Cisco ATA 188 Administrator's Manual page 101

Chapter 6 Configuring and Debugging Fax Services
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:
•
•
rtpcatch works best for analyzing a single VoIP session. Command-line options can be entered in any
Note
order.
Example of rtpcatch
The section contains an example of using rtpcatch and includes an explanation of its output:
Output
C:\>rtpcatch faxpassthru -fax
[
[
[
[
[
[
[ 101]open file: 02.pcm, (G711u) 2.116:10002 => 2.213:10000
[ 106] <02>
[ 107]open file: 03.pcm, (G711u) 2.213:10000 => 2.116:10002
[ 110] <03>
------------ Summary --------------
Input file: faxpassthru.cap
<00.723>: (G723) 2.213:10000 => 2.116:10002
<01.723>: (G723) 2.116:10002 => 2.213:10000
<02.pcm>: (G711u) 2.116:10002 => 2.213:10000
Ol-3141-01
—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.
25]open file: 00.723, (G723) 2.213:10000 => 2.116:10002
26]open file: 01.723, (G723) 2.116:10002 => 2.213:10000
29] <00> 1 silence pkts from TS 1760 (seq# 3)
42] <00> 2 silence pkts from TS 4400 (seq# 9)
47] <00> 2 silence pkts from TS 5600 (seq# 11)
55] <00> 2 silence pkts from TS 7760 (seq# 15)
2 lost pkts from seq# 39
1 silence pkts from TS 19440 (seq# 41)
total 38 pkts(70 frames), lost 0 pkts, fill 7 silence pkts
total 38 pkts(76 frames), lost 0 pkts, fill 0 silence pkts
total 2181 pkts(2181 frames), lost 2 pkts, fill 0 silence pkts
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SCCP)
Debugging the Cisco ATA 186/188 Fax Services
6-13