuring and De bugging Fax Services
Debugging the Cisco ATA 186/188 Fax Services
Using prserv for Diagnosing Fax Problems
This section contains the following topics:
•prserv Overview, page 7-9
•Analyzing prserv Output for Fax Sessions, page 7-9

prserv Overview

prserv is a tool that runs on a Microsoft Windows-based PC and serves as a log server that captures
debug information that the Cisco ATA sends to your PC IP address/port. The debug information is saved
into a readable text file.
To enable your Cisco ATA to send debug information, you need to set the NPrintf configuration
parameter to your PC IP address and an available port, as shown in the following procedure:
Procedure
Step 1 <IP address>.<port>
<IP address> is the IP address of your PC.
<port> is any unused port (any number from 1024 to 65535) on your PC.
Note You can the Nprintf parameter on the Cisco ATA configuration web page or with the TFTP-based
configuration method.
Step 2 To operate the debug capture program prserv.exe, place the prserv program in a folder on your PC. At
the DOS prompt, enter:
C:>prserv <port>
<port> is the port number you have selected. If <port> is omi tted, the default port number is 9001.
As prserv receives debug information from the Cisco ATA, it displays the information on the DOS screen
and saves it to the output file <port>.log.
Once you are finished capturing debug information, you can stop prserv by entering Ctrl -C at the DOS
prompt. If you restart the process without changing the name of the log file, any new debug information
is appended to the end of the original file.

Analyzing prserv Output for Fax Sessions

The debug log obtained from prserv is for detecting simple configuration problems.
Note A comprehensive understanding of the fax events requires the use of the rtpcatch tool (see the “Using
rtpcatch for Diagnosing Fax Problems” section on page 7-12).
Table 7 -2 lists log events relevant to analyzing a fax session.