
Chapter 7 Configuring and Debugging Fax Services
Debugging the Cisco ATA 186/188 Fax Services
–<cap_file> is the NAI Sniffer capture file.
–<prefix> is the prefix prepended to the output filenames.
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
Options
rtpcatch options include:
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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.
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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
Note rtpcatch works best for analyzing a single VoIP session.
Example of rtpcatch
The section contains an example of using rtpcatch and includes an explanation of its output:
Output
| C:\>rtpcatch | faxpassthru |
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[ | 25]open file: 00.723, (G723) 2.213:10000 => | 2.116:10002 |
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[ | 26]open file: 01.723, (G723) 2.116:10002 => | 2.213:10000 |
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[ | 29] | <00> | 1 | silence pkts from | TS 1760 (seq# | 3) |
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[ | 42] | <00> | 2 | silence pkts from | TS 4400 (seq# | 9) |
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[ | 47] | <00> | 2 | silence pkts from | TS 5600 (seq# | 11) |
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[ | 55] | <00> | 2 | silence pkts from | TS 7760 (seq# | 15) |
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[ | 101]open file: 02.pcm, (G711u) | 2.116:10002 => 2.213:10000 |
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[ | 106] | <02> | 2 | lost pkts from | seq# 39 |
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[ | 107]open file: 03.pcm, (G711u) | 2.213:10000 => 2.116:10002 |
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[ | 110] | <03> | 1 | silence pkts from | TS 19440 (seq# 41) | |||||
Summary |
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| Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP) |
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