Cisco ATA186-I1 Administrator's Manual page 123

Chapter 6 Configuring and Debugging Fax Services
Major functions
rtpcatch includes the following major functions:
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How to Use
To use rtpcatch, follow these steps:
Procedure
Step 1 Create a working directory for rtpcatch and place the executable file rtpcatch.exe in this directory.
Step 2 Copy your Network Associates Sniffer Pro capture files into this directory.
At the DOS prompt of this directory, enter the following command:
Step 3
:>rtpcatch <cap_file> [<prefix>] [options]
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Output Files
The output files of rtpcatch include a summary file and audio stream files.
The summary file is <prefix>.sum if <prefix> is specified, otherwise it is file.sum.
Stream files are labeled with an integer tag beginning with 00. Stream files are also tagged with the
extension pcm for G.711A/G.711µ-law, 723 for G723.1, 729 for G729, t38 for T.38, and cfr for Cisco
Fax Relay.
Options
rtpcatch options include:
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OL-4652-01
Reads session data from Sniffer Pro capture files.
Analyzes media streams.
Stores media streams to files.
Reports RTP statistics such as the number of RTP packets, the number of RTP frames, the number
of lost packets, the number of filler packets during silence suppression periods, and the number of
erased packets.
<cap_file> is the NAI Sniffer capture file.
<prefix> is the prefix prepended to the output filenames.
—to output the fax events for a connection.
-fax
The output includes "FAX summary 1" as the interleaved event list for all directions, and "FAX
summary 2" as the event list for each direction. The reported events include voice codec change,
NSE signalling, and fax relay events.
—to discard any packets sent from/to this port.
-port <port0> <port1>
If the NAI Sniffer capture file includes Cisco ATA prserv packets, these packets can interfere with
rtpcatch analysis. Some prserv packets might be interpreted as NTE or NSE events. To prevent
such interference, you can either disable debugging output on the Cisco ATA (do this by setting the
Nprintf configuration parameter to 0), configure your NAI Sniffer to filter out the prserv packets,
or run rtpcatch with the -port options.
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for SCCP (version 3.0)
Debugging the Cisco ATA 186/188 Fax Services
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