Analyzing Rtpcatch Output For Fax Sessions - Cisco ATA186-I1 Administrator's Manual

Debugging the Cisco ATA 186/188 Fax Services

Analyzing rtpcatch Output for Fax Sessions

The following examples show the proper fax events when gateways are configured to operate in the
following modes:
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•
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Example 6-1
---------- FAX Summary 1 ----------
[
[
Analysis
Both sides use G.711 for the entire fax session.
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for SCCP (version 3.0)
6-16
PATH: 2.116:10002 => 2.213:10000
[ 26]Codec G723
[ 101]Codec G711u/D
[ 102]NSE PT 100, EVT 192: Up-Speed, CED tone Detected
[ 103]NSE PT 100, EVT 193: ECAN OFF, Phase Reversal Detected
This summarizes the fax events for each path.
The audio stream events reported by rtpcatch include:
beginning of new audio codec
–
silence packets
–
lost packets
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erased packets (as in G.729)
–
The NSE events reported by rtpcatch include:
– event 32, Fax Mode, CED tone Detected (RFC2833)
– event 34, Modem Mode, ANSam tone Detected (RFC2833)
– event 192, Up-Speed, CED tone Detected
event 193, ECAN OFF, Phase Reversal Detected
–
event 194, ECAN ON, Silence Detected
–
event 200, T38 Fax Mode, V.21 Detected
–
event 201, T38 Fax Mode ACK
–
event 202, T38 Fax Mode NACK
–
event 203, Modem Relay Mode, CM Tone Detected
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event Cisco Fax Relay (with RTP payload type 96)
–
event Cisco Fax Relay ACK (with RTP payload type 97)
–
Cisco ATA fax mode
Cisco ATA fax pass-through mode
T.38 fax relay mode
Cisco fax relay mode
Fax Mode
25]<2.131=>3.200> Codec G711u
26]<3.200=>2.131> Codec G711u
Chapter 6 Configuring and Debugging Fax Services
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